JP2002353734A - Antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna system with excellent manufacturability by realizing a circularly polarized wave characteristics with a comparatively simple configuration. SOLUTION: A plurality of dipole elements 2, 3 are arranged along a transmission line 1 at an interval of a logarithmic value. The dipole elements 2, 3 have a structure of inverted feeding with each other. The transmission line 1 comprises parallel two-wires, and the dipole elements 2, 3 are disposed while being turned by 90-degrees difference each clockwise or counterclockwise when viewing from a feeder side or a termination side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a log-periodic antenna having a plurality of dipoles arranged log-periodically along a transmission line as elements.
More particularly, the present invention relates to an antenna device capable of emitting circularly polarized light with a simple configuration.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, Claus (JDK).
Raus) 's “Antenna (second edition) (ANTE)
NNAS-Second Edition-), McGrawHill, 1988, 7th.
FIG. 14 is a perspective view schematically showing a configuration of a general LPDA described as a reference in FIGS. 15 to 13 on page 08.

In FIG. 12, reference numeral 31 denotes a transmission line composed of two parallel wires, and has a feeder 40 at the tip. Reference numeral 32 denotes a plurality of dipole elements which are arranged logarithmically along the transmission line 31, and are associated with the feeder 40 and the termination (not shown) of the transmission line 31.
A33. Generally, the dipole element 32 is called an element of the LPDA 33.

Next, a general LPDA3 shown in FIG.
Operation 3 will be described. For example, at a certain frequency f, a signal propagating through the transmission line 31 from the power supply unit 40 excites a dipole element 32 having a dipole length that resonates at the frequency f.

As a result, the excited dipole element 32 emits a linearly polarized radio wave. At this time,
The excited dipole element 32 extends not only over a single element but also over a plurality of adjacent elements.

During the excitation, adjacent dipole elements 32 are alternately supplied with opposite-phase power, so that the radiation direction of the radio wave is on the power supply unit 40 side of the transmission line 31. The signal that has not been completely radiated propagates to the terminal side of the transmission line 31 and is absorbed at the terminal.

In such an LPDA 33, the excited dipole element 32 differs depending on the frequency of the propagation signal. In other words, the element having a long dipole length is excited in a low frequency range, and the excitation moves to the element having a short dipole length sequentially as the frequency becomes high. Accordingly, it is possible to radiate a linearly polarized radio wave over a wide frequency band.

By the way, in order to use the LPDA 33 as shown in FIG.
Conventionally, it was necessary to use two LPDA33s. That is, it is necessary to separately prepare an LPDA in which the extension direction of the dipole element 32 is orthogonal to the LPDA 33 shown in FIG. 12, and combine them so as to maintain the orthogonal relationship with the LPDA 33.

FIG. 13 shows a two-element LPDA 34 and 35.
FIG. 1 is a perspective view schematically showing a state in which are combined, for example, with reference to a reflector antenna disclosed in Japanese Patent Application Laid-Open No. 58-60802.

In FIG. 13, reference numeral 34 denotes a first LPDA, which includes a transmission line 34a and a dipole element 34.
b. Reference numeral 35 denotes a second LPDA, which is similarly constituted by a transmission line 35a and a dipole element 35b.

The dipole elements 34b and 35b of both LPDAs 34 and 35 are orthogonal to each other. The transmission lines 34a and 35a are arranged so as to be in contact with each other.

Further, a first LPDA 34 and a second LPDA
By setting the excitation phase difference with the DA 35 to 90 degrees, a circularly polarized radio wave can be generated with the radiation direction toward the power supply unit 40.

However, the LPDA configuration having the circular polarization characteristic shown in FIG. 13 has a complicated structure because it uses two LPDAs 34 and 35 in combination, and particularly in a high frequency band higher than microwaves. When used, it becomes very difficult to manufacture.

Further, since the two LPDAs 34 and 35 are used, the power supply circuit must be composed of two circuits. Even if the power supply circuit is composed of one circuit, the distribution circuit and the 90-degree excitation A phase shifter or the like for realizing the phase difference is required.

[0015]

As described above, the conventional antenna device has a circular polarization characteristic (see FIG. 13).
In this case, since two LPDAs 34 and 35 of the same type are used and arranged so as to maintain the orthogonal relationship between the dipole elements 34b and 35b, there is a problem that the structure is complicated and the manufacturability is poor.

Further, since two LPDAs 34 and 35 are used, it is necessary to use two power supply circuits or to incorporate a distribution circuit, a phase shifter, and the like in the power supply circuit, resulting in an increase in cost. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an antenna device excellent in manufacturability by realizing a circularly polarized wave characteristic with a relatively simple configuration. Aim.

