JP2021145333A - Broad band antenna - Google Patents

Abstract

To provide a broad band antenna capable of increasing a radiant gain.SOLUTION: A broad band antenna 10A comprises: an imbalanced feeding material 11 having a power supply part 20 and a non-power supply part 21; a resonance conductor 12 resonated with the power supply part 20 of the imbalanced feeding material 11; a ground conductor 13 resonated with the non-power supply part 21 of the imbalanced feeding material 11; and a fixing conductor 14 positioned between the resonance conductor 12 and the ground conductor 13 to be connected to the imbalanced feeding material 11. The resonance conductor 12 is formed by: a first resonance conductive part 22a extended in an axial front direction from the fixing conductor 14 in parallel to the power supply part 20; and a second resonance conductive part 22b extended in the axial front direction from the fixing conductor 14 in parallel to the power supply part 20. The ground conductor 13 is formed by: a first ground conductive part 25a extended in an axial rear direction from the fixing conductor 14 in parallel to the non-power supply part 21; and a second ground conductive part 25b extended in the axial rear direction from the fixing conductor 14 in parallel to the non-power supply part 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wideband antenna including an unbalanced feeding material, a resonance conductor, and a ground conductor.

An unbalanced feeding material having a feeding portion having a predetermined length and a non-feeding portion having a predetermined length connected to the feeding portion, a dielectric substrate having a predetermined dielectric constant, and an unbalanced plate formed into a plate having a predetermined area. An antenna having a resonance conductor that resonates with the feeding part of the feeding material and a ground conductor that is molded into a plate shape having a predetermined area and integrated with the resonance conductor and resonates with the non-feeding part of the unbalanced feeding material. It is disclosed (see Patent Document 1).

The resonance conductor of this antenna is separated outward in the radial direction of the unbalanced feeding material, and is unbalanced with the first resonance conductor portion extending axially forward of the unbalanced feeding material in parallel with the feeding portion. It is located on the opposite side of the first resonance conductor part with the material in between, and is separated from the unbalanced feeding material radially outward and from the second resonance conductor part extending axially forward in parallel with the feeding part. It is formed. The ground conductor of the antenna is connected to the fixed portion electrically connected to the unbalanced feeding material via the fixing means, and is connected to the fixed portion to be separated outward in the radial direction of the unbalanced feeding material, and is also a non-feeding portion. In parallel, the first gland conductor that extends rearward in the axial direction of the unbalanced feeding material and the unbalanced feeding material are located on the opposite side of the first gland conductor with the unbalanced feeding material in between, and are connected to the fixed part of the unbalanced feeding material. It is formed from a second ground conductor portion that is separated outward in the radial direction and extends rearward in the axial direction in parallel with the non-feeding portion. In the antenna, the first and second resonance conductor portions of the resonance conductor are joined to one surface of the dielectric substrate, and the fixed portion of the ground conductor and the first and second ground conductor portions are the first and first. 2 The conductor portion for resonance is joined to the same surface as one surface of the bonded dielectric substrate.

JP 2012-238944

In the antenna disclosed in Patent Document 1, a dielectric substrate having a predetermined dielectric constant functions as a capacitance, so that the first and second resonance conductor portions and the feeding portion bonded to the dielectric substrate are connected to each other. While easily resonating, the first and second ground conductor portions bonded to the dielectric substrate and the non-feeding portion easily resonate, and a plurality of resonance frequencies can be obtained, and a plurality of obtained resonance frequencies can be obtained. Since the resonance frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap, the specific band of the antenna can be greatly widened.

In recent years, the importance of antennas has increased due to improvements in communication technology, and antennas are required to have a high radiation gain as well as a wide band. Although the antenna disclosed in Patent Document 1 has a wide specific band, it cannot increase the radiation gain, and it is possible to send radio waves far away (increase the radiation gain) while maintaining a predetermined electric field strength. difficult. In addition, if an obstacle made of a conductor such as metal is close to or exists in the vicinity of the antenna when transmitting and receiving radio waves, the resonance point of the antenna may fluctuate due to the obstacle, and the frequency band of the antenna may change. It may not be possible to send and receive radio waves in the band, the conversion efficiency for converting high-frequency current into radio waves is reduced, and it may not be possible to send and receive radio waves in the frequency band as designed.

An object of the present invention is to have a wide band of specific bands, to be able to transmit and receive radio waves in a wide band, to have a high radiation gain, and to send radio waves far away while maintaining a predetermined electric field strength (increasing the radiation gain). ) Is to provide a wideband antenna that can be used. Another object of the present invention is that even if an obstacle made of a conductor such as metal is close or present in the vicinity, the resonance point of the antenna does not fluctuate, the frequency band of the antenna does not change, and a high-frequency current is transmitted. It is an object of the present invention to provide a wideband antenna capable of maintaining the conversion efficiency of converting to and transmitting and receiving radio waves in the frequency band as designed.

The broadband antenna of the present invention for solving the above problems is incompatible with an unbalanced feeding material having a feeding portion having a predetermined length and a non-feeding portion having a predetermined length connected to the feeding portion and extending axially rearward from the feeding portion. A means for fixing to the unbalanced feeding material, which is located between the resonance conductor that resonates with the feeding part of the balanced feeding material, the ground conductor that resonates with the non-feeding part of the unbalanced feeding material, and the resonance conductor and the ground conductor. It is provided with a fixing conductor electrically connected via a wire, and the resonance conductor is separated radially outward of the unbalanced feeding material and extends axially forward from the fixing conductor in parallel with the feeding portion. It is located on the opposite side of the first resonance conductor part and the first resonance conductor part with the unbalanced feeding material in between, and is separated radially outward of the unbalanced feeding material, and is separated from the fixing conductor in parallel with the feeding part. It is formed from a second resonance conductor portion that extends forward in the axial direction, and the ground conductor is separated radially outward of the unbalanced feeding material and extends axially rearward from the fixing conductor in parallel with the non-feeding portion. It is located on the opposite side of the first ground conductor and the unbalanced feeding material with the unbalanced feeding material in between, and is separated outward in the radial direction of the unbalanced feeding material, and is separated from the fixing conductor in parallel with the non-feeding part. It is characterized in that it is formed from a second ground conductor portion extending rearward in the axial direction.

As an example of the present invention, the broadband antenna has a first non-feeding element located between the first ground conductor portion and the second ground conductor portion, and the first non-feeding element is fixed to the unbalanced feeding material. It is located between the first non-feeding fixed portion electrically connected via means, the unbalanced feeding material and the first ground conductor portion, and is separated outward in the radial direction of the unbalanced feeding material and is the first. The first non-feeding conductor portion extending axially forward from the first non-feeding fixed portion, the unbalanced feeding material, and the second ground conductor portion while being separated inward in the radial direction of the ground conductor portion. Located between and, while separating the unbalanced feeding material radially outward and inward in the radial direction of the second ground conductor portion, the shaft from the first non-feeding fixed portion is parallel to the non-feeding portion. It is formed from a second non-feeding conductor portion extending forward in the direction.

As another example of the present invention, the first resonance conductor portion and the second resonance conductor portion of the resonance conductor are in a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material, and the first conductor for ground is used. The ground conductor portion and the second ground conductor portion are in a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material, and the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are , There is a line symmetry with respect to the central axis of the unbalanced feeding material.

As another example of the present invention, in the broadband antenna, the axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are λ / 8 to λ / 16.

As another example of the present invention, the broadband antenna is located between the first ground conductor portion and the second ground conductor portion and is axially forward of the first non-feeding element and faces the first non-feeding element. The second non-feeding element is provided, and the second non-feeding element is electrically connected to the unbalanced feeding material via a fixing means, and the unbalanced feeding material and the first ground conductor. It is located between the parts and the unbalanced feeding material, and while separating outward in the radial direction and inward in the radial direction of the first ground conductor part, from the second non-feeding fixed part in parallel with the non-feeding part. It is located between the third non-feeding conductor portion extending rearward in the axial direction and the unbalanced feeding material and the second ground conductor portion, and is separated outward in the radial direction of the unbalanced feeding material and the diameter of the second ground conductor portion. It is formed from a fourth non-feeding conductor portion extending axially rearward from the second non-feeding fixed portion in parallel with the non-feeding portion while being separated inward in the direction.

As another example of the present invention, the third non-feeding conductor portion and the fourth non-feeding conductor portion of the second non-feeding element have a line symmetric relationship with respect to the central axis of the unbalanced feeding material, and the broadband antenna. Then, the axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are λ / 8 to λ / 16, and the third non-feeding conductor portion of the second non-feeding element. The axial length of the fourth passive conductor portion is λ / 8 to λ / 16.

As another example of the present invention, the first non-feeding conductor portion of the first non-feeding element and the third non-feeding conductor portion of the second non-feeding element have one of the conductor portions facing up. With the other side facing down, the wideband antennas are lined up so as to be separated from each other in the thickness direction, and the second non-feeding conductor portion of the first non-feeding element and the fourth non-feeding conductor portion of the second non-feeding element are arranged. One of the conductors is on the top and the other is on the bottom, and they are lined up so as to be separated from each other in the thickness direction of the wideband antenna.

As another example of the present invention, the front end of the first non-feeding conductor portion of the first non-feeding element is slightly separated and opposed to the rear end in the axial direction from the rear end of the third non-feeding conductor portion of the second non-feeding element. The front end of the second non-feeding conductor portion of the first non-feeding element is slightly separated and opposed to the rear end in the axial direction from the rear end of the fourth non-feeding conductor portion of the second non-feeding element.

As another example of the present invention, the broadband antenna has a feeding element that is formed into a plate shape having a predetermined area and is located axially forward of the resonance conductor, and the feeding element is electrically connected to the feeding portion. The diameter of the power supply fixing portion, the first feeding conductor portion having a predetermined area extending radially outward from the feeding fixing portion and located axially forward from the first resonance conductor portion of the resonance conductor, and the feeding feeding fixing portion. It has a second feeding conductor portion having a predetermined area extending outward in the direction and located forward in the axial direction from the second resonance conductor portion of the resonance conductor.

As another example of the present invention, the first feeding conductor portion is formed with a plurality of first stepped portions arranged in a stepped manner from the rear end to the front end of the first feeding conductor portion, and the second feeding conductor portion is formed. , A plurality of second stepped portions arranged in a staircase pattern from the rear end to the front end of the second feeding conductor portion are formed.

As another example of the present invention, the first feeding conductor portion and the second feeding conductor portion of the feeding element have a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material.

As another example of the present invention, the unbalanced feeding material covers the first conductor extending in the axial direction, the insulator covering the outer peripheral surface of the first conductor, and the outer peripheral surface of the insulator in the axial direction. The feeding portion of the unbalanced feeding material is formed from the first conductor, and the non-feeding portion of the unbalanced feeding material is formed from the first and second conductors and the insulator. The fixing conductor is electrically connected to the second conductor, and the feeding element is electrically connected to the first conductor.

According to the broadband antenna according to the present invention, a high-frequency current is induced in the first and second resonant conductors and the feeding portion, and a high-frequency current flows in the axial direction between the first and second resonant conductors and the feeding portion. A high-frequency current is induced in the first and second ground conductors and the non-feeding portion, and a high-frequency current flows in the axial direction between the first and second ground conductors and the non-feeding portion, and the first and second resonant conductors And the feeding part resonate with the axial high-frequency current induced in the conductor part and the feeding part, and the first and second ground conductor parts and the non-feeding part are induced in the conductor part and the non-feeding part. It is possible to obtain a plurality of resonance frequencies by resonating with a high-frequency current in the axial direction, and the obtained plurality of resonance frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap. Not only can the specific band (about 100 MHz to about 10.0 GHz) of the antenna be significantly widened, but also high-frequency current is induced in the first and second ground conductors to induce axial currents in the first and second ground conductors. A high-frequency current flows to one side, and a high-frequency current is induced in the first and second non-feeding conductor portions extending in the axial direction of the first non-feeding element, and a high-frequency current flows to the other axial direction of the first and second non-feeding conductor portions. The high-frequency current that flows in one axial direction of the first ground conductor and the high-frequency current that flows in the other axial direction of the first non-feeding conductor cancel each other out, and the high-frequency current that flows in one axial direction of the second ground conductor and the first 2 Axial direction of the non-feeding conductor The unnecessary current is canceled by canceling the high-frequency current flowing to the other side, and the radiation gain in the antenna is improved. A strong electromagnetic field is generated, and an antenna having a high radiation gain can be obtained, and a wide band radio wave can be sent over a wide range and far away (increasing the radiation gain) while maintaining a predetermined electric current strength. A wideband antenna can be used to make an antenna having a high radiation gain with VSWR (voltage standing wave ratio) of 2 or more and 3 or less, and all of the specific bands (frequency bands used) in which it can be used. It is possible to make an antenna capable of transmitting and receiving radio waves in a wide band (broadband) and capable of transmitting and receiving a wide band radio wave with only one antenna.

The first resonance conductor portion and the second resonance conductor portion of the resonance conductor have a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material, and the first ground conductor portion and the second ground conductor portion of the ground conductor Is in a line symmetric relationship with respect to the central axis of the unbalanced feeding material, and the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are lined with respect to the central axis of the unbalanced feeding material. In a wideband antenna having a symmetric relationship, the first and second resonant conductors having a linear symmetry with respect to the central axis of the unbalanced feeding material have the same electrolytic strength, and the feeding portion and the feeding portion have a plurality of resonance frequencies. It easily resonates, and the first and second ground conductors, which are line-symmetrical with respect to the central axis of the unbalanced feeding material, have the same electrolytic strength and easily interact with the non-feeding part at multiple resonance frequencies. It is possible to resonate and obtain a plurality of resonance frequencies, and since the obtained plurality of resonance frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap, the specific band in the antenna (about 100 MHz to about 100 MHz). Not only can it be greatly expanded (about 10.0 GHz), but high-frequency currents are induced in the first and second ground conductors, which are line-symmetrical with respect to the central axis of the unbalanced feed material, and the first and second ground conductors are induced. A high-frequency current flows in one of the axial directions of the second ground conductor portion, and a high-frequency current is induced in the first and second non-feeding conductor portions which are line-symmetrical with respect to the central axis of the unbalanced feeding material, and the first and second ground conductors are A high-frequency current flows in the other axial direction of the second non-feeding conductor portion, and the high-frequency current flowing in one axial direction of the first ground conductor portion and the high-frequency current flowing in the other axial direction of the first non-feeding conductor portion cancel each other out. 2 The high-frequency current flowing in one axial direction of the ground conductor and the high-frequency current flowing in the other axial direction of the second non-feeding conductor cancel each other out, thereby canceling the unnecessary current and greatly improving the radiation gain in the antenna. A strong electromagnetic field with linear polarization whose vibration direction is parallel to the axial direction of the antenna is generated, and the antenna can be made into an antenna with high radiation gain. It can fly far away (increase the radiation gain). A wideband antenna can be used to make an antenna having a high radiation gain with VSWR (voltage standing wave ratio) of 2 or more and 3 or less, and all of the specific bands (frequency bands used) in which it can be used. It is possible to make an antenna capable of transmitting and receiving radio waves in a wide band (broadband) and capable of transmitting and receiving a wide band radio wave with only one antenna.

