JP2002100915A - Dielectric antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact dielectric antenna which can be mounted to a circuit board, and has a wide and available frequency band width. SOLUTION: An antenna element 13, which is resonant with a first frequency within a specified frequency band and of which the impedance of single feeding point is about 100 ohms, for example, and an antenna element 14 which is resonant to a second frequency different from the first frequency within the same frequency band and of which impedance of single feeding point is about 100 ohms, are laminated in a body 11 made of dielectric ceramic material, and the feeding points of the antenna elements 13 and 14 are connected with the same external terminal 12b. A dielectric antenna 10 has a structure. Therefore, the impedance of feeding point of the external terminal 12b becomes 50 ohms, and the frequency band width showing low reflection loss is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric antenna used for a portable telephone or a portable wireless communication device.

[0002]

2. Description of the Related Art In recent years, with the spread of portable telephones and portable radio communication devices, reduction in size and weight has been required. Although miniaturization of various electronic components such as semiconductor integrated circuits is rapidly progressing, it is an antenna that hinders miniaturization of wireless communication devices. As is well known, an antenna is an entrance / exit of an electromagnetic wave, and if it does not resonate with a frequency to be used, the efficiency is extremely reduced. In the case of a normal dipole antenna, it is very difficult to reduce the size because it requires a length of １ ／ wavelength of the used frequency. For this reason, various devices for miniaturizing the antenna have been proposed.

[0003] For example, in the antenna disclosed in Japanese Patent Application Laid-Open No. 10-13135, the antenna element is folded so as to be substantially parallel along the longitudinal direction to reduce the size of the antenna and to reduce the frequency of the two antennas. It is configured to resonate with the band.

In the antenna disclosed in Japanese Patent Application Laid-Open No. 10-229304, an antenna element is formed on the surface of a dielectric substrate, so that the antenna can be further miniaturized and easily mounted on a circuit board. We are devised so that we can do it.

[0005]

However, there is a demand for increased and diversified functions of portable wireless communication devices, and in order to realize this, the number of components is often increased.
For this reason, in order to reduce the size of the device, it is necessary to further reduce the size of the electronic component, and particularly to further reduce the size of the antenna.

Further, since a portable telephone uses a wide frequency band of a very high frequency band, an antenna having a usable wide frequency bandwidth is required.

In view of the above problems, an object of the present invention is to provide a small-sized dielectric antenna that can be mounted on a circuit board and used and has a wide usable frequency bandwidth.

[0008]

In order to achieve the above object, according to the present invention, there is provided a body comprising at least one dielectric layer having a conductor provided on a surface thereof, and an outer surface of the body. And at least two antenna elements formed of the conductor, and a feed point of each antenna element is connected to the external terminal, and at least two antenna elements are provided. A dielectric antenna is proposed in which the respective resonance frequencies of the antenna elements are set to different frequencies within the same frequency band.

According to the dielectric antenna, the main body is provided with two or more antenna elements, and the feeding points of each antenna are connected to the same external terminal or different external terminals. Further, at least two antenna elements are set to resonate at different frequencies within the same frequency band. For example, the frequency is set so that the reflection loss of one of the antenna elements in the frequency band is large, and the reflection loss of the other antenna element is small. Therefore, by using these two or more antenna elements, the frequency range in which the reflection loss is small in the frequency band can be expanded.

According to a second aspect of the present invention, there is provided the dielectric antenna according to the first aspect, wherein the feeding points of two or more antenna elements are connected to the same external terminal.

According to the dielectric antenna, since the feeding points of two or more antenna elements are connected to the same external terminal, the two or more antennas must be used simultaneously via the one external terminal. Can be.

According to a third aspect of the present invention, the dielectric antenna according to the first aspect includes both an antenna element having an inductive impedance at a feeding point by itself and an antenna element having a capacitive impedance at a feeding point by itself. Proposed dielectric antenna.

According to the dielectric antenna, since it has both an antenna element having an inductive impedance at a feeding point by itself and an antenna element having a capacitive impedance at a feeding point by itself,
When the feed points of these antenna elements are connected,
The reflection loss at the feed point is reduced.