[0018]

An antenna device according to the present invention has a structure in which a plurality of dipole elements are logarithmically arranged along a transmission line, and the dipole elements are configured to feed power in mutually opposite phases. , The transmission line is composed of two parallel wires, and the dipole elements are arranged by being sequentially rotated 90 degrees clockwise or counterclockwise when viewed from the power supply side or the terminal side of the transmission line.

Further, the antenna device according to the present invention includes first and second dielectric substrates which are combined so as to be orthogonal to each other, and the two parallel lines of the transmission line are substantially at the center of the first dielectric substrate. The first group of dipole elements is divided and printed separately on both sides of the part,
The second group of dipole elements is printed on one surface of the first dielectric substrate and arranged so as to be alternately symmetrical with respect to the center of the first dielectric substrate. Printed on the other surface of the first dielectric substrate, and with respect to the center of the first dielectric substrate,
The third group of dipole elements are printed on one surface of the second dielectric substrate, and are arranged so as to be alternately symmetrical at the symmetrical position of the first group. The fourth group of dipole elements are arranged so as to be alternately symmetrical with respect to the center of the dielectric substrate, and the fourth group of dipole elements is printed on the other surface of the second dielectric substrate. The first and third groups of dipole elements are arranged on one surface of the first dielectric substrate so as to be alternately symmetrical with respect to the center of the substrate at the symmetrical positions of the third group. The second and fourth groups of dipole elements are electrically connected to the transmission line provided, and are electrically connected to the transmission line provided on the other surface of the first dielectric substrate. is there.

Further, the second aspect of the antenna device according to the present invention
The first dielectric substrate has a slit formed in the longitudinal direction of the central portion, and the first dielectric substrate is combined so that the central portion is inserted into the slit and is orthogonal to the second dielectric substrate. It was done.

Further, the two parallel lines of the transmission line of the antenna device according to the present invention have a width wider than the thickness of the second dielectric substrate and do not face each other in the thickness direction of the first dielectric substrate. Are arranged as follows.

Further, the two parallel lines of the transmission line of the antenna device according to the present invention have a width wider than the thickness of the second dielectric substrate and are opposed to each other in the thickness direction of the first dielectric substrate. The transmission line is partially arranged to have a counterbore portion, and the counterbore portion is formed at a non-connection portion of the transmission line overlapping a connection portion between the dipole element and the transmission line.

Further, the two parallel lines of the transmission line of the antenna device according to the present invention have a width substantially the same as the thickness of the second dielectric substrate, and are relatively large in the thickness direction of the first dielectric substrate. The transmission line has a convex portion, and the convex portion is formed so as to correspond to a connection portion between the transmission line and a dipole element provided on the second dielectric substrate. It was done.

Further, the transmission line of the antenna device according to the present invention partially has a phase control unit, and the phase control unit is formed between the dipole elements.

Further, the phase control section of the antenna device according to the present invention is formed by a constricted section in which the width of the transmission line is reduced.

The phase control section of the antenna device according to the present invention is formed by a meandering section.

Further, a first antenna device according to the present invention
The dipole element disposed on one of the second dielectric substrate and the second dielectric substrate has a bent portion shifted toward the power supply side or the terminal side of the transmission line.

Further, a first antenna device according to the present invention
The dipole element disposed on one of the second dielectric substrate and the second dielectric substrate has a plurality of bent portions and is configured in a meandering shape.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a perspective view schematically showing Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a transmission line composed of two parallel wires, and a feeder 4 is provided at the end. 1a
Is one of the lines constituting the transmission line 1, and 1b is the transmission line 1.
Is the other line.

On the transmission line 1, a first dipole element 2 whose length is logarithmically extended from the feeder 4 side
And the second dipole elements 3 are arranged logarithmically.

The first dipole element 2 includes one dipole side 2a and the other dipole side 2b. Similarly, the second dipole element 3 includes one dipole one side 3a and the other dipole one side 3b.

The first dipole element 2 and the second dipole element 3 are # 1, # 2, # 3,.
As shown by the circles, the transmission lines 1 are arranged sequentially and alternately from the power supply unit 4 side, and are arranged so as to be orthogonal to each other.

The transmission line 1 and the first and second dipole elements 2 and 3 provide an L having circular polarization characteristics.
A PDA is configured. Note that the transmission line 1 and each of the dipole elements 2 and 3 are formed of a conductor wire having an arbitrary radius.

Next, a specific excitation operation according to the first embodiment of the present invention shown in FIG. 1 will be described. here,
The connection relationship between the transmission line 1 and each of the dipole elements 2 and 3 has a certain rule as described below.

For example, the first dipole element 2
(# 1) and the next adjacent first dipole element 2 (# 3) are connected so as to be excited in mutually opposite phases. This is the same for the second dipole element 3.