The wideband antennas in which the axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are λ / 8 to λ / 16 are the first and second non-feeding elements of the first non-feeding element. By setting the axial length of the non-feeding conductor portion to the above-mentioned length, the total length of the first and second non-feeding conductor portions becomes λ / 4, and the length of λ / 4 A high-frequency current is induced in the first and second ground conductors, and a high-frequency current flows in one of the axial directions of the first and second ground conductors, and flows in the first and second non-feeding conductors having a length of λ / 4. A high-frequency current is induced and a high-frequency current flows to the other axial direction of the first and second non-feeding conductor portions, and the high-frequency current flowing to one axial direction of the first ground conductor portion and the other axial direction of the first non-feeding conductor portion The high-frequency current that flows cancels each other out, and the high-frequency current that flows in one axial direction of the second ground conductor and the high-frequency current that flows in the other axial direction of the second non-feeding conductor cancel each other out, so that the unnecessary current is reliably canceled. Since the radiation gain in the antenna is greatly improved, a strong electromagnetic field with linear polarization in which the vibration direction of the electric current is parallel to the axial direction of the antenna is generated, and the antenna can be made into an antenna having a high radiation gain, and a predetermined electric current strength can be obtained. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain) while maintaining the above.

It has a second non-feeding element located between the first ground conductor portion and the second ground conductor portion in the axial direction of the first non-feeding element and facing the first non-feeding element, and has a second non-feeding element. The power feeding element is formed of a second non-feeding fixing portion, a third non-feeding conductor portion extending axially rearward from the second non-feeding fixing portion, and a fourth non-feeding conductor portion extending axially rearward from the second non-feeding fixing portion. In the wideband antenna, a high-frequency current is induced in the first and second ground conductors, a high-frequency current flows in one of the axial directions of the first and second ground conductors, and the high-frequency current extends in the axial direction of the first non-feeding element. A high-frequency current is induced in the 1st and 2nd non-feeding conductors, and a high-frequency current flows in the other axial direction of the 1st and 2nd non-feeding conductors, and the 3rd and 4th extending in the axial direction of the 2nd non-feeding element. A high-frequency current is induced in the non-feeding conductor portion, and a high-frequency current flows in the other axial direction of the third and fourth non-feeding conductor portions, and the high-frequency current flowing in one axial direction of the first ground conductor portion and the first and third none. The high-frequency current flowing in the axial direction of the feeding conductor cancels each other, and the high-frequency current flowing in one of the axial directions of the second ground conductor and the high-frequency current flowing in the axial direction of the second and fourth non-feeding conductors cancel each other out. By matching, unnecessary current is canceled and the radiation gain in the antenna is improved. Therefore, a strong electromagnetic field with linear polarization in which the vibration direction of the electric field is parallel to the axial direction of the antenna is generated, and the antenna has a high radiation gain. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain) while maintaining a predetermined electric current strength.

A broadband antenna in which the third non-feeding conductor portion and the fourth non-feeding conductor portion of the second non-feeding element are in a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material has a relationship with respect to the central axis of the unbalanced feeding material. A high-frequency current is induced in the third and fourth non-feeding conductors, which are line-symmetrical with each other, and a high-frequency current flows in the other axial direction of the third and fourth non-feeding conductors, and the axial direction of the first ground conductor. The high-frequency current flowing in one direction and the high-frequency current flowing in the axial direction of the third non-feeding conductor cancel each other out, and the high-frequency current flowing in one axial direction of the second ground conductor and the axial other of the fourth non-feeding conductor section cancel each other out. By canceling out the flowing high-frequency current, unnecessary current is surely canceled and the radiation gain in the antenna is greatly improved. Therefore, a strong electromagnetic field with linear polarization in which the vibration direction of the electric field is parallel to the axial direction of the antenna is generated. It is possible to make an antenna having a high radiation gain, and it is possible to send a wide band radio wave to a wide range and a long distance (increase the radiation gain) while maintaining a predetermined electric current strength.

The axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are λ / 8 to λ / 16, and the third non-feeding conductor portion and the second non-feeding conductor portion of the second non-feeding element. 4. In the wideband antenna in which the axial length of the non-feeding conductor portion is λ / 8 to λ / 16, the axial length of the first and second non-feeding conductor portions of the first non-feeding element is set to the length. By setting the axial lengths of the third non-feeding conductor portion and the fourth non-feeding conductor portion of the second non-feeding element to the above-mentioned lengths, the first non-feeding conductor portion and the second non-feeding conductor portion are set. The combined length of the axial lengths of the portions is λ / 4, and the combined axial lengths of the third non-feeding conductor portion and the fourth non-feeding conductor portion are λ / 4. A high-frequency current is induced in the first and second ground conductors having a length of λ / 4, and a high-frequency current flows in one of the axial directions of the first and second ground conductors. A high-frequency current is induced in the fourth non-feeding conductor portion, a high-frequency current flows in the other axial direction of the first to fourth non-feeding conductor portions, and the high-frequency current flows in one axial direction of the first and second ground conductor portions. Axial direction of the 1st to 4th non-feeding conductors By canceling the high-frequency current flowing to the other side, unnecessary current is surely canceled and the radiation gain in the antenna is greatly improved. Therefore, the vibration direction of the electric field is the axial direction of the antenna. A strong electromagnetic field with parallel linear polarization is generated, and an antenna with high radiation gain can be obtained, and a wide band radio wave is sent over a wide range and far away (increasing radiation gain) while maintaining a predetermined electric current strength. be able to.

The first non-feeding conductor portion of the first non-feeding element and the third non-feeding conductor portion of the second non-feeding element are in a state where one of the conductor portions is on the top and the other is on the bottom. The second non-feeding conductor portion of the first non-feeding element and the fourth non-feeding conductor portion of the second non-feeding element are arranged so as to be separated from each other in the thickness direction of the wideband antenna, and one of the conductor portions is on the top. The wideband antennas arranged so as to be separated from each other in the thickness direction of the wideband antenna with one of them facing down are the front end of the first non-feeding conductor portion of the first non-feeding element and the second non-feeding element. The rear ends of the third non-feeding conductor are overlapped with each other in contact with each other, and the front end of the second non-feeding conductor of the first non-feeding element and the rear end of the fourth non-feeding conductor of the second non-feeding element are overlapped with each other. If they overlap in the abutting state, the high frequency current is not induced in the first to fourth non-feeding conductors, and the high frequency currents flowing in the first and second ground conductors cannot be canceled. The first non-feeding conductor portion and the third non-feeding conductor portion of the second non-feeding element are arranged so as to be separated from each other in the thickness direction of the broadband antenna, and the second non-feeding conductor portion of the first non-feeding element and the second non-feeding conductor portion are arranged. By arranging the fourth non-feeding conductor portion of the element so as to be separated and opposed to each other in the thickness direction of the broadband antenna, a high frequency current is induced in the first and second non-feeding conductor portions extending in the axial direction of the first non-feeding element. A high-frequency current flows to the other axial direction of the first and second non-feeding conductors, and a high-frequency current is induced in the third and fourth non-feeding conductors extending in the axial direction of the second non-feeding element to induce the third and fourth. A high-frequency current flows in the other axial direction of the non-feeding conductor portion, and the high-frequency current flowing in one axial direction of the first ground conductor portion and the high-frequency current flowing in the other axial direction of the first and third non-feeding conductor portions cancel each other out. The high-frequency current flowing in one axial direction of the second ground conductor and the high-frequency current flowing in the other axial direction of the second and fourth non-feeding conductors cancel each other out, thereby canceling the unnecessary current and improving the radiation gain in the antenna. Therefore, a strong electromagnetic field with linear polarization whose vibration direction of the electric current is parallel to the axial direction of the antenna is generated, and the antenna can be made into an antenna having a high radiation gain. Can be flown over a wide area and far away (increasing the radiation gain).

The front end of the first non-feeding conductor portion of the first non-feeding element faces slightly rearward in the axial direction from the rear end of the third non-feeding conductor portion of the second non-feeding element, and the second non-feeding element of the first non-feeding element. The wideband antenna in which the front end of the feeding conductor portion is slightly separated and opposed to the rear end in the axial direction from the rear end of the fourth non-feeding conductor portion of the second non-feeding element is the first non-feeding conductor portion of the first non-feeding element. The front end and the rear end of the third non-feeding conductor portion of the second non-feeding element come into contact with each other, and the front end of the second non-feeding conductor portion of the first non-feeding element and the fourth non-feeding conductor portion of the second non-feeding element When it comes into contact with the rear end, a high-frequency current is not induced in the first to fourth non-feeding conductors, and the high-frequency current flowing in the first and second ground conductors cannot be canceled. The front end of the first non-feeding conductor portion and the rear end of the third non-feeding conductor portion of the second non-feeding element are slightly separated and opposed in the axial direction, and are opposed to the front end of the second non-feeding conductor portion of the first non-feeding element. By slightly separating and facing the rear end of the fourth non-feeding conductor portion of the second non-feeding element in the axial direction, a high-frequency current is applied to the first and second non-feeding conductor portions extending in the axial direction of the first non-feeding element. Is induced and a high-frequency current flows to the other axial direction of the first and second non-feeding conductors, and a high-frequency current is induced in the third and fourth non-feeding conductors extending in the axial direction of the second non-feeding element. A high-frequency current flows to the other axial direction of the 3rd and 4th non-feeding conductors, and a high-frequency current flowing to one axial direction of the 1st ground conductor and a high-frequency current flowing to the other axial direction of the 1st and 3rd non-feeding conductors. Cancel each other, and the high-frequency current flowing in one axial direction of the second ground conductor and the high-frequency current flowing in the other axial direction of the second and fourth non-feeding conductors cancel each other out, thereby canceling unnecessary current and radiating in the antenna. Since the gain is improved, a strong electromagnetic field with linear polarization in which the vibration direction of the electric current is parallel to the axial direction of the antenna is generated, and the antenna can be made with a high radiation gain, and a predetermined electric current strength is maintained. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain).

It has a feeding element that is molded into a plate shape with a predetermined area and is located in front of the axial direction of the resonance conductor, and the feeding element is electrically connected to the feeding portion. A first feeding conductor portion having a predetermined area located axially forward from the first resonance conductor portion of the resonance conductor and a second resonance conductor portion of the resonance conductor extending radially outward from the feeding fixing portion. In a broadband antenna having a second feeding conductor portion having a predetermined area located forward in the axial direction from the above, a high-frequency current flows in the axial direction of the first feeding conductor portion of the feeding element, and the axial direction of the second feeding conductor portion of the feeding element. A high-frequency current flows to, and the first feeding conductor portion of the feeding element and the first resonant conductor portion of the resonance conductor resonate with the axial high-frequency current induced in these conductor portions, and the second feeding conductor of the feeding element is resonated. It is possible to obtain a plurality of resonance frequencies with strong electric field strengths in which the band and the second resonance conductor portion of the resonance conductor resonate with each other due to the axial high-frequency current induced in the conductor portions and the bands differ due to the resonance of the conductor portions. Therefore, it is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain) while maintaining a predetermined electric current strength, and of course, the first and second feeding conductors of the feeding element and the resonance conductor are the first. By resonating with 1 and the resonance conductor portion, the frequency band to be resonated can be stabilized, and the resonance point of the antenna fluctuates even if an obstacle made of a conductor such as metal is close or present in the vicinity of the antenna. It is possible to prevent changes in the frequency band of the antenna, maintain the conversion efficiency of converting high-frequency current into radio waves, and transmit and receive radio waves in the frequency band as designed. In the wideband antenna, the size (area) of the first and second feeding conductors of the feeding element is increased, so that the feeding portion of the unbalanced feeding material and the first and second resonance conductors of the resonance conductor resonate with each other. The movement of the point to a higher position can be increased, and by reducing the size (area) of the first and second feeding conductors of the feeding element, the feeding portion of the unbalanced feeding material and the first conductor for resonance can be reduced. The movement of the resonance point with the second resonant conductor portion to a higher position can be reduced, and by changing the size (area) of the first and second feeding conductor portions of the feeding element, the specific band (specific band) in the antenna ( It is possible to fine-tune the movement of the frequency band used to higher levels.

A high-frequency current is induced in the first feeding conductor portion in which a plurality of stepped first stepped portions are formed, and a high-frequency current flows axially from the rear end to the front end of the first feeding conductor portion, resulting in a plurality of stepped shapes. A high-frequency current is induced in the second feeding conductor portion in which the second step portion is formed, and a high-frequency current flows in the axial direction from the rear end to the front end of the second feeding conductor portion, and a plurality of the first feeding conductor portions are formed. The first step portion of the above and the first resonance conductor portion of the resonance conductor resonate with a plurality of axial high-frequency currents induced in these conductor portions, and at the same time, resonate with the plurality of first step portions of the second feeding conductor portion. Since the second resonance conductor portion of the conductor resonates a plurality of times due to the high-frequency current in the axial direction induced in the conductor portion, and the resonance of the conductor portion can obtain a plurality of resonance frequencies having strong electric field strengths having different bands. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain) while maintaining a predetermined electric current strength, and of course, the first and first power feeding elements in which a plurality of first and second step portions are formed are formed. 2 By resonating the feeding conductor portion with the first resonance conductor portion and the resonance conductor portion, the frequency band to be resonated can be stabilized, and an obstacle made of a conductor such as metal is close to or exists in the vicinity of the antenna. Even so, the resonance point of the antenna does not fluctuate, the change in the frequency band of the antenna can be prevented, the conversion efficiency of converting the high-frequency current into radio waves can be maintained, and the radio waves in the frequency band as designed can be maintained. Can be sent and received.

A broadband antenna in which the first feeding conductor portion and the second feeding conductor portion of the feeding element have a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material has a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material. A high-frequency current flows in the axial direction of the first and second feeding conductors in the above, and the first and second feeding conductors of the feeding element and the first and second resonant conductors of the resonance conductor are induced in the conductors. It resonates with the same electrolytic strength due to the high-frequency current in the axial direction, and multiple resonance frequencies with strong electric field strengths in different bands can be obtained by the resonance of these conductors. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain), and even if an obstacle made of a conductor such as metal is near or present near the antenna, the resonance point of the antenna does not fluctuate. , The change of the frequency band of the antenna can be prevented, the conversion efficiency of converting the high frequency current into the radio wave can be maintained, and the radio wave of the frequency band as designed can be transmitted and received.