According to a fourth aspect of the present invention, there is provided the dielectric antenna according to the first aspect, wherein at least two antenna elements are arranged so that the radiation directions of radio waves are different.

According to the dielectric antenna, since two or more antenna elements are provided so that the radiation directions of the radio waves are different, the antenna element to be used is selected to radiate radio waves in a specific direction, or Radio waves can be emitted in a plurality of directions by using the above antenna elements simultaneously.

According to a fifth aspect of the present invention, there is provided the dielectric antenna according to the fourth aspect, wherein the dielectric antenna has two antenna elements arranged so that the radiation directions of radio waves are different by 90 degrees.

According to the dielectric antenna, at least 2
Since the two antenna elements are arranged so that the radiation directions of the radio waves are different by 90 degrees, the direction in which transmission and reception of the radio waves by one antenna element is difficult can be supplemented by the other antenna elements. As a result, deterioration of the transmission / reception state of the radio wave due to the arrangement of the dielectric antenna and the use state of the electronic device equipped with the dielectric antenna is suppressed.

According to a sixth aspect of the present invention, in the dielectric antenna according to the first aspect, at least two antenna elements in which different frequencies within a first frequency band are set as respective resonance frequencies; The present invention proposes a dielectric antenna including at least two antenna elements each having a different frequency in a second frequency band different from a band set as a resonance frequency.

According to the dielectric antenna, at least 2
One antenna element is set to resonate at different frequencies in the first frequency band, and at least two antenna elements are set to resonate at different frequencies in the second frequency band. For this reason, it is possible to set such that one of the antenna elements having the resonance frequency within the first frequency band has a large reflection loss at the antenna element and the other antenna element has a small reflection loss. By using these antenna elements having a resonance frequency in the frequency band together, the frequency range in which the return loss is small in the first frequency band can be expanded. Further, the second frequency band can be set so that one of the antenna elements having a resonance frequency within the second frequency band has a large reflection loss, and the other antenna element has a small reflection loss. By using these antenna elements having a resonance frequency in the band together, the frequency range in which the return loss is small in the second frequency band can be expanded. Therefore, transmission and reception of radio waves in two different frequency bands can be performed using one dielectric antenna.

According to a seventh aspect of the present invention, in the dielectric antenna according to the first aspect, a single feed point impedance of the antenna element whose frequency within the same frequency band is set to a resonance frequency is equal to the impedance of the antenna element. The present invention proposes a dielectric antenna in which the feeding point impedance when the feeding points are connected to each other is set to a value substantially equal to the high-frequency input / output impedance of the high-frequency circuit to be connected.

According to the dielectric antenna, since the feeding point impedance when the feeding points of the antenna elements are connected in parallel is substantially equal to the high frequency input / output impedance of the high frequency circuit, the feeding points of the antenna elements are connected in parallel. Each antenna element can be used simultaneously, and at this time, a low reflection loss can be obtained without providing an external impedance matching circuit or the like.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing a dielectric antenna according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In the figure, reference numeral 10 denotes a dielectric antenna, which is an insulating plate-like substrate (hereinafter, referred to as a dielectric ceramic material).
(Hereinafter simply referred to as a substrate) 11a, 11b, and 11c.
b, 12c are provided. Also, the substrate 11 of the intermediate layer
Conductors forming the antenna elements 13 and 14 are provided on the upper surfaces of the substrate b and the underlying substrate 11c, respectively. Although not shown, a plurality of dummy electrodes are formed on the back surface of the lowermost substrate 11c so that the electrodes can be stably soldered and fixed when mounted on the parent circuit board.

The antenna element 13 formed on the upper surface of the substrate 11b is made of strip-shaped conductors 13a to 13i, and is an element generally called an inverted-F type antenna. For example, the resonance frequency is set to 2.4 GHz. The feed point impedance is set to, for example, about 100Ω. Conductors 13b to 13g are connected to the other end of conductor 13a, one end of which is connected to external terminal 12b serving as a power supply point, in a meandering order in the order described. Conductors 13h and 13i are provided on the opposite side of the conductor 13a from the side where the conductors 13b to 13g are disposed, and one end of the conductor 13h is perpendicular to the longitudinal middle part of the conductor 13a. It is connected. Further, one end of a conductor 13i is connected to the other end of the conductor 13h at a right angle, and the other end of the conductor 13i is connected to an external terminal 12a serving as a ground terminal.