That is, when viewed from the power supply unit 4 side, first, regarding # 1 (the first dipole element 2),
One side 2a of the dipole is connected to one line 1a of the transmission line 1, and the other side 2b of the dipole is connected to the other line 1b.

Further, with respect to # 2 (second dipole element 3) which is orthogonal to the first dipole element 2, one side 3a of one dipole is connected to the line 1
a, and the other side 3b of the dipole is connected to the line 1b.

Next, for # 3 (first dipole element 2), one side 2a of one dipole is connected to line 1b.
And the other side 2b of the dipole is connected to the line 1a. Thereby, the first dipole elements 2 of # 1 and # 3 are in a relationship of being excited in mutually opposite phases.

Similarly, for # 4 (second dipole element 3), one of the dipoles 3a is connected to line 1
b, and one side 3b of the other dipole is connected to the line 1a. As a result, the second dipole elements 3 of # 2 and # 4 are in a relationship of being excited in mutually opposite phases.

Further, # 5 (the first dipole element 2) is connected to the transmission line 1 in the same manner as # 1 (the first dipole element 2), and # 6 (the second dipole element 3) is connected. , # 2 (second dipole element 3) in the same manner as the transmission line 1.

That is, one of the four dipole elements
The connection relationship with the transmission line 1 is maintained so as to have a period. In other words, this corresponds to connecting the dipole elements to the transmission line 1 while sequentially rotating the dipole elements 90 degrees clockwise as viewed from the power supply unit 4 side of the transmission line 1.

As a result, the first dipole element 2
And the second dipole element 3, adjacent dipole elements are excited in opposite phases to each other, and the dipole elements are arranged logarithmically in each row.

Therefore, the signal of the frequency f transmitted from the power supply unit 4 excites the first dipole element 2 and the second dipole element 3 having the resonance length corresponding to the frequency f.

At this time, as described above, since the first dipole element 2 and the second dipole element 3 have an arrangement relationship orthogonal to each other, the phases of the respective radiation patterns are shifted from each other by 90 degrees. Further, since the dipole lengths of the adjacent dipole elements 2 and 3 to be excited are substantially equal, substantially equal radiation pattern amplitudes can be obtained.

Therefore, the combination of the two radiation patterns from the dipole elements 2 and 3 configured as shown in FIG. 1 has a circular polarization characteristic. In addition, since the radiation direction at this time is LPDA, the radiation direction is the direction of the power supply unit 4 as described above.

Thus, in one-element LPDA,
The extension direction of each dipole element 2, 3 is, for example, right (or left) by 90 degrees as viewed from the feeder 4 side
It has a circular polarization characteristic by being arranged so as to be rotated around and connected to the transmission line 1 so as to be excited in the opposite phase relationship with respect to the adjacent dipole element in the dipole element row facing in the same direction. Radio waves can be emitted in the direction of the power supply unit 4.

Therefore, as compared with the conventional example (see FIG. 13), the structure is simple and easy, and the manufacturability can be improved. Further, the dipole length and the dipole element interval can use the conventional LPDA design values as they are, and the design simplicity can be realized.

Further, since it can be constituted by one element of LPDA, it is necessary to provide a distribution circuit, a phase shifter for realizing a 90-degree phase difference, and the like in a power supply circuit disposed behind the power supply unit 4. Therefore, the antenna device can be easily configured.

Embodiment 2 In the first embodiment, each of the dipole elements 2 and 3 is formed of a conductor wire in a free space, but may be printed on a dielectric substrate.

Hereinafter, a second embodiment of the present invention in which each dipole element is formed by printing on a dielectric substrate will be described. FIG. 2 is a perspective view schematically showing a configuration of the second embodiment of the present invention.

In FIG. 2, reference numeral 11 denotes a first dielectric substrate;
Reference numeral 12 denotes a second dielectric substrate, and the dielectric substrates 11 and 12 are arranged so as to be orthogonal to each other. 13
Is a transmission line composed of two parallel wires, and a feeder 1
7.

The transmission line 13 is formed by dividing both surfaces of the first dielectric substrate 11 by printing.
The lines are separated by the thickness of the first dielectric substrate 11.

In FIG. 2, the transmission line 13 printed on the upper surface of the first dielectric substrate 11 and the dipole element 14 connected thereto are indicated by relatively dark hatching.

On the other hand, the transmission line 13 printed on the lower surface side (the rear surface side in FIG. 2) of the first dielectric substrate 11 and the dipole element 14 connected thereto are relatively thin hatched. It is shown.

Reference numeral 14 denotes a dipole element, which is formed on both surfaces of each of the dielectric substrates 11 and 12 by printing. 15 is a transmission line 1 on the same plane as each other
3 and a dipole element 14, and are electrically connected by, for example, soldering.