The unbalanced feeding material is formed of a first conductor extending in the axial direction, an insulator covering the outer peripheral surface of the first conductor, and a second conductor covering the outer peripheral surface of the insulator and extending in the axial direction, and is unbalanced. The feeding part of the feeding material is formed from the first conductor, the non-feeding part of the unbalanced feeding material is formed from the first and second conductors and the insulator, and the fixing conductor is electrically connected to the second conductor. In a broadband antenna in which the feeding element is electrically connected to the first conductor, the first and second resonance conductor portions and the feeding portion formed from the first conductor easily resonate with high efficiency, and the first and second resonant conductors are easily resonated with each other. The second ground conductor portion and the non-feeding portion formed of the first and second conductors and the insulator resonate easily with high efficiency, and it is possible to obtain a plurality of resonance frequencies, and a plurality of obtained resonances can be obtained. Since the frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap with each other, not only the specific band (about 100 MHz to about 10.0 GHz) of the antenna can be significantly widened, but also the first ground conductor portion. The high-frequency current flowing in one axial direction of the The unnecessary current is canceled by canceling the high-frequency current flowing to the other side in the axial direction of the second non-feeding conductor portion (and the fourth non-feeding conductor portion), and the radiation gain in the antenna is improved, so that the vibration direction of the electric field is changed. A strong electromagnetic field with linear polarization parallel to the axial direction of the antenna is generated, and the antenna can be made with a high radiation gain, and a wide band radio wave is sent over a wide range and far away while maintaining a predetermined electric current strength ( Radiation gain can be increased). The wideband antenna can maintain stable impedance by interposing an insulator between the first conductor and the second conductor, and also prevents a short circuit between the first conductor and the second conductor of the unbalanced feeding material. This makes it possible to prevent the high frequency circuit of the transmitter / receiver from being destroyed due to a short circuit between the conductors.

A perspective view of a wideband antenna shown as an example. FIG. 1 is an end view taken along the line AA. BB line end view of FIG. A perspective view of a wideband antenna shown as another example. A perspective view of a wideband antenna shown as another example. FIG. 5 is an end view taken along the line CC. FIG. 5 is an end view of the DD line. A perspective view of a wideband antenna shown as another example. EE line end view of FIG. A perspective view of a wideband antenna shown as another example. FIG. 10 is an end view of the FF line. FIG. 10 is an end view of the GG line. A perspective view of a wideband antenna shown as another example. The figure which shows the correlation between VSWR (voltage standing wave ratio) and use band in a wide band antenna. Smith chart showing the impedance of a wideband antenna. The figure which shows the electric field strength measured in the direction around 3 planes (XY planes) of a wide band antenna. The figure which shows the electric field strength measured in the direction around 3 planes (YZ plane or ZX plane) of a wide band antenna.

The details of the wideband antenna according to the present invention will be described below with reference to the accompanying drawings such as FIG. 1 which is a perspective view of the wideband antenna 10A shown as an example. 2 is an end view taken along the line AA of FIG. 1, and FIG. 3 is an end view taken along the line BB of FIG. In FIG. 1, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. In FIGS. 2 and 3, the thickness direction is indicated by an arrow Z. In FIG. 1, the central axis S1 is shown by a dotted line.

The wideband antenna 10A is composed of an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, and a feeding element 16. The unbalanced feeding material 11 has a predetermined length and extends in the axial direction. The unbalanced feeding material 11 includes a rod-shaped elongated first conductor 17 (central metal conductor) extending in the axial direction and a first insulator 18 having a circular cross section extending in the axial direction so as to cover the outer peripheral surface of the first conductor 17. , Is formed from a second conductor 19 (outer metal conductor) having a cylindrical cross section extending in the axial direction so as to cover the outer peripheral surface of the first insulator 18. In the unbalanced feeding material 11, the outer peripheral surface of the first conductor 17 and the inner peripheral surface of the first insulator 18 are fixed, and the outer peripheral surface of the first insulator 18 and the inner peripheral surface of the second conductor 19 are fixed. ing.

The unbalanced feeding material 11 has a feeding portion 20 set to a length of approximately λ / 4 (predetermined length) and nothing set to a length of substantially λ / 4 (predetermined length) connected to the feeding portion 20. It has a power feeding unit 21 (the length of the non-feeding unit 21 can be added to λ / 4 by about 30 mm). The feeding portion 20 is formed of the first conductor 17, the first conductor 17, and the first insulator 18, and extends substantially linearly in the axial direction. The non-feeding portion 21 is formed of a first conductor 17, a first insulator 18, and a second conductor 19, and extends substantially linearly rearward from the feeding portion 20 in the axial direction.

The unbalanced feeding material 11 includes, in addition to the first conductor 17, the first insulator 18, and the second conductor 19, a second insulator (not shown) that covers the outer peripheral surface of the second conductor 19. You may. In this case, the outer peripheral surface of the second conductor 19 and the inner peripheral surface of the second insulator are fixed, and the feeding portion 20 is formed of the first conductor 17, the first conductor 17, and the first insulator 18, and is absent. The power feeding unit 121 is formed of a first conductor 17, a first insulator 18, a second conductor 10, and a second insulator. A conductive metal such as aluminum, copper, or an alloy can be used for the first conductor 17 and the second conductor 19, and the impedance of the unbalanced feeding material 11 is applied to the first insulator 18 and the second insulator. A thermoplastic synthetic resin as a material for fixing can be used, and it is preferable to use polytetrafluoroethylene having a plastic-based dielectric constant.

The resonance conductor 12 is an axially elongated wire having a circular cross section, is made of a conductive metal (aluminum, copper, alloy, etc.), and resonates with the feeding portion 20 of the unbalanced feeding material 11. The resonance conductor 12 is formed of a first resonance conductor portion 22a and a second resonance conductor portion 22b that are arranged radially outward from the feeding portion 20 with the feeding portion 20 interposed therebetween. The first resonance conductor portion 22a and the second resonance conductor portion 22b are made by molding a conductive metal into a linear or rod shape.

The base end portion of the first resonant conductor portion 22a is electrically connected (fixed) to the fixing conductor 14. The first resonance conductor portion 22a is separated radially outward of the unbalanced feeding material 11 (feeding portion 20), and extends axially forward from the fixing conductor 14 in parallel with the feeding portion 20. The first resonant conductor portion 22a resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11. The base end portion of the second resonant conductor portion 22b is electrically connected (fixed) to the fixing conductor 14. The second resonance conductor portion 22b is located on the opposite side of the first resonance conductor portion 22a with the unbalanced feeding material 11 (feeding portion 20) interposed therebetween, and is separated outward in the radial direction of the unbalanced feeding material 11 and fed. It extends axially forward from the fixing conductor 14 in parallel with the portion 20. The second resonant conductor portion 22a resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11.

The first resonance conductor portion 22a draws an arc so as to gradually separate from the unbalanced feeding material 11 (feeding portion 20) in the axially forward direction from the fixing conductor 14. The second resonance conductor portion 22b draws an arc so as to gradually separate from the unbalanced feeding material 11 (feeding portion 20) in the axially forward direction from the fixing conductor 14. The first resonance conductor portion 22a may extend linearly from the fixing conductor 14 toward the front in the axial direction so as to be gradually separated from the unbalanced feeding material 11 (feeding portion 20), and the second resonance conductor portion may be extended. The 22b may extend linearly from the fixing conductor 14 toward the front in the axial direction so as to gradually separate from the unbalanced feeding material 11 (feeding portion 20). In this case, the first and second resonant conductor portions 22a and 22b are inclined toward the front in the axial direction at a predetermined angle with respect to the unbalanced feeding material 11 (feeding portion 20).

The first resonant conductor portion 22a and the second resonant conductor portion 22b have a line-symmetrical (plane-symmetrical) relationship with respect to the central axis S1 of the unbalanced feeding material 11, and have the same cross-sectional shape and they. The axial length L1 of is the same. Further, the radial separation dimension L2 of the first resonant conductor portion 22a (inner edge) from the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material 11 and the radial direction of the second resonant conductor portion 22b (inner edge). The separation dimension L2 of is the same. The feeding portion 20 of the unbalanced feeding material 11 is connected to the parallel portion 23 extending in parallel with the first and second resonant conductor portions 22a and 22b and the first and second resonant conductor portions 22a and 22b connected to the parallel portion 23. It has an extension portion 24 that extends forward in the axial direction.

The ground conductor 13 is an axially elongated wire having a circular cross section, is made of a conductive metal (aluminum, copper, alloy, etc.), and resonates with the non-feeding portion 21 of the unbalanced feeding material 11. The ground conductor 14 is formed of a first ground conductor portion 25a and a second ground conductor portion 25b that are arranged radially outward from the non-feeding portion 21 with the non-feeding portion 21 interposed therebetween. The first ground conductor portion 25a and the second ground conductor portion 25b are made by molding a conductive metal into a linear or rod shape.

The base end portion of the first ground conductor portion 25a is electrically connected (fixed) to the fixing conductor 14. The first ground conductor portion 25a is separated radially outward from the unbalanced feeding material 11 (non-feeding portion 21) and extends axially rearward from the fixing conductor 14. The first ground conductor portion 25a (ground conductor 13) is integrated with the first resonance conductor portion 22a (resonance conductor 12) and is connected to the first resonance conductor portion 22a. The first ground conductor portion 25a and the inclined portion 26a extending divergently at a predetermined angle so as to be gradually separated from the unbalanced feeding material 11 (non-feeding portion 21) from the fixing conductor 14 toward the rear in the axial direction. It has a straight portion 27a extending in parallel with the unbalanced feeding material 11 (non-feeding portion 21) from the inclined portion 26a toward the rear in the axial direction. The first ground conductor portion 25a (inclined portion 26a, straight portion 27a) resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The base end portion of the second ground conductor portion 25b is electrically connected (fixed) to the fixing conductor 14. The second ground conductor portion 25b is located on the opposite side of the first ground conductor portion 25a with the unbalanced feeding material 11 (feeding portion 21) interposed therebetween, and is separated and fixed in the radial direction of the unbalanced feeding material 11. It extends axially rearward from the conductor 14. The second ground conductor portion 25b (ground conductor 13) is integrated with the second resonance conductor portion 22b (resonance conductor 12) and is connected to the second resonance conductor portion 22b. The second ground conductor portion 25b includes an inclined portion 26b extending divergently at a predetermined angle so as to be gradually separated from the unbalanced feeding material 11 (feeding portion 21) from the fixing conductor 14 toward the rear in the axial direction. It has a straight portion 27b extending in parallel with the unbalanced feeding material 11 (non-feeding portion 21) from the inclined portion 26b toward the rear in the axial direction. The second ground conductor portion 25b (inclined portion 26b, straight portion 27b) resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The first ground conductor portion 25a and the second ground conductor portion 25b have a line-symmetrical (plane-symmetrical) relationship with respect to the central axis S1 of the unbalanced feeding material 11, and they have the same cross-sectional shape and they. The axial lengths L3 of are the same. Further, the radial distance dimension L4 of the first ground conductor portion 25a (inner edge) from the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11 and the diameter of the second ground conductor portion 25b (inner edge). The separation dimension L4 in the direction is the same. The non-feeding portion 21 of the unbalanced feeding material 11 has a parallel portion 28 extending in parallel with the first and second ground conductor portions 25a and 25b, and a first and second ground conductor portions 25a and 25b connected to the parallel portion 28. It has an extension portion 29 extending from the rear in the axial direction. A connector 30 is attached to the rear end (rear end of the unbalanced feeding material 11) of the extending portion 29 of the non-feeding portion 21.

The fixing conductor 14 is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a ring shape. The fixing conductor 14 is located between the resonance conductor 12 (first and second resonance conductor portions 22a, 22b) and the ground conductor 13 (first and second ground conductor portions 25a, 25b), and is unbalanced. It is fixed (connected) to the material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21 located near the boundary between the feeding portion 20 and the non-feeding portion 21) by welding (soldering or the like) (fixing means). , Is electrically connected to the unbalanced feeding material 11.

The first non-feeding element 15 is made of a conductive metal (aluminum, copper, alloy, etc.) and is located between the first ground conductor portion 25a and the second ground conductor portion 25b. The first non-feeding element 15 is formed of a first non-feeding fixing portion 31, a first non-feeding conductor portion 32, and a second non-feeding conductor portion 33. In the first non-feeding element 15, the first non-feeding fixing portion 31, the first non-feeding conductor portion 32, and the second non-feeding conductor portion 33 are integrally formed. The first non-feeding fixing portion 31 is formed into a rectangular thin plate having a predetermined area long in the radial direction, and is located between the rear end of the first ground conductor portion 25a and the rear end of the second ground conductor portion 25b. .. The first non-feeding fixing portion 31 is fixed (connected) to the unbalanced feeding material 11 by being crimped to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21), and is unbalanced. It is electrically connected to the feeding material 11. The first non-feeding fixing portion 31 is fixed (connected) to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21) by welding (soldering or the like) (fixing means). May be good.

The first non-feeding conductor portion 32 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located between the unbalanced feeding material 11 (non-feeding portion 21) and the first ground conductor portion 25a, and is unbalanced. The feeding material 11 (non-feeding portion 21) is separated radially outward, and the first ground conductor portion 25a is separated radially inward. The base end of the first non-feeding conductor portion 32 is connected to the first non-feeding fixing portion 31, and is axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The length L5 of the first non-feeding conductor portion 32 in the axial direction is λ / 8 to λ / 16. The first non-feeding conductor portion 32 is parallel to the straight portion 27a of the first ground conductor portion 25a. A high-frequency current flows through the first non-feeding conductor portion 32 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The second non-feeding conductor portion 33 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located on the opposite side of the first non-feeding conductor portion 32 with the unbalanced feeding material 11 (non-feeding portion 21) interposed therebetween. At the same time, it is located between the unbalanced feeding material 11 (non-feeding portion 21) and the second ground conductor portion 25b, and is separated outward in the radial direction of the unbalanced feeding material 11 and the diameter of the second ground conductor portion 25b. Separated inward in the direction. The base end of the second non-feeding conductor portion 33 is connected to the first non-feeding fixing portion 31, and is axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The second passive conductor portion 33 has an axial length L5 of λ / 8 to λ / 16. The second non-feeding conductor portion 33 is parallel to the straight portion 27b of the second ground conductor portion 25b. A high-frequency current flows through the second non-feeding conductor portion 33 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction). The first non-feeding fixing portion 31 is formed in a ring shape like the fixing conductor 14, and the first non-feeding conductor portion 32 and the second non-feeding conductor portion 33 are the first and second resonant conductor portions 22a and 22b. And the first and second ground conductor portions 25a and 25b may be formed into striations (linear or rod-shaped).