The antenna element 14 formed on the upper surface of the substrate 11c is composed of strip-shaped conductors 14a to 14i, and is an element generally called an inverted-F type antenna. For example, the resonance frequency is set to 2.5 GHz. The feed point impedance is set to, for example, about 100Ω. The conductors 14b to 14g are connected to the other end of the conductor 14a, one end of which is connected to the external terminal 12b serving as a feeding point, in a meandering manner in the order described. These conductors 14b to 14g are arranged on the side where the conductors 13h and 13i constituting the antenna element 13 are arranged. Conductors 14h and 14i are provided on opposite sides of the conductor 14a, and one end of the conductor 14h is connected at right angles to a longitudinal middle portion of the conductor 14a. Further, one end of a conductor 14i is connected at a right angle to the other end of the conductor 14h, and the other end of the conductor 14i is connected to an external terminal 12c serving as a ground terminal.

In the above-described dielectric antenna 10, since the feed points of the two antenna elements 13 and 14 are connected to the same external terminal 12b as shown in FIG. 3, the feed point impedance at the external terminal 12b generally has a high frequency. It becomes 50Ω set to the high frequency input / output impedance of the transmission / reception circuit.

As shown in FIG. 4, the reflection loss of the dielectric antenna 10 is different from that of the individual antenna elements 13 and 1.
4 are combined. For this reason, compared with the case where the individual antenna elements 13 and 14 are used alone, the frequency bandwidth showing a low return loss is widened, and the antenna can be used in a wide band. In FIG. 4, the vertical axis represents reflection loss (return loss), and one graduation thereof represents 10 dB. The horizontal axis represents frequency, and one division is 1
00 MHz. A curve A is a characteristic curve of the antenna element 13 alone in a 50Ω system, a curve B is a characteristic curve of the antenna element 14 alone in a 50Ω system, and a curve C is a characteristic curve of the dielectric antenna 11 in a 50Ω system. As described above, according to the present embodiment, as shown by the characteristic curve C, the usable bandwidth in the frequency band to be used can be expanded.

Further, since the main body 11 is formed by laminating the substrates 11a to 11c, the main body 11 can be formed in a small size, and the size of an electronic device using the dielectric antenna 10 can be reduced. it can.

Next, a second embodiment of the present invention will be described.

FIG. 5 is an exploded perspective view showing a dielectric antenna according to the second embodiment. In the figure, reference numeral 20 denotes a dielectric antenna, which is an insulating flat substrate (hereinafter simply referred to as a substrate) 21a, 21 made of a dielectric ceramic material.
It has a main body in which b, 21c, and 21d are laminated, and external terminals 22a, 22b, and 22c are provided on one side surface thereof.
The other substrates 21b to 21 except the uppermost substrate 21a
d, the antenna elements 23, 2
Conductors forming the elements 4 and 25 are provided. further,
Although not shown, a plurality of dummy electrodes are formed on the back surface of the lowermost substrate 21d so that the dummy electrodes can be stably soldered and fixed when mounted on the parent circuit board.

The antenna element 23 formed on the upper surface of the substrate 21b is composed of strip-shaped conductors 23a to 23i, and is an element generally called an inverted-F type antenna. For example, the resonance frequency is set to 2.4 GHz. The feed point impedance is set to, for example, about 150Ω. One end of the conductor 23a is connected to an external terminal 22b serving as a feeding point.
The other end is connected to conductors 23b to 23g so as to meander in a direction perpendicular to the conductor 23a in the order described. Further, the conductor 2 is located on the opposite side of the conductor 23a from the side where the conductors 23b to 23g are arranged.
3h and 23i are provided, and one end of the conductor 23h is connected to the middle part in the longitudinal direction of the conductor 23a at a right angle. Further, one end of a conductor 23i is connected to the other end of the conductor 23h at a right angle, and the other end of the conductor 23i is connected to an external terminal 22a serving as a ground terminal.