Reference numeral 16 denotes a certain transmission line 13 on the opposing surfaces.
And the dipole element 14 and are electrically connected by, for example, soldering through through holes.

FIG. 3 is a plan view showing a state where the first dielectric substrate 11 and the second dielectric substrate 12 in FIG. 2 are separately disassembled. FIGS. 4A and 4B are cross-sectional views of the connection portions 15 and 16 in FIG.

3 and 4, reference numeral 18 denotes a through hole provided in the first dielectric substrate 11, and reference numeral 19 denotes a slit provided in the center of the second dielectric substrate 12 in the longitudinal direction.

The slit 19 is used to combine the respective dielectric substrates 11 and 12, and the central portion of the first dielectric substrate 11 is inserted. Next, the assembly structure of the printed antenna device according to the second embodiment of the present invention shown in FIGS. 2 to 4 will be described.

First, the first and second dielectric substrates 11,
12 is a slit 1 provided on the second dielectric substrate 12
9 are combined by inserting the first dielectric substrate 11. At this time, the substrates 11 and 12 are arranged orthogonal to each other.

The two transmission lines 13 divided on both sides of the first dielectric substrate 11 are positioned relative to each other in the thickness direction of the first dielectric substrate 11 in order to prevent interference with the dipole element 14. It is arranged not to face.

Transmission Line 13 and Dipole Element 13
4 (see FIG. 4A), the transmission line 13 formed on the first dielectric substrate 11 and the dipole element formed on the second dielectric substrate 12 In order to connect the two, the two are electrically connected with solder or the like.

On the other hand, at a connection point 16 where the transmission line 13 and the dipole element 13 do not directly contact each other (see FIG. 4B), the transmission line 13 and the second dielectric substrate 12
In order to connect with the dipole element 14 configured above, the connection electrode (through hole 18) must be penetrated in the thickness direction of the first dielectric substrate 11.

Therefore, a through-hole 18 is provided in the first dielectric substrate 11, and the transmission line 13 and the dipole element 14 are electrically connected via the through-hole 18 by soldering or the like.

The operation of the antenna device having circular polarization characteristics according to the second embodiment of the present invention shown in FIGS. 2 to 4 is the same as that described in the first embodiment, and will not be described here.

In this case, since the antenna device is constituted by the two dielectric substrates 11 and 12, there is an effect that the easiness of manufacture is increased particularly when it is assumed that the antenna device is used in a high frequency band.

Further, the LPDA structure is formed on each dielectric substrate 11,
12, the dipole length and the substantial length of the transmission line 13 are shorter than in the case of the spatial arrangement due to the wavelength shortening effect, even if the electrical length is the same as that of the spatial arrangement. Therefore, the antenna device can be downsized.

Embodiment 3 In the second embodiment, the two transmission lines 13 are arranged so as not to be opposed to each other in the thickness direction of the first dielectric substrate 11. If provided, the transmission lines may be arranged so as to face each other in the thickness direction of the dielectric substrate.

Hereinafter, a third embodiment of the present invention in which the transmission lines are arranged so as to face each other in the thickness direction of the dielectric substrate will be described. FIG. 5 is a plan view showing a structure printed on a dielectric substrate according to Embodiment 3 of the present invention.
The same reference numerals are given and detailed descriptions are omitted.

In FIG. 5, reference numeral 21 denotes the first dielectric substrate 1
1 is a transmission line provided in the first dielectric substrate 11
Are arranged so as to face each other in the thickness direction.
In this case, the width of the transmission line 21 is set to be wider than the thickness of the second dielectric substrate 12 that is combined orthogonally, and the transmission line 21 is configured to be equal on both surfaces of the first dielectric substrate 11. Further, the transmission line 21 of two parallel lines is
Since they face each other, they completely overlap.

Reference numeral 22 denotes a counterbore (notch) provided in a part of the transmission line 21. The counterbore unit 22 includes the transmission line 2
The transmission line 21 and the dipole element 14 are formed so as not to interfere with each other at a connection portion between the transmission line 1 and the dipole element 14 via the through hole 18.

Next, a specific structure according to the third embodiment of the present invention shown in FIG. 5 will be described. The method of combining the dielectric substrates 11 and 12 and the connection portion 15 between the transmission line 21 and the dipole element 14 that do not pass through the through hole 18 are as described in the second embodiment, and are omitted here. I do.

The operation as an antenna device having circular polarization characteristics and the operation and effect of forming the antenna device on each of the dielectric substrates 11 and 12 are as described in the second embodiment. , Is omitted here.