The first non-feeding conductor portion 32 and the second non-feeding conductor portion 33 are line-symmetrical (plane-symmetrical) with respect to the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11 (non-feeding portion 21). The cross-sectional shapes are the same, and their axial lengths L5 are the same. Further, the radial separation dimension L6 of the first non-feeding conductor portion 32 (inner edge) and the radial separation dimension L6 of the second non-feeding conductor portion 33 (inner edge) with respect to the central axis S1 of the unbalanced feeding material 11. Are the same. In the first non-feeding element 15, the length obtained by adding the axial length L5 of the first non-feeding conductor portion 32 to the axial length L5 of the second non-feeding conductor portion 33 is λ / 4.

The power feeding element 16 is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a thin plate having a predetermined area. The feeding element 16 is positioned (separated) in the axially forward direction of the resonance conductor 12 (first resonance conductor portion 22a and second resonance conductor portion 22b), and is located at the front end portion 34 of the unbalanced feeding material 11 (feeding portion 21). is set up. The power feeding element 16 is formed of a power feeding fixing portion 35, a first feeding conductor portion 36, and a second feeding conductor portion 37. The power supply fixing portion 35 is fixed (connected) to the front end portion 34 of the unbalanced power supply material 11 by being crimped to the unbalanced power supply material 11 (first conductor 17 (central metal conductor)), and the unbalanced power supply material 11 ( It is electrically connected to the first conductor 17 (central metal conductor). The feeding fixing portion 35 may be fixed (connected) to the unbalanced feeding material 11 (first conductor 17 (central metal conductor)) by welding (soldering or the like) (fixing means).

The first feeding conductor portion 36 is formed into a thin plate having a predetermined area long in the radial direction, and is positioned (separated) in the axially forward direction of the resonance conductor 12 (the first resonance conductor portion 25a and the second resonance conductor portion 25b). , It extends radially outward from the power feeding fixing portion 35 (front end portion 34 of the unbalanced feeding material 11). On the outer peripheral edge of the rear end 38 of the first feeding conductor portion 36, the rear end 38 is lined up in a staircase pattern (recessed in a staircase shape) toward the front end extending linearly in the radial direction from the rear end drawing an arc. A plurality of first stepped portions 39 having the same shape are formed. The first feeding conductor portion 36 resonates with the first resonance conductor portion 22a of the resonance conductor 12.

The second feeding conductor portion 37 is formed into a thin plate having a predetermined area long in the radial direction, and is positioned (separated) in the axially forward direction of the resonance conductor 12 (the first resonance conductor portion 25a and the second resonance conductor portion 25b). , It extends radially outward from the power feeding fixing portion 35 (front end portion 34 of the unbalanced feeding material 11). The outer peripheral edge of the rear end portion 38 of the second feeding conductor portion 37 is lined up in a staircase pattern (recessed in a staircase shape) toward the front end extending linearly in the radial direction from the rear end drawing an arc of the rear end portion 38. A plurality of second stepped portions 40 having the same shape are formed. The second feeding conductor portion 37 resonates with the second resonance conductor portion 25b of the resonance conductor 12. The first feeding conductor portion 36 and the second feeding conductor portion 37 have a line-symmetrical relationship with respect to the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material, and their planar shapes are the same (same shape). The same size) and their areas are the same.

FIG. 4 is a perspective view of the wideband antenna 10B shown as another example. In FIG. 4, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. The wideband antenna 10B of FIG. 4 is different from that of FIG. 1 in that it has a second non-feeding element 41, and the other configurations are the same as those of the wideband antenna 10A of FIG. By adding reference numerals and referring to the description of the wideband antenna 10A of FIG. 1, the description of other configurations of the wideband antenna 10B will be omitted.

The wideband antenna 10B includes an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, a second non-feeding element 41, and a feeding element 16. It is formed from and. The unbalanced feeding material 11, the resonance conductor 12, the ground conductor 13, the fixing conductor 14, the first non-feeding element 15, and the feeding element 16 are the same as those of the wideband antenna 10A of FIG.

The second non-feeding element 41 is made of a conductive metal (aluminum, copper, alloy, etc.), and is between the first ground conductor portion 25a and the second ground conductor portion 25b, and is the shaft of the first non-feeding element 15. It is located forward in the direction and faces the first non-feeding element 15. The second non-feeding element 41 is formed of a second non-feeding fixing portion 42, a third non-feeding conductor portion 43, and a fourth non-feeding conductor portion 44. In the second non-feeding element 41, the second non-feeding fixing portion 42, the third non-feeding conductor portion 43, and the fourth non-feeding conductor portion 44 are integrally formed. The second non-feeding fixing portion 42 is formed into a rectangular thin plate having a predetermined area long in the radial direction, and is located between the inclined portion 26a of the first ground conductor portion 25a and the inclined portion 26b of the second ground conductor portion 25b. ing. The second non-feeding fixing portion 41 is fixed (connected) to the unbalanced feeding material 11 by being crimped to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21), and is unbalanced. It is electrically connected to the feeding material 11. The second non-feeding fixing portion 42 is fixed (connected) to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21) by welding (soldering or the like) (fixing means). May be good.

The third non-feeding conductor portion 43 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located between the unbalanced feeding material 11 (non-feeding portion 21) and the first ground conductor portion 25a. 1 It is located in front of the non-feeding conductor portion 32 in the axial direction. The third non-feeding conductor portion 43 is separated in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21) and inward in the radial direction of the first ground conductor portion 25a. The base end portion of the third non-feeding conductor portion 43 is connected to the second non-feeding fixing portion 42, and the third non-feeding conductor portion 43 is axially rearward from the second non-feeding fixing portion 42 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The third non-feeding conductor portion 43 is parallel to the parallel portion 27a of the first ground conductor portion 25a. A high-frequency current flows through the third non-feeding conductor portion 43 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The fourth non-feeding conductor portion 44 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located on the opposite side of the third non-feeding conductor portion 43 with the unbalanced feeding material 11 (non-feeding portion 21) interposed therebetween. At the same time, it is located between the unbalanced feeding material 11 (non-feeding portion 21) and the second ground conductor portion 25b, and is located axially forward of the second non-feeding conductor portion 33. The fourth non-feeding conductor portion 44 is separated in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21) and inward in the radial direction of the second ground conductor portion 25b. The base end portion of the fourth non-feeding conductor portion 44 is connected to the second non-feeding fixing portion 42, and the fourth non-feeding conductor portion 44 is axially rearward from the second non-feeding fixing portion 42 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The fourth passive conductor portion 44 is parallel to the parallel portion 27b of the second ground conductor portion 25b. A high-frequency current flows through the fourth non-feeding conductor portion 44 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction). The first non-feeding fixing portion 31 and the second non-feeding fixing portion 42 are formed in a ring shape in the same manner as the fixing conductor 14, and the first non-feeding conductor portion 32, the second non-feeding conductor portion 33, and the third non-feeding conductor portion 33 are formed. The feeding conductor portion 43 and the fourth non-feeding conductor portion 44 are formed into stripes (linear or rod-shaped) in the same manner as the first and second resonant conductor portions 22a and 22b and the first and second ground conductor portions 25a and 25b. May be.

The third non-feeding conductor portion 43 and the fourth non-feeding conductor portion 44 have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11. The cross-sectional shapes of the above are the same, and their axial lengths L7 are the same. Further, a radial separation dimension L8 of the third non-feeding conductor portion 43 (inner edge) and a radial separation dimension L8 of the fourth non-feeding conductor portion 44 (inner edge) with respect to the central axis S1 of the unbalanced feeding material 11. Are the same.

In the wideband antenna 10B, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8 to λ / 16, and the third non-feeding conductor The axial length L7 of the portion 43 and the axial length L7 of the fourth non-feeding conductor portion 44 are λ / 8 to λ / 16. The axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8, and the axial length L7 of the third non-feeding conductor portion 43. And when the axial length L7 of the fourth non-feeding conductor portion 44 is λ / 8, the length L5 of the first non-feeding conductor portion 32 plus the length L5 of the second non-feeding conductor portion 33 is added. (2 × L5) is λ / 4, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ / 4. Is. Further, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 16, and the axial length of the third non-feeding conductor portion 43. When the axial length L7 of the L7 and the fourth non-feeding conductor portion 44 is λ / 16, the length L5 of the second non-feeding conductor portion 33 is added to the length L5 of the first non-feeding conductor portion 32. The length (2 × L5) is λ / 8, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ. / 8, and the axial lengths (2 × L5) of the first and second non-feeding conductors 32 and 33 and the axial lengths (2 ×) of the third and fourth non-feeding conductors 43 and 44. The length to which L7) is added is λ / 4.

In the wideband antenna 10B, the front end 45 of the first non-feeding conductor portion 32 of the first non-feeding element 15 is slightly separated axially rearward from the rear end 46 of the third non-feeding conductor portion 43 of the second non-feeding element 41. A clearance (slight gap) is formed between the front end 45 of the first non-feeding conductor portion 32 and the rear end 46 of the third non-feeding conductor portion 43). The front end 45 of the second non-feeding conductor portion 33 of the first non-feeding element 15 is slightly separated axially rearward from the rear end 46 of the fourth non-feeding conductor portion 44 of the second non-feeding element 41 (range of 1 to 5 mm). ), And a clearance (slight gap) is formed between the front end 45 of the second non-feeding conductor portion 33 and the rear end 46 of the fourth non-feeding conductor portion 44.

Similar to the wideband antenna 10D of FIG. 8, the first non-feeding conductor portion and the third non-feeding conductor portion are in a state where the first non-feeding conductor portion is on the top and the third non-feeding conductor portion is on the bottom. The second non-feeding conductor portion and the fourth non-feeding conductor portion are arranged in a state where the second non-feeding conductor portion is on the top and the fourth non-feeding conductor portion is on the bottom. The wideband antennas may be arranged so as to be separated from each other in the thickness direction.

5 is a perspective view of the wideband antenna 10C shown as another example, FIG. 6 is a CC line end view of FIG. 5, and FIG. 7 is a DD line end view of FIG. In FIG. 5, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. In FIGS. 6 and 7, the thickness direction is indicated by an arrow Z. In FIG. 5, the central axis S1 is shown by a dotted line. The wideband antenna 10C of FIG. 5 differs from that of FIG. 1 in that the resonance conductor 12, the ground conductor 13, and the fixing conductor 14 are formed in a rectangular thin plate shape, and the other configurations are shown in FIG. Since it is the same as that of the wideband antenna 10A of the above, the description of other configurations of the wideband antenna 10C will be omitted by referring to the description of the wideband antenna 10A of FIG.

The wideband antenna 10C is composed of an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, and a feeding element 16. The unbalanced feeding material 11, the first non-feeding element 15, and the feeding element 16 are the same as those of the wideband antenna 10A of FIG. The resonance conductor 12 is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a thin plate having a predetermined thickness and a predetermined area. The resonance conductor 12 resonates with the feeding portion 20 of the unbalanced feeding material 11. The resonance conductor 12 is formed of a first resonance conductor portion 22a and a second resonance conductor portion 22b that are radially spaced apart from each other with the feeding portion 20 in between.

The first resonance conductor portion 22a is made by molding a conductive metal into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the axial direction. The base end portion of the first resonant conductor portion 22a is electrically connected (fixed) to the fixing conductor 14. The first resonant conductor portion 22a is separated radially outward of the unbalanced feeding material 11 (feeding portion 20), and extends linearly forward from the fixing conductor 14 in parallel with the feeding portion 20. .. The first resonant conductor portion 22a resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11.

The second resonant conductor portion 22b is made by molding a conductive metal into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the axial direction. The base end portion of the second resonant conductor portion 22b is electrically fixed (connected) to the fixing conductor 14. The second resonance conductor portion 22b is located on the opposite side of the first resonance conductor portion 22a with the unbalanced feeding material 11 (feeding portion 20) interposed therebetween, and is separated outward in the radial direction of the unbalanced feeding material 11 and fed. It extends axially forward from the fixing conductor 14 in parallel with the portion 20. The second resonant conductor portion 22a resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11.

The first resonant conductor portion 22a and the second resonant conductor portion 22b have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material 11, and their planar shapes. Are the same, and their axial lengths L1 are the same. Further, the radial separation dimension L2 of the first resonance conductor portion 22a (inner edge) and the radial separation dimension L2 of the second resonance conductor portion 22b (inner edge) with respect to the central axis S1 of the unbalanced feeding material 11 are the same. Is.

The ground conductor 13 is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a thin plate having a predetermined thickness and a predetermined area. The ground conductor 13 resonates with the non-feeding portion 21 of the unbalanced feeding material 11. The ground conductor 14 is formed of a first ground conductor portion 25a and a second ground conductor portion 25b that are arranged radially apart with respect to the non-feeding portion 21.

The first ground conductor portion 25a is made by molding a conductive metal into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the axial direction. The first ground conductor portion 25a is integrated with the first resonance conductor portion 22a (resonance conductor 12), and its base end portion is electrically connected (fixed) to the fixing conductor 14. The first ground conductor portion 25a is separated radially outward of the unbalanced feeding material 11 (feeding portion 20), and extends axially rearward from the fixing conductor 14 in parallel with the feeding portion 20. The first ground conductor portion 25a resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The second ground conductor portion 25b is made by molding a conductive metal into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the axial direction. The second ground conductor portion 25b is integrated with the second resonance conductor portion 22b (resonance conductor 12), and its base end portion is electrically connected (fixed) to the fixing conductor 14. The second ground conductor portion 25b is separated radially outward of the unbalanced feeding material 11 (feeding portion 21), and extends axially rearward from the fixing conductor 14 in parallel with the feeding portion 21. The second ground conductor portion 25b resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The first ground conductor portion 25a and the second ground conductor portion 25b have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11, and their planes. The shapes are the same, and their axial lengths L3 are the same. Further, the radial separation dimension L4 of the first ground conductor portion 25a (inner edge) and the radial separation dimension L4 of the second ground conductor portion 25b (inner edge) with respect to the central axis S1 of the unbalanced feeding material 11 are the same. Is.