The antenna element 24 formed on the upper surface of the substrate 21c is composed of strip-shaped conductors 24a to 24f and is an element generally called a monopole antenna. For example, the resonance frequency is set to 2.45 GHz.
The feed point impedance is set to, for example, about 150Ω. The conductor 24a is arranged so as to be parallel to the conductor 23a, one end of which is connected to an external terminal 22b serving as a power supply point, and the other end of which has conductors 24b to 24f arranged in the longitudinal direction of the conductor 24a in the order described. They are connected so as to extend in a meandering manner.

The antenna element 25 formed on the upper surface of the substrate 21d is composed of strip-shaped conductors 25a to 25i, and is an element generally called an inverted-F type antenna. For example, the resonance frequency is set to 2.5 GHz. The feed point impedance is set to, for example, about 150Ω. The conductor 25a is arranged so as to be parallel to the conductor 23a, one end of which is connected to the external terminal 22b serving as a feeding point, and the other end of which has conductors 25b to 25g perpendicular to the conductor 25a in the order described. It is connected so as to extend in a meandering direction. These conductors 25b to 25g are arranged on the side where the conductors 23h and 23i constituting the antenna element 23 are arranged. The conductor 25
Conductors 25h and 25i are provided on opposite sides of a, and one end of the conductor 25h is connected at a right angle to a longitudinal middle portion of the conductor 25a. Further, one end of a conductor 25i is connected at a right angle to the other end of the conductor 25h.
The other end of i is connected to an external terminal 22c serving as a ground terminal.

In the above-described dielectric antenna 20, since the feeding points of the three antenna elements 23, 24, and 25 are connected to the same external terminal 22b, the impedance of the feeding point at the external terminal 22b is generally higher than that of the high-frequency transmitting / receiving circuit. It becomes 50Ω set to the input / output impedance.

The reflection loss of the dielectric antenna 20 is as follows.
The reflection loss of each of the antenna elements 23, 24, and 25 is combined. For this reason, compared to the case where the individual antenna elements 23, 24, 25 are used alone,
The frequency bandwidth showing low return loss is widened, and it can be used in a wide band.

Further, since the main body is formed by laminating the respective substrates 21a to 21d, the main body can be formed in a small size, and the size of an electronic device using the dielectric antenna 20 can be reduced.

Next, a third embodiment of the present invention will be described.

FIG. 6 is an exploded perspective view showing a dielectric antenna according to the third embodiment. In the drawing, reference numeral 30 denotes a dielectric antenna, which is an insulating flat substrate (hereinafter simply referred to as a substrate) 31a, 31 made of a dielectric ceramic material.
It has a main body in which b, 31c and 31d are laminated, and external terminals 32a and 32b are provided on one side surface of the main body.

A conductor forming the antenna elements 33 and 34 is provided on the upper surfaces of the substrates 31b and 31c, respectively, and a grounding conductor 35a is provided on the upper surface of the substrate 31d.
Is provided. Further, although not shown, a plurality of dummy electrodes are formed on the back surface of the lowermost substrate 31d so that the dummy electrodes can be stably soldered and fixed when mounted on the parent circuit board.

The antenna element 33 formed on the upper surface of the substrate 31b is composed of strip-shaped conductors 33a to 33i, is an element generally called an inverted F-type antenna, and has an inductive impedance at a feeding point. The resonance frequency is set to 2.4 GHz.

The conductor 33a is arranged so as to extend parallel to the side surface of the main body on which the external terminals 32a and 32b are formed, and one end thereof is connected to the external terminal 32b serving as a feeding point via the conductor 33f. I have. Further, the conductor 33
a conductors 33g, 33 connected in a U-shape
h, 33i are connected to an external terminal 32a for grounding.

The conductor 33a is connected to the other end of the conductor 33a.
b to 33e are connected so as to meander in a direction perpendicular to the longitudinal direction of the conductor 33a in the order of description.

The antenna element 34 formed on the upper surface of the substrate 31c is composed of strip-shaped conductors 34a to 34f and a rectangular conductor 34g having a predetermined area, and is an element generally called an inverted-F antenna. Has a capacitive impedance at the feeding point, and the resonance frequency is set to, for example, 2.5 GHz.