In this case, since the transmission lines 21 formed on both surfaces of the first dielectric substrate 11 are opposed to each other in the thickness direction of the first dielectric substrate 11, the through holes 18
The dipole element 14
Will interfere.

Therefore, interference with the dipole element 14 is prevented by the counterbore portion 22 provided on the transmission line 21.

As shown in FIG. 5, the transmission characteristics of the transmission line 21 are improved by arranging the two parallel lines constituting the transmission line 21 to face each other in the thickness direction of the first dielectric substrate 11. be able to.

Embodiment 4 In the third embodiment, the case where the width of the transmission line 21 is set to be wider than the thickness of the second dielectric substrate 12 has been described, but the transmission line 21 corresponds to the connection portion through the through hole 18. , The width of the transmission line 21 may be set to be substantially the same as the thickness of the second dielectric substrate 12. In this case, it is not necessary to provide a large counterbore portion 22 as shown in FIG.

Hereinafter, the width of the transmission line is set to the second dielectric substrate 1
A fourth embodiment of the present invention, which is set to the same thickness as that of the second embodiment, will be described. FIG. 6 is a plan view showing a first dielectric substrate 11 according to the fourth embodiment of the present invention.
5) are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 6, since the second dielectric substrate 12 is the same as that described above, the illustration is omitted. Reference numeral 23 denotes a protrusion of the transmission line 21 provided at the position of the through hole 18, and is formed on the first dielectric substrate 11 so as to extend from the transmission line 21.

That is, as shown in the figure, the through hole 18 is located in the convex portion 23, and the electrical connection between the transmission line 21 and the dipole element 14 can be easily made via the convex portion 23. I have.

Next, a specific structure according to the fourth embodiment of the present invention will be described. The method of combining the two dielectric substrates and the connection portion 15 between the transmission line 21 and the dipole element 14 not via the through hole 18 are as described in the second and third embodiments.
Here, it is omitted.

In this case, the line width of the transmission line 21 is substantially the same as the thickness of the second dielectric substrate 12 combined orthogonally, and the transmission line 2
1 is provided, the dipole element 14 and the transmission line 21 can be connected without interference without providing the counterbore portion 22 (see FIG. 5) on the transmission line 21. it can.

The operation as an antenna device having circular polarization characteristics and the operation and effect of providing the antenna device on a dielectric substrate are as described in the second and third embodiments. Here, it is omitted.

As described above, by setting the width of the transmission line 21 to be substantially equal to the thickness of the second dielectric substrate 12, it is not necessary to provide the counterbore portion 22 on the transmission line 21. 3, the transmission characteristics of the transmission line 21 can be further improved.

Embodiment 5 In the fourth embodiment, the entire width of the transmission line 21 is substantially uniform except for the protrusion 23. However, a phase control unit may be added to a part of the transmission line 21. Hereinafter, a fifth embodiment of the present invention in which a phase control unit is provided in a part of the transmission line 21 will be described.

FIG. 7 shows a first embodiment according to the fifth embodiment of the present invention.
FIG. 7 is a plan view showing the dielectric substrate 11 of FIG.

In FIG. 7, reference numeral 24 denotes a phase control section provided in the middle of the transmission line 21, and is provided between the dipole elements 14. In this case, the phase control unit 2
Reference numeral 4 denotes a constricted portion in which the width of the transmission line 21 is partially reduced.

As shown in FIG. 7, by providing the phase control unit 24 on the transmission line 21, the propagation characteristic of a signal transmitted through the transmission line 21 can be changed according to the line width (length) of the phase control unit 24. Can be adjusted.

Generally, in order to obtain a circularly polarized wave having a good axial ratio, it is necessary that the phases of two orthogonal linearly polarized waves are shifted by 90 degrees from each other. The adjustment is made.

Therefore, the excitation phase of the dipole element 14 can be adjusted by the length of the phase control section 24, and a desired circular polarization characteristic can be obtained.

Embodiment 6 FIG. In the fifth embodiment, the phase control unit 24 is formed by a partially constricted portion of the transmission line 21, but a function equivalent to that of the phase control unit 24 may be realized by a meandering unit.

Hereinafter, a sixth embodiment of the present invention in which a meandering portion is provided in a part of the transmission line 21 will be described. FIG. 8 is a plan view showing a first dielectric substrate 11 according to a sixth embodiment of the present invention. Components similar to those described above (FIGS. 2 to 7) are denoted by the same reference numerals, and are not described in detail. I do.

In FIG. 8, reference numeral 25 denotes a meandering part provided in the middle of the transmission line 21, and each dipole element 1
4 are provided.

As shown in FIG. 8, by providing the meandering portion 25 partially in the transmission line 21, the phase of the signal propagating in the transmission line 21 is changed according to the length (the meandering amount) of the meandering portion 25. Can be adjusted.