The fixing conductor 14 is made by molding a conductive metal (aluminum, copper, alloy, etc.) into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the radial direction. The fixing conductor 14 is located between the resonance conductor 12 (first and second resonance conductor portions 22a, 22b) and the ground conductor 13 (first and second ground conductor portions 25a, 25b), and is unbalanced power supply. It is fixed (connected) to the unbalanced feeding material 11 by being crimped to the material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21 located near the boundary between the feeding portion 20 and the non-feeding portion 21). , Is electrically connected to the unbalanced feeding material 11. The fixing conductor 14 is welded (soldered, etc.) to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21 located near the boundary between the feeding portion 20 and the non-feeding portion 21). It may be fixed (connected) by (fixing means). Further, the first non-feeding fixing portion 31 is formed in a ring shape like the fixing conductor 14 of FIG. 1, and the first non-feeding conductor portion 32 and the second non-feeding conductor portion 33 are the first and second conductors of FIG. Similar to the resonant conductor portions 22a and 22b and the first and second ground conductor portions 25a and 25b, they may be formed into linear lines (linear or rod-shaped).

FIG. 8 is a perspective view of the wideband antenna 10D shown as another example, and FIG. 9 is an end view of the line EE of FIG. In FIG. 8, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. In FIG. 9, the thickness direction is indicated by an arrow Z. The wideband antenna 10D of FIG. 8 is different from that of FIG. 5 in that it has a second non-feeding element 41, and the other configurations are the same as those of the wideband antenna 10C of FIG. The description of the other configurations of the wideband antenna 10D will be omitted by adding reference numerals and referring to the description of the wideband antenna 10A of FIG. 1 and the wideband antenna 10C of FIG.

The wideband antenna 10D includes an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, a second non-feeding element 41, and a feeding element 16. It is formed from and. The unbalanced feeding material 11, the first non-feeding element 15, and the feeding element 16 are the same as those of the wideband antenna 10A of FIG. 1, and the resonance conductor 12, the ground conductor 13, and the fixing conductor 14 are shown in FIG. It is the same as those of the wideband antenna 10C. The second non-feeding element 41 is the same as that of the wideband antenna 10B of FIG.

The first non-feeding conductor portion 32 of the first non-feeding element 15 is formed into a rectangular thin plate shape having a predetermined area long in the axial direction, and the unbalanced feeding material 11 (non-feeding portion) 21 and the rectangular thin plate-shaped first ground conductor. It is located between the unbalanced power supply material 11 and is separated in the radial direction of the unbalanced power feeding material 11 and is separated in the radial direction of the first ground conductor portion 25a to the non-feeding portion 21 of the unbalanced feeding material 11. In parallel, it extends forward in the axial direction from the first non-feeding fixing portion 31. The first non-feeding conductor portion 32 is parallel to the rectangular thin plate-shaped first ground conductor portion 25a. A high-frequency current flows through the first non-feeding conductor portion 32 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The second non-feeding conductor portion 33 of the first non-feeding element 15 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and the first non-feeding conductor portion sandwiches the unbalanced feeding material 11 (non-feeding portion 21). It is located on the opposite side of 32, and is located between the unbalanced feeding material 11 and the rectangular thin plate-shaped second ground conductor portion 25b, is separated radially outward of the unbalanced feeding material 11, and is separated from the second ground. The conductor portion 25b is separated inward in the radial direction. The second non-feeding conductor portion 33 extends axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The second non-feeding conductor portion 33 is parallel to the parallel portion of the rectangular thin plate-shaped second ground conductor portion 25b. A high-frequency current flows through the second non-feeding conductor portion 33 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction).

The third non-feeding conductor portion 43 of the second non-feeding element 41 is formed into a rectangular thin plate shape having a predetermined area long in the axial direction, and the unbalanced feeding material 11 (non-feeding portion 21) and the rectangular thin plate-shaped first ground conductor. Although it is located between the portion 25a and the first non-feeding conductor portion 32 in the axial direction, it is separated radially outward of the unbalanced feeding material 11 and within the radial direction of the first ground conductor portion 25a. It is separated toward you. The third non-feeding conductor portion 43 extends axially rearward from the second non-feeding fixing portion 42 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The third passive conductor portion 43 is parallel to the rectangular thin plate-shaped first ground conductor portion 25a. A high-frequency current flows through the third non-feeding conductor portion 43 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The fourth non-feeding conductor portion 44 of the second non-feeding element 41 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and the third non-feeding conductor portion sandwiches the unbalanced feeding material 11 (non-feeding portion 21). It is located on the opposite side of 43, and is located between the unbalanced feeding material 11 and the second ground conductor portion 25b, and is located axially forward of the second non-feeding conductor portion 33. The fourth non-feeding conductor portion 44 is separated in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21) and inward in the radial direction of the second ground conductor portion 25b. The fourth non-feeding conductor portion 44 extends axially rearward from the second non-feeding fixing portion 42 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The fourth passive conductor portion 44 is parallel to the rectangular thin plate-shaped second ground conductor portion 25b. A high-frequency current flows through the fourth non-feeding conductor portion 44 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction).

In the wideband antenna 10D, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8 to λ / 16, and the third non-feeding conductor The axial length L7 of the portion 43 and the axial length L7 of the fourth non-feeding conductor portion 44 are λ / 8 to λ / 16. The axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8, and the axial length L7 of the third non-feeding conductor portion 43. And when the axial length L7 of the fourth non-feeding conductor portion 44 is λ / 8, the length L5 of the first non-feeding conductor portion 32 plus the length L5 of the second non-feeding conductor portion 33 is added. (2 × L5) is λ / 4, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ / 4. Is. Further, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 16, and the axial length of the third non-feeding conductor portion 43. When the axial length L7 of the L7 and the fourth non-feeding conductor portion 44 is λ / 16, the length L5 of the second non-feeding conductor portion 33 is added to the length L5 of the first non-feeding conductor portion 32. The length (2 × L5) is λ / 8, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ. / 8, and the axial lengths (2 × L5) of the first and second non-feeding conductors 32 and 33 and the axial lengths (2 ×) of the third and fourth non-feeding conductors 43 and 44. The length to which L7) is added is λ / 4.

The first non-feeding element and the second non-feeding element are the first non-feeding conductor portion and the third non-feeding conductor portion in a state where the first non-feeding conductor portion is on the top and the third non-feeding conductor portion is on the bottom. Are lined up so as to be separated from each other in the thickness direction of the broadband antenna, and the first non-feeding conductor portion and the third non-feeding conductor portion partially overlap in the thickness direction. The first non-feeding conductor portion and the third non-feeding conductor portion are slightly separated in the thickness direction (range of 1 to 3 mm). Further, in a state where the second non-feeding conductor portion is on the top and the fourth non-feeding conductor portion is on the bottom, the second non-feeding conductor portion and the fourth non-feeding conductor portion are separated and opposed to each other in the thickness direction of the broadband antenna. The second non-feeding conductor portion and the fourth non-feeding conductor portion partially overlap each other in the thickness direction. The second non-feeding conductor portion and the fourth non-feeding conductor portion are slightly separated in the thickness direction (range of 1 to 3 mm). In a state where the third non-feeding conductor portion is on the top, the first non-feeding conductor portion is on the bottom, the fourth non-feeding conductor portion is on the top, and the second non-feeding conductor portion is on the bottom, these conductor portions are in the thickness direction. They may be lined up so as to be separated from each other.

Similar to the wideband antenna 10B of FIG. 4, the front end 45 of the first non-feeding conductor portion 32 of the first non-feeding element 15 is shafted from the rear end 46 of the third non-feeding conductor portion 43 of the second non-feeding element 41. The front end 45 of the second non-feeding conductor portion 33 of the first non-feeding element 15 is the rear end of the fourth non-feeding conductor portion 44 of the second non-feeding element 41, slightly separated rearward in the direction (range of 1 to 5 mm). It may be slightly separated (in the range of 1 to 5 mm) from 46 in the rear direction in the axial direction.

10 is a perspective view of the wideband antenna 10E shown as another example, FIG. 11 is an end view of the FF line of FIG. 10, and FIG. 12 is an end view of the GG line of FIG. In FIG. 10, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. In FIGS. 11 and 12, the thickness direction is indicated by an arrow Z. In FIG. 10, the central axis S1 is shown by a dotted line. The wideband antenna 10E is composed of a dielectric substrate 47, an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, and a feeding element 16. It is formed.

The dielectric substrate 47 is made of glass epoxy having a predetermined dielectric constant. The dielectric substrate 47 is formed into a plate shape having a predetermined thickness, and its planar shape is a square (rectangle) long in the axial direction. The dielectric substrate 47 has one surface 48 (upper surface) on which the unbalanced feeding material 11 is located and the other surface 49 (lower surface) located on the opposite side. The dielectric substrate 47 functions as a capacitance (capacitor) for accumulating electric charges in the wideband antenna 10E. In addition to the glass epoxy, the dielectric substrate 47 can also be made of a thermoplastic synthetic resin or a thermosetting synthetic resin having a predetermined dielectric constant.

The unbalanced feeding material 11 is the same as that of the wideband antenna 10A of FIG. The resonance conductor 12 is formed of a first resonance conductor portion 22a and a second resonance conductor portion 22b that are radially spaced apart from each other with the feeding portion 20 of the unbalanced feeding material 11 interposed therebetween. The first resonant conductor portion 22a is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a rectangular thin plate having a predetermined area. The base end of the first resonant conductor portion 22a is electrically connected (fixed) to the fixing conductor 14, and is separated outward in the radial direction of the unbalanced feeding material 11 (feeding portion 20), and the feeding portion 20 is provided. In parallel with, the fixing conductor 14 extends forward in the axial direction. The first resonant conductor portion 22a resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11.

The second resonant conductor portion 22b is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a rectangular thin plate having a predetermined area. The base end of the second resonant conductor portion 22b is electrically connected (fixed) to the fixing conductor 14, and is located on the opposite side of the first resonant conductor portion 22a with the unbalanced feeding material 11 (feeding portion 20) interposed therebetween. It is located and is spaced outward in the radial direction of the unbalanced feeding material 11, and extends axially forward from the fixing conductor 14 in parallel with the feeding portion 20. The second resonant conductor portion 22b resonates with the feeding portion 20 (first conductor 17 (central metal conductor)) of the unbalanced feeding material 11.

The first resonance conductor portion 22a and the second resonance conductor portion 22b are joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The first and second resonant conductor portions 22a and 22b have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material 11, and their planar shapes are different. They have the same shape and the same size, and their axial lengths L1 are the same. Further, the radial separation dimension L2 of the first resonant conductor portion 22a (inner edge) from the central axis S1 (center of the feeding portion 17) of the unbalanced feeding material 11 and the radial direction of the second resonant conductor portion 22b (inner edge). The separation dimension L2 of is the same. The feeding portion 17 of the unbalanced feeding material 11 is connected to the parallel portion 23 extending in parallel with the first and second resonant conductor portions 22a and 22b and the first and second resonant conductor portions 22a and 22b connected to the parallel portion 23. It has an extension portion 24 that extends forward in the axial direction.

The ground conductor 13 is formed of a first ground conductor portion 25a and a second ground conductor portion 25b that are arranged radially apart with respect to the non-feeding portion 21. The first ground conductor portion 25a is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a rectangular thin plate having a predetermined area and long in the axial direction. The base end of the first ground conductor portion 25a is electrically connected (fixed) to the fixing conductor 14, and is separated outward in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21), and no feeding is performed. It extends axially rearward from the fixing conductor 14 in parallel with the portion 21. The first ground conductor portion 25a resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The second ground conductor portion 25b is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a rectangular thin plate having a predetermined area and long in the axial direction. The base end of the second ground conductor portion 25b is electrically connected (fixed) to the fixing conductor 13, and the unbalanced feeding material 11 (non-feeding portion 21) is sandwiched between the second ground conductor portion 25b and the opposite side of the first ground conductor portion 25a. The unbalanced feeding material 11 is radially outwardly separated from the unbalanced feeding material 11 and extends axially rearward from the fixing conductor 14 in parallel with the non-feeding portion 21. The second ground conductor portion 25b resonates with the non-feeding portion 21 (second conductor 19 (outer metal conductor)) of the unbalanced feeding material 11.

The first ground conductor portion 25a and the second ground conductor portion 25b are joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The first and second ground conductor portions 25a and 25b have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11, and their planar shapes. Are of the same shape and size, and their axial lengths L3 are the same. Further, the radial distance dimension L4 of the first ground conductor portion 25a (inner edge) from the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11 and the diameter of the second ground conductor portion 25b (inner edge). The separation dimension L4 in the direction is the same.

The non-balanced feeding material 11 has a parallel portion 28 extending in parallel with the first and second ground conductor portions 25a and 25b, and a first and second ground conductor portions 25a and 25b connected to the parallel portion 28. It has an extension portion 29 extending from the rear in the axial direction. A connector 30 is attached to the rear end (rear end of the unbalanced feeding material 11) of the extending portion 29 of the non-feeding portion 21. In the wideband antenna 10E, the axial lengths of the first ground conductor portion 25a and the second ground conductor portion 25b are longer than the axial lengths of the first resonance conductor portion 22a and the second resonance conductor portion 22b, and the first ground The axial length of the conductor portion 25a and the second ground conductor portion 25b is about four times the axial length of the first resonance conductor portion 22a and the second resonance conductor portion 22b.

The fixing conductor 14 is made by molding a conductive metal (aluminum, copper, alloy, etc.) into a rectangular thin plate having a predetermined area, and the planar shape thereof is a rectangle long in the radial direction. The fixing conductor 14 is located between the resonance conductor 12 (first and second resonance conductor portions 22a, 22b) and the ground conductor 13 (first and second ground conductor portions 25a, 25b), and is unbalanced. It is fixed (connected) to the material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21 located near the boundary between the feeding portion 20 and the non-feeding portion 21) by welding (soldering or the like) (fixing means). , Is electrically connected to the unbalanced feeding material 11. The fixing conductor 14 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47.

The first non-feeding element 15 is made of a conductive metal (aluminum, copper, alloy, etc.) and is located between the first ground conductor portion 25a and the second ground conductor portion 25b. The first non-feeding element 15 is formed of a first non-feeding fixing portion 31, a first non-feeding conductor portion 32, and a second non-feeding conductor portion 33. The first non-feeding element 15 (first non-feeding fixing portion 31, first non-feeding conductor portion 32, second non-feeding conductor portion 33) is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. Has been done. The first non-feeding fixing portion 31 is formed into a rectangular thin plate having a predetermined area and is long in the radial direction, and is located between the first ground conductor portion 25a and the second ground conductor portion 25b. It is fixed (connected) to the second conductor 19 (outer metal conductor) of the non-feeding portion 21 by welding (soldering or the like) (fixing means), and is fixed (connected) to the unbalanced feeding material 11 (second conductor 19 outer metal of the non-feeding portion 21). It is electrically connected to the conductor)).