The conductor 34a is disposed so as to substantially overlap the conductor 33a. One end of the conductor 34a is connected to the external terminal 32b serving as a feeding point via the conductor 34f and to the rectangular conductor 34g. Further, conductors 34b to 34e are connected to the other end of the conductor 34a so as to meander in a direction perpendicular to the longitudinal direction of the conductor 34a in the order described.

A conductor 35a having the same shape as the conductor 34g is provided on the upper surface of the substrate 31d so as to overlap the conductor 34g, and one side of the conductor 35a is connected to the grounding external terminal 32a via the conductor 35b. Have been.

As shown in FIGS. 7 and 8, the above-described dielectric antenna 30 is configured by connecting an antenna element 33 showing an inductive impedance X1 and an antenna element 34 showing a capacitive impedance X2 in parallel at a feeding point alone. Therefore, the feed point impedance X0 as shown in FIG. 9 is shown. The feed point impedance at the external terminal 32b is generally set to 50Ω which is set to the high frequency input / output impedance of the high frequency transmission / reception circuit. Therefore, as shown in FIG.
The return loss of 0 is caused by the individual antenna elements 33 and 34.
, And the frequency bandwidth showing a lower return loss is widened as compared with the case where the individual antenna elements 33 and 34 are used alone, and the antenna can be used in a wide band. In FIG. 10, the vertical axis represents the reflection loss (return loss), and one graduation represents 10 dB.
The horizontal axis represents frequency, and one division is 200 MHz.
Is represented.

Further, since the main body is formed by laminating each of the substrates 31a to 31d, the main body can be formed in a small size, and the size of an electronic device using the dielectric antenna 30 can be reduced.

Next, a fourth embodiment of the present invention will be described.

FIG. 11 is an exploded perspective view showing a dielectric antenna according to the fourth embodiment. In the figure, reference numeral 40 denotes a dielectric antenna, which is an insulating flat substrate (hereinafter simply referred to as a substrate) 41a, 41 made of a dielectric ceramic material.
b and 41c are laminated, an external terminal 42a is provided on one of two adjacent sides of the main body, an external terminal 42b is provided from one side to the other side, and an external terminal 42b is provided on the other side. A terminal 42c is provided.

A conductor forming the antenna elements 43 and 44 is provided on the upper surface of each of the other substrates 41b and 41c except the uppermost substrate 41a. Further, although not shown, a plurality of dummy electrodes are formed on the back surface of the lowermost substrate 41c so that the dummy electrodes can be stably fixed by soldering when mounted on the parent circuit board.

The antenna element 43 formed on the upper surface of the substrate 41b is composed of strip-shaped conductors 43a to 43i, and is an element generally called an inverted-F type antenna. For example, the resonance frequency is set to 2.4 GHz. The feed point impedance is set to, for example, about 100Ω. The conductor 43a is connected to an external terminal 42b serving as a power supply point.

The conductor 43b is arranged parallel to the side of the main body where the external terminal 42c is formed, and one end of the conductor 43b is connected to the conductor 43a. Conductors 43c to 43g are connected to the other end of the conductor 43b so as to extend in a meandering manner in the longitudinal direction of the conductor 43b in the order described.

The conductor 43h is arranged in parallel with the side surface of the main body on which the external terminal 42a is formed. One end of the conductor 43h is connected to the conductor 43a, and the other end is connected via a conductor 43i to the grounding external terminal 42a. It is connected to the.

The antenna element 44 formed on the upper surface of the substrate 41c is composed of strip-shaped conductors 44a to 44i, and is an element generally called an inverted-F type antenna, for example, having a resonance frequency set to 2.4 GHz. The feed point impedance is set to, for example, about 100Ω. The conductor 44a is arranged so as to overlap the conductor 43a and is connected to an external terminal 42b serving as a power supply point.

The conductor 44b is disposed parallel to the side surface of the main body where the external terminal 42a is formed, and one end thereof is connected to the conductor 44a. Conductors 44c to 44g are connected to the other end of the conductor 44b so as to meander in the longitudinal direction of the conductor 44b in the order described.

The conductor 44h is arranged parallel to the side surface of the main body where the external terminal 42c is formed. One end of the conductor 44h is connected to the conductor 44a, and the other end is connected to the external terminal 42c for grounding via the conductor 44i. It is connected to the.