Therefore, the excitation phase of the dipole element 14 can be adjusted by the meandering portion 25, and desired circular polarization characteristics can be realized.

Embodiment 7 FIG. Embodiment 2 above
6, all the dipole elements 14 are formed linearly, but a bent portion may be provided on the dipole element on one of the dielectric substrates.

Hereinafter, a seventh embodiment of the present invention in which a bent portion is provided in a part of the dipole element will be described. Here, a case where the dipole element 14 provided on the second dielectric substrate 12 is bent near the center thereof will be described.

FIG. 9 is a plan view showing each of the dielectric substrates 11 and 12 according to the seventh embodiment of the present invention.
The same components as those in FIG. 8) are denoted by the same reference numerals, and the detailed description is omitted.

In FIG. 9, reference numeral 26 denotes the second dielectric substrate 1.
2 is a dipole element provided on the upper portion 2 and bent at a bent portion near the center. Thereby, the dipole element 26 appears as if the arrangement position was shifted to the end side of the transmission line 21.

As described above, generally, in order to have a circularly polarized wave having a good axial ratio, the phases of two orthogonal linearly polarized waves must be shifted by 90 degrees.

However, usually, the first dielectric substrate 1
1 and a dipole element 2 provided on the second dielectric substrate 12.
6 is different in length and arrangement position.

Therefore, when attention is paid to the operation at a certain frequency, it is conceivable that a phase difference of 90 degrees cannot be completely obtained due to the difference in the position where the orthogonal polarization is radiated.

Therefore, the vicinity of the center of the dipole element 26 is bent, for example, like a dipole element 26 provided on the second dielectric 12, so that the position of the dipole element 26 is shifted toward the end of the transmission line 21. It seems to have done.

Thus, the phase of the radiation wave from the dipole element 26 can be shifted, and the phase of the radiation wave from the dipole element 14 on the first dielectric substrate 11 is shifted exactly by 90 degrees. Can be adjusted.

Needless to say, the bent portion of the dipole element 26 is not limited to the case shifted only to the terminal side, but may be shifted to the feeder side of the transmission line 21.

Further, the dipole element on the second dielectric substrate 12 may be formed linearly, and conversely, a bent portion may be provided on the dipole element 14 on the first dielectric substrate 11.

Further, the arrangement position of the dipole element 26 may be shifted by a bent portion other than the portion shown in FIG. Also, the bent part is not limited to a right angle shape,
For example, as shown in FIG. 10, the same effect can be obtained even when bent into a slant shape.

In FIG. 10, reference numeral 27 denotes a dipole element provided on the second dielectric substrate 12, which is bent in a slant shape at the center. In the case of FIG. 10, in addition to the above-described effects, there is also an effect that the beam width is widened. At this time, the adjustment of the beam width can be performed by the slant inclination angle.

Embodiment 8 FIG. In the seventh embodiment, the bent portion is provided in a part of the dipole element. However, the entire dipole element may be configured in a meandering shape.

An eighth embodiment of the present invention in which a dipole element on one dielectric substrate is formed in a meandering shape will be described below.
Will be described. Here, a case where the dipole element provided on the second dielectric substrate 12 is configured in a meandering shape will be described.

FIG. 11 is a plan view showing a second dielectric substrate 12 according to the eighth embodiment of the present invention.
The same components as those in FIG. 10) are denoted by the same reference numerals, and the detailed description is omitted.

In FIG. 11, reference numeral 28 denotes a dipole element provided on the second dielectric substrate 12, which is bent in a meandering manner. Also in this case, the overall operation and operation and effect are the same as those described above, and thus detailed description is omitted here.

As shown in FIG. 11, the length of the dipole element 28 in the length direction can be reduced while the resonance frequency is fixed by using the dipole element 28 bent in a meandering shape. The specific meandering shape is not limited to that shown in FIG. 11, and may be, for example, a rounded meandering shape.

[0115]

As described above, according to the present invention, there is provided an antenna apparatus having a structure in which a plurality of dipole elements are arranged logarithmically along a transmission line and the dipole elements feed in mutually opposite phases. The transmission line is composed of two parallel wires, and the dipole element is arranged by sequentially rotating 90 degrees clockwise or counterclockwise when viewed from the power supply side or the terminal side of the transmission line, and has a relatively circular polarization characteristic. Since the antenna device is realized with a simple configuration, there is an effect that an antenna device excellent in manufacturability can be obtained.