The first non-feeding conductor portion 32 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located between the non-feeding portion 21 of the unbalanced feeding material 11 and the first ground conductor portion 25a. The (non-feeding portion 21) is separated in the radial direction and the first ground conductor portion 25a is separated in the radial direction. The base end of the first non-feeding conductor portion 32 is connected to the first non-feeding fixing portion 31, and is axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The first non-feeding conductor portion 32 has an axial length L5 of λ / 8 to λ / 16, and is parallel to the first ground conductor portion 25a. A high-frequency current flows through the first non-feeding conductor portion 32 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The second non-feeding conductor portion 33 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and is located on the opposite side of the first non-feeding conductor portion 32 with the unbalanced feeding material 11 (non-feeding portion 21) interposed therebetween. At the same time, it is located between the unbalanced feeding material 11 (non-feeding portion 21) and the second ground conductor portion 25b, and is separated outward in the radial direction of the unbalanced feeding material 11 and the diameter of the second ground conductor portion 25b. Separated inward in the direction. The base end of the second non-feeding conductor portion 33 is connected to the first non-feeding fixing portion 31, and is axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. It is extending. The second passive conductor portion 33 has an axial length L5 of λ / 8 to λ / 16. The second non-feeding conductor portion 33 is parallel to the second ground conductor portion 25b. A high-frequency current flows through the second non-feeding conductor portion 33 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction).

The first non-feeding conductor portion 32 and the second non-feeding conductor portion 33 have a line symmetry (plane symmetry) with respect to the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11. The cross-sectional shapes of the above are the same (same shape and the same size), and their axial lengths L5 are the same. Further, the radial distance dimension L6 of the first non-feeding conductor portion 32 (inner edge) from the central axis S1 (center of the feeding portion 21) of the unbalanced feeding material 11 and the second non-feeding conductor portion 33 (inner edge). The radial separation dimension L6 is the same. In the first non-feeding element 15, the length obtained by adding the axial length L5 of the first non-feeding conductor portion 32 to the axial length L5 of the second non-feeding conductor portion 33 is λ / 4.

The power feeding element 16 is made of a conductive metal (aluminum, copper, alloy, etc.) and is formed into a thin plate having a predetermined area. The feeding element 15 is positioned (separated) in the axially forward direction of the resonance conductor 12 (first resonance conductor portion 22a and second resonance conductor portion 22b), and is located at the front end portion 34 of the unbalanced feeding material 11 (feeding portion 20). It is installed facing each other. The power feeding element 16 is formed of a power feeding fixing portion 35, a first feeding conductor portion 36, and a second feeding conductor portion 37. The power feeding fixing portion 15 (feeding fixing portion 35, first feeding conductor portion 36, second feeding conductor portion 37) is joined (fixed) to the other surface 48 (lower surface) of the dielectric substrate 47, and the feeding fixing portion 135 is joined. It is electrically connected to the unbalanced feeding material 11 (the first conductor 17 (center metal conductor) of the feeding portion 20).

The first feeding conductor portion 36 is formed into a thin plate having a predetermined area long in the radial direction, and is positioned (separated) in the axially forward direction of the resonance conductor 12 (the first resonance conductor portion 22a and the second resonance conductor portion 22b). , It extends radially outward from the power feeding fixing portion 35 (front end portion 34 of the unbalanced feeding material 11). The first feeding conductor portion 36 resonates with the first resonance conductor portion 22a of the resonance conductor 12. The second feeding conductor portion 37 is formed into a thin plate having a predetermined area long in the radial direction, and is positioned (separated) in the axially forward direction of the resonance conductor 12 (the first resonance conductor portion 22a and the second resonance conductor portion 22b). , It extends radially outward from the power feeding fixing portion 35 (front end portion 34 of the unbalanced feeding material 11). The second feeding conductor portion 37 resonates with the second resonance conductor portion 22b of the resonance conductor 12. The first feeding conductor portion 36 and the second feeding conductor portion 37 have a line-symmetrical relationship with respect to the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material 11, and their planar shapes are the same (same as above). They are the same size) and their areas are the same.

FIG. 13 is a perspective view of the wideband antenna 10F shown as another example. In FIG. 13, the axial direction is indicated by an arrow X, the radial direction is indicated by an arrow Y, the axial front is indicated by an arrow X1, and the axial rear is indicated by an arrow X2. The wideband antenna 10F of FIG. 13 differs from that of FIG. 10 in that it has a second non-feeding element 41, and the other configurations are the same as those of the wideband antenna 10E of FIG. By adding reference numerals and referring to the description of the wideband antenna 10E of FIG. 10, the description of other configurations of the wideband antenna 10F will be omitted.

The wideband antenna 10F includes an unbalanced feeding material 11 (coaxial cable or semi-rigid cable), a resonance conductor 12, a ground conductor 13, a fixing conductor 14, a first non-feeding element 15, a second non-feeding element 41, and a feeding element 16. It is formed from and. The unbalanced feeding material 11, the resonance conductor 12, the ground conductor 13, the fixing conductor 14, the first non-feeding element 15, and the feeding element 16 are the same as those of the wideband antenna 10E of FIG.

The first non-feeding fixing portion 31 of the first non-feeding element 15 is formed into a rectangular thin plate having a predetermined area and long in the radial direction, and is located between the first ground conductor portion 25a and the second ground conductor portion 25b. , Is fixed (connected) to the unbalanced feeding material 11 (second conductor 19 (outer metal conductor) of the non-feeding portion 21) by welding (soldering or the like) (fixing means), and the unbalanced feeding material 11 (non-feeding portion 21) It is electrically connected to the second conductor 19 (outer metal conductor) of the above. The first non-feeding fixing portion 31 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47.

The first non-feeding conductor portion 32 of the first non-feeding element 15 is formed into a rectangular thin plate shape having a predetermined area long in the axial direction, and the unbalanced feeding material 11 (non-feeding portion 21) and the rectangular thin plate-shaped first ground conductor. It is located between the portion 25a and is separated radially outward of the unbalanced feeding material 11 and is separated radially inward of the first ground conductor portion 25a so as to be separated from the unbalanced feeding material 11 in the non-feeding portion 21. In parallel, it extends forward in the axial direction from the first non-feeding fixing portion 31. The first non-feeding conductor portion 32 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The first non-feeding conductor portion 32 is parallel to the rectangular thin plate-shaped first ground conductor portion 25a. A high-frequency current flows through the first non-feeding conductor portion 32 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The second non-feeding conductor portion 33 of the first non-feeding element 15 is formed into a rectangular thin plate having a predetermined area long in the axial direction, and the first non-feeding conductor portion sandwiches the unbalanced feeding material 11 (non-feeding portion 21). It is located on the opposite side of 32, and is located between the unbalanced feeding material 11 (non-feeding portion 21) and the rectangular thin plate-shaped second ground conductor portion 25b, and is separated outward in the radial direction of the unbalanced feeding material 11. At the same time, the second ground conductor portion 25b is separated inward in the radial direction. The second non-feeding conductor portion 33 extends axially forward from the first non-feeding fixing portion 31 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The second non-feeding conductor portion 33 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The second non-feeding conductor portion 33 is parallel to the parallel portion of the rectangular thin plate-shaped second ground conductor portion 25b. A high-frequency current flows through the second non-feeding conductor portion 33 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction).

The second non-feeding element 41 is made of a conductive metal (aluminum, copper, alloy, etc.), and is between the first ground conductor portion 25a and the second ground conductor portion 25b, and is the shaft of the first non-feeding element 15. It is located forward in the direction and faces the first non-feeding element 15. The second non-feeding element 41 is formed of a second non-feeding fixing portion 42, a third non-feeding conductor portion 43, and a fourth non-feeding conductor portion 44. In the second non-feeding element 41, the second non-feeding fixing portion 42, the third non-feeding conductor portion 43, and the fourth non-feeding conductor portion 44 are integrally formed. The second non-feeding fixing portion 42 is formed into a rectangular thin plate shape having a predetermined area long in the radial direction, and is located between the rectangular thin plate-shaped first ground conductor portion 25a and the rectangular thin plate-shaped second ground conductor portion 25b. ing. The second non-feeding fixing portion 42 is fixed (connected) to the unbalanced feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21) by welding (soldering or the like) (fixing means), and is unbalanced. It is electrically connected to the feeding material 11 (the second conductor 19 (outer metal conductor) of the non-feeding portion 21). The second non-feeding fixing portion 42 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47.

The third non-feeding conductor portion 43 of the second non-feeding element 41 is formed into a rectangular thin plate shape having a predetermined area long in the axial direction, and the unbalanced feeding material 11 (non-feeding portion 21) and the rectangular thin plate-shaped first ground conductor. Although it is located between the portion 25a and the first non-feeding conductor portion 32, it is located axially forward of the first non-feeding conductor portion 32, is separated outward in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21), and is separated from the first ground conductor. The portions 25a are separated inward in the radial direction. The third non-feeding conductor portion 43 extends axially rearward from the second non-feeding fixing portion 42 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The third non-feeding conductor portion 43 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The third passive conductor portion 43 is parallel to the rectangular thin plate-shaped first ground conductor portion 25a. A high-frequency current flows through the third non-feeding conductor portion 43 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the first ground conductor portion 25a (one in the axial direction).

The fourth non-feeding conductor portion 44 of the second non-feeding element 41 is located on the opposite side of the third non-feeding conductor portion 43 with the unbalanced feeding material 11 (non-feeding portion 21) interposed therebetween, and the unbalanced feeding material 11 It is located between the (non-feeding portion 21) and the second ground conductor portion 25b, and is located in front of the second non-feeding conductor portion 33 in the axial direction. The fourth non-feeding conductor portion 44 is separated in the radial direction of the unbalanced feeding material 11 (non-feeding portion 21) and inward in the radial direction of the second ground conductor portion 25b. The fourth non-feeding conductor portion 44 extends axially rearward from the second non-feeding fixing portion 342 in parallel with the non-feeding portion 21 of the unbalanced feeding material 11. The fourth passive conductor portion 44 is joined (fixed) to one surface 48 (upper surface) of the dielectric substrate 47. The fourth passive conductor portion 44 is parallel to the rectangular thin plate-shaped second ground conductor portion 25b. A high-frequency current flows through the fourth non-feeding conductor portion 44 in the direction opposite to the direction (one in the axial direction) of the high-frequency current flowing in the second ground conductor portion 25b (one in the axial direction).

In the wideband antenna 10F, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8 to λ / 16, and the third non-feeding conductor The axial length L7 of the portion 43 and the axial length L7 of the fourth non-feeding conductor portion 44 are λ / 8 to λ / 16. The axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 8, and the axial length L7 of the third non-feeding conductor portion 43. And when the axial length L7 of the fourth non-feeding conductor portion 44 is λ / 8, the length L5 of the first non-feeding conductor portion 32 plus the length L5 of the second non-feeding conductor portion 33 is added. (2 × L5) is λ / 4, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ / 4. Is. Further, the axial length L5 of the first non-feeding conductor portion 32 and the axial length L5 of the second non-feeding conductor portion 33 are λ / 16, and the axial length of the third non-feeding conductor portion 43. When the axial length L7 of the L7 and the fourth non-feeding conductor portion 44 is λ / 16, the length L5 of the second non-feeding conductor portion 33 is added to the length L5 of the first non-feeding conductor portion 32. The length (2 × L5) is λ / 8, and the length (2 × L7) obtained by adding the length L7 of the third non-feeding conductor portion 43 to the length L7 of the fourth non-feeding conductor portion 44 is λ. / 8, and the axial lengths (2 × L5) of the first and second non-feeding conductors 32 and 33 and the axial lengths (2 ×) of the third and fourth non-feeding conductors 43 and 44. The length to which L7) is added is λ / 4.

In the wideband antenna 10F, the front end 45 of the first non-feeding conductor portion 32 of the first non-feeding element 15 is slightly separated axially rearward from the rear end 46 of the third non-feeding conductor portion 43 of the second non-feeding element 41. A clearance (slight gap) is formed between the front end 45 of the first non-feeding conductor portion 32 and the rear end 46 of the third non-feeding conductor portion 43). The front end 45 of the second non-feeding conductor portion 33 of the first non-feeding element 15 is slightly separated axially rearward from the rear end 46 of the fourth non-feeding conductor portion 44 of the second non-feeding element 41 (range of 1 to 5 mm). ), And there is a clearance (slight gap) between the front end 45 of the second non-feeding conductor portion 33 of the first non-feeding element 15 and the rear end 46 of the fourth non-feeding conductor portion 44 of the second non-feeding element 41. It is formed.

Similar to the wideband antenna 10D of FIG. 8, the first non-feeding conductor portion and the third non-feeding conductor portion are in a state where the first non-feeding conductor portion is on the top and the third non-feeding conductor portion is on the bottom. The second non-feeding conductor portion and the fourth non-feeding conductor portion are arranged in a state where the second non-feeding conductor portion is on the top and the fourth non-feeding conductor portion is on the bottom. The wideband antennas may be arranged so as to be separated from each other in the thickness direction. In this case, an insulator is interposed between the first non-feeding conductor portion and the third non-feeding conductor portion, and an insulator is interposed between the second non-feeding conductor portion and the fourth non-feeding conductor portion.

The wideband antennas 10A to 10F include the axial lengths L1 of the first and second resonant conductors 22a and 22b of the resonance conductor 12 with respect to the feeding portion 20 of the unbalanced feeding material 11 and the non-feeding portion of the unbalanced feeding material 11. The axial length L3 of the first and second ground conductor portions 15a and 15b of the ground conductor 13 with respect to 21 can be freely set. In the wideband antennas 10A to 10F, only the lengths L1 of the first and second resonant conductors 22a and 22b with respect to the feeding portion 20 can be changed, and the first and second ground conductors 25a and 25b with respect to the non-feeding portion 21 can be changed. Only the length L3 of the can be changed, and both the lengths L1 and L3 can be changed.

To change the axial lengths L1 of the first and second resonant conductors 22a and 22b with respect to the feeding conductor 20, the lengths of the first and second resonant conductors 22a and 22b of the resonant conductor 12 are changed. , The fixing position of the fixing conductor 14 with respect to the unbalanced feeding material 11 may be moved forward in the axial direction or rearward in the axial direction, or both of them may be used in combination. To change the axial lengths L3 of the first and second ground conductors 25a and 25b with respect to the non-feeding portion 21, the lengths of the first and second ground conductors 25a and 25b of the ground conductor 13 are changed. In this case, the fixing position of the fixing conductor 14 with respect to the unbalanced feeding material 11 may be moved to the front in the axial direction or the rear in the axial direction, or both of them may be used in combination.