In the above-described dielectric antenna 40, the radiation pattern of the radio wave of the antenna element 43 has directivity in a direction perpendicular to the length direction of the conductor 43b as shown in FIG. The antenna element 44 has substantially the same shape as the antenna element 43, but differs in the arrangement of the conductors 44a to 44i constituting the antenna element 44. That is, the antenna element 44 is disposed at a position rotated by 90 degrees with respect to the antenna element 43. Therefore, as shown in FIG. 13, the direction of the directivity indicated by the radiation pattern 51 of the radio wave of the antenna element 43 differs from the direction of the directivity indicated by the radiation pattern 52 of the radio wave of the antenna element 44 by 90 degrees. Therefore, the gain can be obtained with the other antenna element 44 in the direction where the gain cannot be obtained with the one antenna element 43.

Further, the two antenna elements 43 and 4
4 is set to, for example, about 100Ω, the feed point impedance at the external terminal 42b is generally 50Ω which is set to the high frequency input / output impedance of the high frequency transmission / reception circuit. Therefore, the reflection loss of the dielectric antenna 40 is obtained by combining the reflection losses of the individual antenna elements 43 and 44, and the frequency showing a lower reflection loss as compared with the case where the individual antenna elements 43 and 434 are used alone. The bandwidth is widened, and it can be used in a wide band.

Further, since the main body is formed by laminating each of the substrates 41a to 41c, the main body can be formed in a small size, and the size of an electronic device using the dielectric antenna 40 can be reduced.

The embodiments described above are merely specific examples of the present invention, and the present invention is not limited to only these embodiments.

For example, it is needless to say that the impedance at the external terminal serving as the feeding point is not limited to 50Ω and is set equal to the input / output impedance of the high frequency circuit connecting the dielectric antenna of the present invention.

Further, four or more antenna elements may be provided and these feeding points may be connected to the same external terminal.

A feed antenna of each antenna element is connected to a different external terminal to constitute a dielectric antenna, and is connected to a feed point of each antenna element on a parent circuit board on which the feed antenna is mounted. External terminals may be connected to each other.

Further, a dielectric antenna including two or more antennas formed by connecting two or more antenna elements in parallel may be configured. In this case, the resonance frequency of each antenna may be set to a different frequency band, for example, a frequency in the 900 MHz band and one in the 1.8 GHz band.

In the above embodiment, the F-type antenna and the monopole antenna are used as the antenna elements, but other types of antennas may be used.

In the above embodiment, the main body is formed by laminating a plurality of substrates, but the main body is formed only on one surface of one substrate.
A dielectric antenna provided with one or more antenna elements may be formed, or a dielectric antenna provided with an antenna element on each of the front and back surfaces of one substrate may be formed.

[0067]

As described above, according to the dielectric antenna according to the first aspect of the present invention, one of the antenna elements within the same frequency band has a frequency at which the return loss is large, and the other has a high frequency. Are set so that the reflection loss of the antenna element is reduced. Therefore, by using these two or more antenna elements, the frequency range in which the reflection loss is small in the frequency band can be expanded.

According to the dielectric antenna of the present invention, in addition to the above effects, the feeding points of two or more antenna elements are connected to the same external terminal.
The two or more antennas can be used simultaneously via one external terminal.

According to the dielectric antenna according to the third aspect, in addition to the above effects, both the antenna element having the inductive impedance and the antenna element having the capacitive impedance at the feeding point alone are provided. Therefore, when the feeding points of these antenna elements are connected, the reflection loss at the feeding point can be reduced.

According to the dielectric antenna of the fourth aspect, in addition to the above effects, two or more antenna elements are provided so that the radio wave radiation directions are different, so that the antenna element to be used is selected. To radiate radio waves in a specific direction, or to radiate radio waves in a plurality of directions by using the two or more antenna elements simultaneously.

According to the dielectric antenna of the fifth aspect, in addition to the above-described effects, the direction in which transmission / reception of radio waves is difficult by one antenna element can be supplemented by another antenna element. It is possible to suppress the deterioration of the transmission / reception state of the radio wave due to the arrangement of the body antenna and the use state of the electronic device equipped with the dielectric antenna.