Further, according to the present invention, there are provided the first and second dielectric substrates which are combined so as to be orthogonal to each other, and the two parallel lines of the transmission line are substantially at the center of the first dielectric substrate. Divided on both sides and printed separately, a first group of dipole elements is printed on one side of the first dielectric substrate and alternately with respect to the center of the first dielectric substrate Arranged to be symmetrical, the second group of dipole elements is:
A dipole that is printed on the other surface of the first dielectric substrate and that is alternately symmetrical at a symmetrical position of the first group with respect to the center of the first dielectric substrate; A third group of elements are printed on one surface of the second dielectric substrate and are arranged so as to be alternately symmetrical with respect to the center of the second dielectric substrate. The fourth group is printed on the other surface of the second dielectric substrate, and is alternately symmetrical with respect to the center of the second dielectric substrate at the symmetrical position of the third group. And the first and third groups of dipole elements are electrically connected to transmission lines provided on one surface of the first dielectric substrate, and the second and fourth groups of dipole elements are electrically connected to each other. Guru The antenna device is electrically connected to a transmission line provided on the other surface of the first dielectric substrate, and realizes circularly polarized wave characteristics with a relatively simple configuration. The effect is obtained.

Further, according to the present invention, the second dielectric substrate has a slit formed in the central portion in the longitudinal direction,
The first dielectric substrate has a central portion inserted into the slit and is combined so as to be orthogonal to the second dielectric substrate, and has achieved a circularly polarized wave characteristic with a relatively simple configuration. This has the effect of obtaining an antenna device having excellent performance.

Further, according to the present invention, the two parallel lines of the transmission line have a width wider than the thickness of the second dielectric substrate, and do not face each other in the thickness direction of the first dielectric substrate. , There is an effect that an antenna device in which interference between the transmission line and the dipole element is prevented can be obtained.

Further, according to the present invention, the two parallel lines of the transmission line have a width wider than the thickness of the second dielectric substrate and are opposed to each other in the thickness direction of the first dielectric substrate. The transmission line partially has a counterbore portion, and the counterbore portion is formed at a non-connection portion of the transmission line overlapping the connection portion between the dipole element and the transmission line. There is an effect that an antenna device in which interference with the element is prevented can be obtained.

Further, according to the present invention, the two parallel lines of the transmission line have substantially the same width as the thickness of the second dielectric substrate, and are opposed to each other in the thickness direction of the first dielectric substrate. The transmission line has a convex portion partially, and the convex portion is formed so as to correspond to a connection portion between the transmission line and a dipole element provided on the second dielectric substrate. Therefore, there is an effect that the interference between the transmission line and the dipole element can be prevented with a simple configuration, and an antenna device that facilitates electrical connection can be obtained.

According to the present invention, the transmission line partially has the phase control unit, and the phase control unit is formed between each of the dipole elements, so that the excitation phase of the dipole element is adjusted. Therefore, there is an effect that an antenna device achieving desired circular polarization characteristics can be obtained.

Further, according to the present invention, the phase control unit comprises:
Since the transmission line is formed by the constricted portion having a reduced width, the excitation phase of the dipole element can be easily adjusted, and an antenna device having a desired circular polarization characteristic can be obtained.

Further, according to the present invention, the phase control section comprises:
Since it is formed by the meandering portion, it is possible to easily adjust the excitation phase of the dipole element, and it is possible to obtain an antenna device having a desired circular polarization characteristic.

According to the present invention, the first and second
Since the dipole element disposed on one of the dielectric substrates has a bent portion shifted toward the feed side or the end side of the transmission line, the phase of the radiation wave from the dipole element can be shifted, and the There is an effect that an antenna device that can be adjusted so as to be staggered is obtained.

According to the present invention, the first and second
The dipole element arranged on one side of the dielectric substrate has a plurality of bent parts and is configured in a meandering shape, so the phase of the radiation wave from the dipole element can be shifted and adjusted so that it is shifted exactly 90 degrees There is an effect that a possible antenna device is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an antenna device in free space according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a configuration of a printed antenna device according to a second embodiment of the present invention.

FIG. 3 is an exploded plan view showing a printed pattern configuration on first and second dielectric substrates according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a structure of each connection portion in a state where first and second dielectric substrates are combined according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a transmission line having a counterbore portion on a first dielectric substrate according to a third embodiment of the present invention.

FIG. 6 is a plan view showing a transmission line having a projection on a first dielectric substrate according to a fourth embodiment of the present invention.

FIG. 7 is a plan view showing a transmission line having a phase control unit on a first dielectric substrate according to a fifth embodiment of the present invention.

FIG. 8 is a plan view showing a transmission line having a meandering portion on a first dielectric substrate according to a sixth embodiment of the present invention.

FIG. 9 is a plan view showing a dipole element having a bent portion on a second dielectric substrate according to a seventh embodiment of the present invention.

FIG. 10 is a plan view showing a slant type dipole element on a second dielectric substrate according to a seventh embodiment of the present invention.