The wideband antennas 10A to 10F have axial lengths L1 of the first and second resonant conductors 22a and 22b with respect to the feeding portion 20 and axial lengths of the first and second ground conductors 25a and 25b with respect to the non-feeding portion 21. By changing the lengths L1 and L3 of at least one of the lengths L3, the specific band (used frequency band) can be freely moved to the higher side and the lower side. For example, when the length L1 is made longer than that shown in the figure, the resonance point between the feeding portion 20 and the resonance conductor 12 moves to the higher side, thereby moving the specific band of the antennas 10A to 10F to the higher side (higher). Can be made to. On the contrary, when the length dimension L1 is shorter than that shown in the drawing, the resonance wavelength between the feeding portion 20 and the resonance conductor 12 becomes longer, and the specific band of the antennas 10A to 10F can be moved to the lower side (lower). .. Further, when the length L3 is made longer than that shown in the drawing, the resonance wavelength between the non-feeding portion 21 and the ground conductor 13 becomes longer, and the specific band of the antennas 10A to 10F can be moved to the lower side (lower). .. On the contrary, when the length L3 is made shorter than that shown in the figure, the resonance point between the non-feeding portion 21 and the ground conductor 13 moves to the higher side, whereby the specific band of the antennas 10A to 10F moves to the higher side (higher). Can be moved.

In the wideband antennas 10A to 10F, the size (area) of the first and second feeding conductors 36 and 37 of the feeding element 16 is increased, so that the feeding portion 20 of the unbalanced feeding material 11 and the resonance conductor 12 are the first. The movement of the resonance point with the 1st and 2nd resonance conductor portions 22a and 22b to a higher position is increased, and the size (area) of the 1st and 2nd feeding conductor portions 36 and 37 of the feeding element 16 is reduced. The movement of the resonance point between the feeding portion 20 of the unbalanced feeding material 11 and the first and second resonance conductor portions 22a and 22b of the resonance conductor 12 to a higher position is reduced.

In the wideband antennas 10A to 10F, the size (area) of the first and second feeding conductors 36 and 37 of the feeding element 16 is increased, so that the feeding portion 20 of the unbalanced feeding material 11 and the resonance conductor 12 are the first. The resonance points with the 1st and 2nd resonance conductors 22a and 22b can be largely moved to a higher position, and the size (area) of the 1st and 2nd feeding conductors 36 and 37 of the feeding element 16 can be reduced. The resonance point between the feeding portion 20 of the unbalanced feeding material 11 and the first and second resonance conductor portions 22a and 22b of the resonance conductor 12 can be moved to a higher position, and the movement to a higher position of the specific band can be made fine. Can be adjusted.

The wideband antennas 10A to 10F have a radial separation dimension between the central axis S1 (center of the feeding portion 20) of the unbalanced feeding material 11 and the first and second resonance conductor portions 22a and 22b (inner edges) of the resonance conductor 12. L2 is in the range of 2-9 mm. If the separation dimension L2 is less than 2 mm, the resonance between the feeding portion 20 of the unbalanced feeding material 11 and the first and second resonance conductor portions 22a and 22b becomes insufficient, and a plurality of resonance frequencies cannot be obtained, and the antenna. The frequency band that can be used in 10A to 10F cannot be expanded. When the separation dimension L2 exceeds 9 mm, the specific band (frequency band used) of the wideband antennas 10A to 10F is saturated in the widest state, and the specific band of the antennas 10A to 10F cannot be further widened. If L2 is made too large, the resonance between the feeding portion 20 of the unbalanced feeding material 11 and the first and second resonance conductor portions 22a and 22b becomes unstable in the frequency band, and the feeding portion 20 of the unbalanced feeding material 11 becomes unstable. And the first and second resonance conductor portions 22a and 22b may not be able to resonate.

By changing the separation dimension L2 in the above range, the wide band antennas 10A to 10F can freely adjust the width of the specific band (used frequency band) of the antennas 10A to 10F, and stabilize the resonating frequency band. be able to. Specifically, by increasing the separation dimension L2, the specific band can be widened, and by decreasing the separation dimension L2, the specific band can be narrowed and the VSWR in the resonance band can be stabilized. .. In the wideband antennas 10A to 10F, the specific band widens steeply as the separation dimension L2 increases from 2 mm, the specific band becomes the widest at the separation dimension L2 of 9 mm, and even if the separation dimension L2 becomes larger than that. The specific band of the antennas 10A to 10F is substantially constant. In the wideband antennas 10A to 10F, by setting the separation dimension L2 in the range of 2 to 9 mm, the resonance efficiency of the radio waves between the feeding portion 20 and the first and second resonant conductor portions 22a and 22b becomes optimum, and the feeding portion 20 and The first and second resonance conductor portions 22a and 22b can be efficiently resonated, and the specific band of the antennas 10A to 10F can be significantly widened.

The wideband antennas 10A to 10F have a distance L4 between the central axis S1 (center of the non-feeding portion 21) of the unbalanced feeding material 11 and the first and second ground conductor portions 25a and 25b (inner edges) of 3 to 3. It is in the range of 10 mm. In the antennas 10A to 10F, the separation dimension L4 is made larger than the separation dimension L2, or the separation dimension L4 is made the same as the separation dimension L2. If the separation dimension L4 is less than 3 mm, the resonance between the non-feeding portion 21 of the unbalanced feeding material 11 and the first and second ground conductor portions 25a and 25b becomes insufficient, and a plurality of resonance frequencies cannot be obtained. The frequency band that can be used in the antennas 10A to 10F cannot be expanded. When the separation dimension L4 exceeds 10 mm, the usable frequency band of the antennas 10A to 10F is saturated in the widest state, and not only the frequency band of the antennas 10A to 10F cannot be further expanded, but also the separation dimension L4 is increased. If it is excessive, the resonance between the non-feeding portion 21 of the unbalanced feeding material 11 and the first and second ground conductors 25a and 25b becomes unstable in the frequency band, and the feeding portion 21 and the first and second ground conductors 11 of the unbalanced feeding material 11 become unstable. It may not be possible to resonate the 1st and 2nd ground conductors 25a and 25b.

The wide band antennas 10A to 10F can freely adjust the width of the specific band (used frequency band) of the antennas 10A to 10F by changing the separation dimension L4 in the above range, and stabilize the resonating frequency band. be able to. Specifically, by increasing the separation dimension L4, the specific band can be widened, and by decreasing the separation dimension L4, the specific band can be narrowed and the VSWR in the resonance band can be stabilized. .. In the wideband antennas 10A to 10F, the specific band widens steeply as the separation dimension L4 increases from 3 mm, the specific band becomes the widest at the separation dimension L4 of 10 mm, and even if the separation dimension L4 becomes larger than that. The specific band of the antennas 10A to 10F is substantially constant. In the wideband antennas 10A to 10F, the resonance efficiency of the radio waves between the non-feeding portion 21 and the first and second ground conductors 25a and 25b is optimized by setting the separation dimension L4 in the range of 3 to 10 mm, and the non-feeding portion The 21 and the first and second ground conductor portions 25a and 25b can be efficiently resonated, and the specific band of the antennas 10A to 10F can be significantly widened.

In the wideband antennas 10A to 10F, the separation dimensions L2 and L4 are in the above range, and a high frequency current is induced in the first and second resonance conductor portions 22a and 22b and the feeding portion 20, and the first and second resonance conductor portions 22a , 22b and the power feeding unit 20 flow in the axial direction, and high frequency currents are induced in the first and second ground conductor portions 25a, 25b and the non-feeding unit 21, and the first and second ground conductor portions 25a, A high-frequency current flows in the axial direction between the 25b and the non-feeding portion 21, and the first and second resonant conductors 22a and 22b (resonant conductor 12) and the feeding portion 20 of the unbalanced feeding material 11 are the conductors 22a, The axial high-frequency current induced in 22b and the power feeding unit 20 resonates efficiently and reliably, and the first and second ground conductors 25a and 25b (ground conductor 13) and the unbalanced power feeding material 11 are not fed. A plurality of resonance frequencies are obtained by the parts 21 efficiently and surely resonating with the high-frequency currents in the axial direction induced in the conductor parts 25a and 25b and the non-feeding part 21, and the obtained plurality of resonance frequencies are obtained. Are adjacent to each other continuously in one direction, and some of their resonance frequencies overlap.

In the broadband antennas 10A to 10F, a high-frequency current flows in the axial direction of the first feeding conductor portion 36 of the feeding element 16, a high-frequency current flows in the axial direction of the second feeding conductor portion 37 of the feeding element 16, and the first feeding element 15 1 The feeding conductor portion 36 and the first resonant conductor portion 22a of the resonance conductor 12 resonate with the axial high-frequency current induced in the conductor portions 22a and 36, and also with the second feeding conductor portion 37 of the feeding element 16. The second resonance conductor portion 22b of the resonance conductor 12 resonates with the axial high-frequency current induced in the conductor portions 22b and 37, so that the frequency band to be resonated is stabilized.

In the wideband antennas 10A, 10C, 10E, a high-frequency current is induced in the first ground conductor portion 25a, a high-frequency current flows in one of the axial directions of the first ground conductor portion 25a, and the high-frequency current extends in the axial direction of the first non-feeding element 15. 1 A high-frequency current is induced in the non-feeding conductor portion 32, a high-frequency current flows to the other axial direction of the first non-feeding conductor portion 32, and the high-frequency current flowing in the first ground conductor portion 25a flows through the first non-feeding conductor portion 32. Since the high-frequency current flows in the direction opposite to the direction (one in the axial direction) (the other in the axial direction), the high-frequency current flowing in one of the axial directions of the first ground conductor portion 25b and the other in the axial direction of the first non-feeding conductor portion 32. The high-frequency current flowing to cancels each other out.

In the broadband antennas 10A, 10C, 10E, a high-frequency current is induced in the second ground conductor portion 25b, a high-frequency current flows in one of the axial directions of the second ground conductor portion 25b, and the high-frequency current extends in the axial direction of the second non-feeding element 15. 2 A high-frequency current is induced in the non-feeding conductor portion 33, a high-frequency current flows in the axial direction of the second feeding conductor portion 33, and the direction of the high-frequency current flowing in the second ground conductor portion 25b in the second non-feeding conductor portion 33. Since the high-frequency current flows in the direction opposite to (one in the axial direction) (the other in the axial direction), the high-frequency current flowing in one of the axial directions of the second ground conductor portion 25b and the other in the axial direction of the second non-feeding conductor portion 33 The high-frequency current that flows cancels each other out.

In the broadband antennas 10B, 10D, and 10F, a high-frequency current is induced in the first ground conductor portion 25a, a high-frequency current flows in one of the axial directions of the first ground conductor portion 25a, and the high-frequency current extends in the axial direction of the first non-feeding element 15. 1 A high-frequency current is induced in the non-feeding conductor portion 32, and a high-frequency current flows in the other axial direction of the first non-feeding conductor portion 32, and at the same time, the third non-feeding conductor portion 43 extending in the axial direction of the second non-feeding element 41 A high-frequency current is induced and a high-frequency current flows to the other side in the axial direction of the third non-feeding conductor portion 43, and the high-frequency current flowing through the first ground conductor portion 25a in the first non-feeding conductor portion 32 and the third non-feeding conductor portion 43. Since the high-frequency current flows in the direction opposite to the direction of (one in the axial direction) (the other in the axial direction), the high-frequency current flowing in one of the axial directions of the first ground conductor portion 25a and the axial direction of the first non-feeding conductor portion 32. The high-frequency current flowing to the other cancels each other, and the high-frequency current flowing in one axial direction of the first ground conductor portion 25a and the high-frequency current flowing in the other axial direction of the third non-feeding conductor portion 43 cancel each other out.

In the broadband antennas 10B, 10D, and 10F, a high-frequency current is induced in the second ground conductor portion 25b, a high-frequency current flows in one of the axial directions of the second ground conductor portion 25b, and the high-frequency current extends in the axial direction of the first non-feeding element 15. 2 A high-frequency current is induced in the non-feeding conductor portion 33, and a high-frequency current flows in the other axial direction of the second non-feeding conductor portion 33, and at the same time, in the fourth non-feeding conductor portion 44 extending in the axial direction of the second non-feeding element 41. A high-frequency current is induced and a high-frequency current flows to the other side in the axial direction of the third non-feeding conductor portion 44, and the high-frequency current flowing through the second ground conductor portion 25b in the second non-feeding conductor portion 33 and the fourth non-feeding conductor portion 44. Since the high-frequency current flows in the direction opposite to the direction of (one in the axial direction) (the other in the axial direction), the high-frequency current flowing in one of the axial directions of the second ground conductor portion 25b and the axial direction of the second non-feeding conductor portion 33. The high-frequency current flowing to the other cancels each other, and the high-frequency current flowing in one axial direction of the second ground conductor portion 25b and the high-frequency current flowing in the other axial direction of the fourth non-feeding conductor portion 44 cancel each other out.

FIG. 14 is a diagram showing the correlation between VSWR (voltage standing wave ratio) and the band used in the wideband antennas 10A to 10F, and FIG. 15 is a Smith chart showing the impedance of the wideband antennas 10A to 10F. 16 and 17 are diagrams showing the electric field strength measured in the circumferential direction of the three planes (XY plane, YZ plane, ZX plane) of the wideband antennas 10A to 10F. FIG. 16 shows the measurement results of the electric field strength in the circumferential direction (0 ° to 360 °) of the XY plane antenna characteristic, and FIG. 17 shows the electric field in the circumferential direction (0 ° to 360 °) of the YZ plane or ZX plane antenna characteristic. The measurement result of the strength is shown.

As shown in FIG. 14, the wideband antennas 10A to 10F have a reflection coefficient VSWR (voltage standing wave ratio) of 2 or more and 3 or less at a specific band (use frequency band) of about 100 MHz to about 10.0 GHz, and have a low VSWR. It can be seen that it has a wide specific band while maintaining (voltage standing wave ratio). Further, as shown in FIG. 15, the impedance of the wideband antennas 10A to 10F is 50Ω, and as shown in FIG. 16, the electric field strength (radio wave strength) in the circumferential direction (0 ° to 360 °) of the XY plane antenna characteristics is A substantially perfect circle is drawn, and as shown in FIG. 17, the electric field strength (radio wave strength) in the circumferential direction (0 ° to 360 °) of the YZ plane or ZX plane antenna characteristics draws a glasses type, and the wideband antennas 10A to 10F. Has good omnidirectionality.

In the wideband antennas 10A to 10F, a high frequency current is induced in the first and second resonant conductors 22a and 22b and the feeding portion 20, and the first and second resonant conductors 22a and 22b and the feeding portion 20 are axially oriented. A high-frequency current flows, and a high-frequency current is induced in the first and second ground conductor portions 25a and 25b and the non-feeding portion 21, in the axial direction of the first and second ground conductor portions 25a and 25b and the non-feeding portion 21. A high-frequency current flows, and the first and second resonant conductors 22a and 22b and the feeding portion 20 resonate with the axially high-frequency current induced in the conductors 22a and 22b and the feeding portion 20, while the first and second resonant conductors 22a and 22b resonate with each other. The second ground conductor portions 25a and 25b and the non-feeding portion 21 resonate with each other due to the high frequency current in the axial direction induced in the conductor portions 25a and 25b and the non-feeding portion 21, and it is possible to obtain a plurality of resonance frequencies. Yes, since the obtained plurality of resonance frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap, the specific band (about 100 MHz to about 10.0 GHz) in the antennas 10A to 10F can be significantly widened. Can be done.