According to the dielectric antenna according to the sixth aspect, in addition to the above effects, transmission and reception of radio waves in two different frequency bands can be performed using one dielectric antenna. The bandwidth in which a low return loss can be obtained in the frequency band can be expanded.

According to the dielectric antenna of the present invention, in addition to the above effects, the feeding points of each antenna element can be connected in parallel to use each antenna element at the same time. A low reflection loss can be obtained without providing an impedance matching circuit or the like.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a dielectric antenna according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a dielectric antenna according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an equivalent circuit of the dielectric antenna according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating frequency / return loss characteristics of the dielectric antenna according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a dielectric antenna according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a dielectric antenna according to a third embodiment of the present invention.

FIG. 7 is a diagram showing an equivalent circuit of a dielectric antenna according to a third embodiment of the present invention.

FIG. 8 is a Smith chart showing feed point impedance characteristics of each antenna element of the dielectric antenna according to the third embodiment of the present invention.

FIG. 9 is a Smith chart showing a feed point impedance characteristic of the dielectric antenna according to the third embodiment of the present invention.

FIG. 10 is a diagram illustrating frequency / return loss characteristics of a dielectric antenna according to a third embodiment of the present invention.

FIG. 11 is an exploded perspective view showing a dielectric antenna according to a fourth embodiment of the present invention.

FIG. 12 is a diagram illustrating a radio wave radiation pattern of an antenna element according to a fourth embodiment of the present invention.

FIG. 13 is a diagram illustrating a radio wave radiation pattern of a dielectric antenna according to a fourth embodiment of the present invention.

[Explanation of symbols]

10, 20, 30, 40: dielectric antenna, 11: main body, 11a to 11c, 21a to 21d, 31a to 31
d, 41a-41c ... substrate, 12a-12c, 22a-
22c, 32a, 32b, 42a to 42c ... external terminals,
13, 14, 23, 24, 25, 33, 34, 43, 4
4. Antenna element, 13a to 13i, 14a to 1
4i, 23a to 23i, 24a to 24f, 25a to 25
i, 33a to 33i, 34a to 34g 35a, 35b,
43a to 43i, 44a to 44i: Conductors.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiro Yasuda 6-16-20 Ueno, Taito-ku, Tokyo Within Taiyo Electric Power Co., Inc. (72) Inventor Takashi Amano 6-16-20 Ueno, Taito-ku, Tokyo Taiyo F-term (for reference) in Denki Co., Ltd. 5J021 AA01 AA02 AA11 AB02 HA05 5J046 AA04 AB06 PA01 QA08

Claims (7)

[Claims] 1. A body comprising at least one dielectric layer having a conductor provided on a surface thereof, and a body provided on an outer surface of the body.
And two or more external terminals, comprising two or more antenna elements formed by the conductor, a feed point of each antenna element is connected to the external terminal, and each of the at least two antenna elements A dielectric antenna, wherein resonance frequencies are set to different frequencies within the same frequency band. 2. The dielectric antenna according to claim 1, wherein feed points of two or more antenna elements are connected to the same external terminal. 3. The dielectric antenna according to claim 1, further comprising both an antenna element having an inductive impedance at a feeding point by itself and an antenna element having a capacitive impedance at a feeding point by itself. . 4. The dielectric antenna according to claim 1, wherein the at least two antenna elements are arranged so as to emit radio waves in different directions. 5. The dielectric antenna according to claim 4, comprising two antenna elements arranged so that the radiation directions of radio waves are different by 90 degrees. 6. At least two antenna elements having different frequencies in a first frequency band set as respective resonance frequencies, and different frequencies in a second frequency band different from the first frequency band have respective resonance frequencies. 2. The dielectric antenna according to claim 1, further comprising at least two antenna elements set as frequencies. 7. The feed point impedance of a single antenna element whose frequency within the same frequency band is set to the resonance frequency is determined by setting the feed point impedance when the feed points of the antenna elements are connected to each other as a connection target. 2. The dielectric antenna according to claim 1, wherein the dielectric antenna is set to a value substantially equal to a high-frequency input / output impedance of the high-frequency circuit.