FIG. 11 is a plan view showing a meandering dipole element on a second dielectric substrate according to an eighth embodiment of the present invention.

FIG. 12 is a perspective view schematically showing a configuration of a conventional LPDA.

FIG. 13 is a perspective view schematically showing a conventional LPDA having circular polarization characteristics (in a combined state).

[Explanation of symbols]

1, 13, 21 Transmission line, 1a One line of transmission line, 1b The other line of transmission line, 2nd dipole element, 2a One side of one dipole of 1st dipole element, 2b 1st dipole element The other dipole one side, the second dipole element, 3a one of the dipole elements of the second dipole element, 3b the other dipole one side of the second dipole element, 4, 17 a power supply section, 11 a first dielectric substrate, 12 second dielectric substrate, 14 dipole elements, 15, 16 connection points, 18 through holes, 19 slits, 22 counterbore parts, 23 projections of transmission lines, 24 phase control parts, 25 meandering parts, 26 bent parts Dipole element, 27 Slant type dipole element, 28 Paul element.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuro Sasaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Yoshihiko Konishi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 F term in Ryo Denki Co., Ltd. (reference) 5J021 AA07 AB03 GA08 HA05 HA10 JA06

Claims (11)

[Claims] 1. An antenna device having a structure in which a plurality of dipole elements are arranged logarithmically along a transmission line and the dipole elements are configured to feed power in mutually opposite phases. The antenna device, wherein the dipole element is arranged by being sequentially rotated clockwise or counterclockwise by 90 degrees when viewed from a feed side or a terminal side of the transmission line. 2. A semiconductor device comprising: a first dielectric substrate and a second dielectric substrate which are combined so as to be orthogonal to each other, wherein two parallel lines of the transmission line are divided into two surfaces substantially at a central portion of the first dielectric substrate. The first group of dipole elements are printed on one surface of the first dielectric substrate and are alternately symmetric about a center of the first dielectric substrate. A second group of dipole elements is printed on the other surface of the first dielectric substrate, and with respect to a center of the first dielectric substrate, First
And a third group of the dipole elements are printed on one surface of the second dielectric substrate, and the third group of the dipole elements is printed on one surface of the second dielectric substrate. And a fourth group of dipole elements are printed on the other surface of the second dielectric substrate, and the fourth group of dipole elements is printed on the other surface of the second dielectric substrate. With respect to the center of the second dielectric substrate,
The first and third groups of the dipole elements are arranged on a transmission line provided on one surface of the first dielectric substrate. The second and fourth groups of the dipole elements are electrically connected, and are electrically connected to a transmission line provided on the other surface of the first dielectric substrate. Item 1
An antenna device according to claim 1. 3. The second dielectric substrate has a slit formed in a central portion in a longitudinal direction. The first dielectric substrate has a central portion inserted into the slit, and the second dielectric substrate has a slit formed therein. 3. The antenna device according to claim 2, wherein the antenna device is combined so as to be orthogonal to the dielectric substrate. 4. The two parallel lines of the transmission line have a width wider than the thickness of the second dielectric substrate and are arranged so as not to face each other in the thickness direction of the first dielectric substrate. Claim 2 or Claim 3
An antenna device according to claim 1. 5. The parallel line of the transmission line has a width wider than the thickness of the second dielectric substrate, and is arranged so as to face each other in the thickness direction of the first dielectric substrate. Wherein the transmission line partially has a counterbore portion, and the counterbore portion is formed at a non-connection portion of the transmission line overlapping a connection portion between the dipole element and the transmission line. The antenna device according to claim 2 or 3, wherein 6. The two parallel lines of the transmission line have substantially the same width as the thickness of the second dielectric substrate, and are opposed to each other in the thickness direction of the first dielectric substrate. The transmission line is arranged, and the transmission line partially has a convex portion, and the convex portion is formed so as to correspond to a connection portion between the transmission line and a dipole element provided on the second dielectric substrate. The antenna device according to claim 2, wherein the antenna device is provided. 7. The transmission line according to claim 2, wherein the transmission line partially has a phase control unit, and the phase control unit is formed between each of the dipole elements.
The antenna device according to any one of the above. 8. The antenna device according to claim 7, wherein the phase control unit is formed by a constricted portion having a reduced width of the transmission line. 9. The antenna device according to claim 7, wherein the phase control section is formed by a meandering section. 10. The dipole element disposed on one of the first and second dielectric substrates has a bent portion shifted toward a power supply side or a terminal side of the transmission line. The antenna device according to any one of claims 1 to 6. 11. The dipole element arranged on one of the first and second dielectric substrates has a plurality of the bent portions and is configured in a meandering shape. Antenna device.