Wideband antennas 10A to 10F can make antennas 10A to 10F having a high radiation gain with VSWR (voltage standing wave ratio) of 2 or more and 3 or less, and can use the specific band (about 100 MHz to about 100 MHz to about). Antennas 10A to 10F that can transmit and receive radio waves in all bands of 10.0 GHz), can be used in a wide band (broadband), and can transmit and receive wide band radio waves with only one antenna. be able to.

In the wideband antennas 10A to 10F, a high-frequency current is induced in the first feeding conductor portion 36 of the feeding element 16 in which a plurality of stepped first stepped portions 39 are formed, and from the rear end to the front end of the first feeding conductor portion 36. A high-frequency current flows in the axial direction toward the axis, and a high-frequency current is induced in the second feeding conductor portion 37 of the feeding element 16 in which a plurality of stepped second step portions 40 are formed, and after the second feeding conductor portion 37. A high-frequency current flows in the axial direction from the end to the front end, and the plurality of first step portions 39 of the first feeding conductor portion 36 and the first resonance conductor portion 22a of the resonance conductor 12 are connected to the conductor portions 22a and 36. A plurality of resonances are caused by the induced axial high-frequency current, and the plurality of second step portions 40 of the second feeding conductor portion 37 and the second resonance conductor portion 22b of the resonance conductor 12 are induced in the conductor portions 22b and 37. A plurality of resonance frequencies are resonated by the high-frequency current in the axial direction, and a plurality of resonance frequencies having strong electric field strengths (radio field strengths) having different bands can be obtained by the resonance of the conductor portions 22a, 22b, 36, and 37. It is possible to send a wide band radio wave over a wide range and far away (increase the radiation gain) while maintaining the strength, and of course, the first of the feeding element 16 in which a plurality of first and second stepped portions 39 and 40 are formed. By resonating the second feeding conductors 36 and 37 with the first and resonance conductors 22a and 22b of the resonance conductor 12, the resonating frequency band can be stabilized, and the metal near the antennas 10A to 10F. Even if an obstacle made of a conductor such as the above is close to or present, the resonance point of the antennas 10A to 10F does not fluctuate, the change of the frequency band of the antennas 10A to 10F can be prevented, and the high frequency current is converted into a radio wave. The conversion efficiency can be maintained, and radio waves in the frequency band as designed can be transmitted and received.

In the broadband antennas 10A, 10C, and 10E shown in FIGS. 1, 5, and 10, a high-frequency current is induced in the first ground conductor portion 25a, and a high-frequency current flows in one of the axial directions of the first ground conductor portion 25a. A high-frequency current is induced in the non-feeding conductor portion 32, and a high-frequency current flows in the other axial direction of the first non-feeding conductor portion 32. The high-frequency current flowing in the other axial direction of 32 cancels each other, the high-frequency current is induced in the second ground conductor portion 25b, the high-frequency current flows in one axial direction of the second ground conductor portion 25b, and the second non-feeding conductor portion 33 A high-frequency current is induced in the second non-feeding conductor portion 33, and a high-frequency current flows to the other axial direction of the second non-feeding conductor portion 33. Since the high-frequency current flowing to the current cancels out, the unnecessary current is canceled, the radiation gain in the antennas 10A, 10C, and 10E is improved, and the vibration direction of the electric field is linearly biased parallel to the axial direction of the antennas 10A, 10C, 10E. It is possible to generate an electromagnetic field with strong waves, and the antennas 10A, 10C, and 10E with high radiation gain can be used, and a wide band of radio waves can be spread over a wide range while maintaining a predetermined electric current strength (radio strength). It can fly far away (increase the radiation gain).

In the broadband antennas 10B, 10D, and 10F shown in FIGS. 4, 8, and 13, a high-frequency current is induced in the first ground conductor portion 25a, and a high-frequency current flows in one of the axial directions of the first ground conductor portion 25a. A high-frequency current is induced in the non-feeding conductor portion 32 to cause a high-frequency current to flow to the other axial direction of the first non-feeding conductor portion 32, and a high-frequency current is induced in the third non-feeding conductor portion 43 to induce a high-frequency current in the third non-feeding conductor portion 32. A high-frequency current flows in the other axial direction of 43, and a high-frequency current flowing in one axial direction of the first ground conductor portion 25a and a high-frequency current flowing in the other axial direction of the first non-feeding conductor portion 32 and the third non-feeding conductor portion 43. Cancel each other, a high-frequency current is induced in the second ground conductor portion 25b, a high-frequency current flows in one of the axial directions of the second ground conductor portion 25b, and a high-frequency current is induced in the second non-feeding conductor portion 33. A high-frequency current flows to the other axial direction of the feeding conductor portion 33, a high-frequency current is induced in the fourth non-feeding conductor portion 44, and a high-frequency current flows to the other axial direction of the fourth non-feeding conductor portion 44, and the second ground conductor Since the high-frequency current flowing in one axial direction of the portion 25b and the high-frequency current flowing in the other axial direction of the second non-feeding conductor portion 33 and the fourth non-feeding conductor portion 44 cancel each other out, the unnecessary current is canceled and the antenna 10B is canceled. , 10D, 10F, the radiation gain is improved, the vibration direction of the electric current can generate a strong electromagnetic field with linear polarization parallel to the axial direction of the antennas 10B, 10D, 10F, and the antenna 10B with high radiation gain. , 10D, 10F, and a wide band radio wave can be sent over a wide range (increasing the radiation gain) while maintaining a predetermined electric current strength (radio strength).

In the wideband antennas 10E and 10F shown in FIGS. 9 and 12, the first and second resonant conductor portions 22a joined to the dielectric substrate 47 by the dielectric substrate 47 having a predetermined dielectric constant functioning as a capacitance. , 22b and the feeding portion 20 easily resonate with the axial high-frequency current induced in the 22a, 22b and the feeding portion 20, and the first and second ground conductor portions 25a joined to the dielectric substrate 47. , 25b and the non-feeding portion 21 resonate with the conductor portions 25a, 25b and the high-frequency current in the axial direction induced in the non-feeding portion 21, and it is possible to obtain a plurality of resonance frequencies. Since the resonance frequencies are continuously adjacent to each other in one direction and some of the resonance frequencies overlap with each other, the specific band (used frequency band) of the antennas 10E and 10F can be significantly widened.

10A Broadband Antenna 10B Broadband Antenna 10C Broadband Antenna 10D Broadband Antenna 10E Wideband Antenna 10F Wideband Antenna 11 Unbalanced Feeding Material 12 Resonant Conductor 13 Ground Conductor 14 Fixing Conductor 15 First Non-feeding Element 16 Feeding Element 17 First Conductor 18th 1 Insulator 19 2nd conductor 20 Feeding part 21 Non-feeding part 22a 1st resonance conductor part 22b 2nd resonance conductor part 23 Parallel part 24 Extending part 25a 1st ground conductor part 25b 2nd ground conductor part 26a Inclined part 26b Inclined Part 27a Straight part 27b Straight part 28 Parallel part 29 Extension part 30 Connector 31 1st non-feeding fixing part 32 1st non-feeding conductor part 33 2nd non-feeding conductor part 34 Front end part 35 Power feeding fixing part 36 1st feeding Conductor part 37 2nd feeding conductor part 38 Rear end part 39 1st step part 40 2nd step part 41 2nd non-feeding element 42 2nd non-feeding fixing part 43 3rd non-feeding conductor part 44 4th non-feeding conductor part 45 Front end 46 Rear end 47 Dielectric substrate 48 One side (upper surface)
49 The other side (bottom surface)
L1 Axial length L2 Axial distance L3 Axial length L4 Axial distance L5 Axial length L6 Axial distance L7 Axial length L8 Axial distance S1 Center Axis

Claims (12)

For resonance between an unbalanced feeding material having a feeding portion having a predetermined length and a non-feeding portion having a predetermined length connected to the feeding portion and extending axially rearward from the feeding portion, and a feeding portion of the unbalanced feeding material. It is located between the conductor, the ground conductor that resonates with the non-feeding portion of the unbalanced feeding material, and the resonance conductor and the ground conductor, and is electrically connected to the unbalanced feeding material via a fixing means. First resonance It is located on the opposite side of the first resonance conductor portion with the conductor portion and the unbalanced feeding material sandwiched between them, and is separated outward in the radial direction of the unbalanced feeding material, and is used for fixing in parallel with the feeding portion. It is formed from a second resonance conductor portion extending forward in the axial direction from the conductor, and the ground conductor is separated radially outward of the unbalanced feeding material and is used for fixing in parallel with the non-feeding portion. The first ground conductor portion extending axially rearward from the conductor is located on the opposite side of the first ground conductor with the unbalanced feeding material interposed therebetween, and is separated outward in the radial direction of the unbalanced feeding material. A broadband antenna characterized in that it is formed from a second ground conductor portion extending rearward in the axial direction from the fixing conductor in parallel with the non-feeding portion. The broadband antenna has a first non-feeding element located between the first ground conductor portion and the second ground conductor portion, and the first non-feeding element provides fixing means to the unbalanced feeding material. It is located between the first non-feeding fixing portion electrically connected via the unbalanced feeding material and the unbalanced feeding material and the first ground conductor portion, and is separated outward in the radial direction of the unbalanced feeding material and described above. The first non-feeding conductor portion extending axially forward from the first non-feeding fixed portion in parallel with the non-feeding portion while being separated inward in the radial direction of the first ground conductor portion, and the unbalanced feeding material. It is located between the second ground conductor portion and is parallel to the non-feeding portion while being separated radially outward of the unbalanced feeding material and radially inward of the second ground conductor portion. The wideband antenna according to claim 1, further comprising a second non-feeding conductor portion extending axially forward from the first non-feeding fixed portion. The first resonance conductor portion and the second resonance conductor portion of the resonance conductor are in a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material, and the first ground conductor portion and the second ground conductor portion of the ground conductor are in a line-symmetrical relationship. The ground conductor portion has a line-symmetrical relationship with the central axis of the unbalanced feeding material, and the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are in the unbalanced relationship. The wideband antenna according to claim 1 or 2, which has a line-symmetrical relationship with respect to the central axis of the feeding material. In the wideband antenna, any one of claims 1 to 3 in which the axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the first non-feeding element are λ / 8 to λ / 16. Wideband antenna described in. The wideband antenna is located between the first ground conductor portion and the second ground conductor portion in the axially forward direction of the first non-feeding element, and faces the first non-feeding element. A second non-feeding fixing portion having a feeding element, the second non-feeding element being electrically connected to the unbalanced feeding material via a fixing means, the unbalanced feeding material, and the first ground conductor. The second non-feeding material is located between the parts and the unbalanced feeding material in parallel with the non-feeding part while being separated in the radial direction of the unbalanced feeding material and inward in the radial direction of the first ground conductor portion. It is located between the third non-feeding conductor portion extending axially rearward from the feeding fixing portion, the unbalanced feeding material and the second ground conductor portion, and is separated outward in the radial direction of the unbalanced feeding material. A claim formed from a fourth non-feeding conductor portion extending axially rearward from the second non-feeding fixed portion in parallel with the non-feeding portion while being separated inward in the radial direction of the second ground conductor portion. The wideband antenna according to any one of items 1 to 4. The third non-feeding conductor portion and the fourth non-feeding conductor portion of the second non-feeding element have a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material, and in the broadband antenna, the first non-feeding material is used. The axial lengths of the first non-feeding conductor portion and the second non-feeding conductor portion of the feeding element are λ / 8 to λ / 16, and the third non-feeding conductor portion and the fourth non-feeding conductor portion of the second non-feeding element. The wideband antenna according to claim 5, wherein the length of the feeding conductor portion in the axial direction is λ / 8 to λ / 16. The first non-feeding conductor portion of the first non-feeding element and the third non-feeding conductor portion of the second non-feeding element are such that one of the conductor portions is on the top and the other is on the bottom. In this state, the wideband antennas are arranged so as to be separated from each other in the thickness direction, and the second non-feeding conductor portion of the first non-feeding element and the fourth non-feeding conductor portion of the second non-feeding element are the conductor portions. The wideband antenna according to any one of claims 4 to 6, wherein one of them is on the top and the other is on the bottom, and the wideband antennas are arranged so as to be separated from each other in the thickness direction of the wideband antenna. The front end of the first non-feeding conductor portion of the first non-feeding element faces slightly rearward in the axial direction from the rear end of the third non-feeding conductor portion of the second non-feeding element, and the first non-feeding element The present invention according to any one of claims 4 to 6, wherein the front end of the second non-feeding conductor portion of the second non-feeding element is slightly separated and opposed to the rear end in the axial direction from the rear end of the fourth non-feeding conductor portion of the second non-feeding element. Wideband antenna. The broadband antenna has a feeding element that is formed into a plate shape having a predetermined area and is located axially forward of the resonance conductor, and the feeding element is electrically connected to the feeding portion. A first feeding conductor portion having a predetermined area extending radially outward from the feeding fixing portion and located axially forward from the first resonance conductor portion of the resonance conductor, and a feeding conductor portion outside the radial direction from the feeding fixing portion. The wideband antenna according to any one of claims 1 to 8, further comprising a second feeding conductor portion having a predetermined area located axially forward from the second resonance conductor portion of the resonance conductor. A plurality of first stepped portions arranged in a staircase pattern from the rear end to the front end of the first feeding conductor portion are formed in the first feeding conductor portion, and the second feeding conductor portion is formed with the second feeding conductor portion. The wideband antenna according to claim 9, wherein a plurality of second step portions arranged in a staircase pattern from the rear end to the front end of the conductor portion are formed. The wideband antenna according to claim 9 or 11, wherein the first feeding conductor portion and the second feeding conductor portion of the feeding element have a line-symmetrical relationship with respect to the central axis of the unbalanced feeding material. The unbalanced feeding material includes a first conductor extending in the axial direction, an insulator covering the outer peripheral surface of the first conductor, and a second conductor covering the outer peripheral surface of the insulator and extending in the axial direction. The feeding portion of the unbalanced feeding material is formed from the first conductor, and the non-feeding portion of the unbalanced feeding material is formed from the first and second conductors and the insulator. The wideband antenna according to any one of claims 8 to 11, wherein the fixing conductor is electrically connected to the second conductor, and the feeding element is electrically connected to the first conductor.

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