JP5854943B2 - Antenna device and array antenna device - Google Patents

Description

  The present invention relates to an antenna device such as a dual-frequency antenna device that can operate in two frequency bands that are relatively close to each other, and an array antenna device.

  Conventionally, as an antenna device that operates in two frequency bands, a ring patch antenna with a non-excitation element partially short-circuited in an inner circle, and an antenna including another ring patch antenna on the same plane as the excitation element of the patch antenna An apparatus is disclosed (see Patent Document 1).

FIG. 9 shows a schematic diagram of an antenna device 90 according to the prior art.
9A is a front view of the composite antenna 90 as viewed from above, and FIG. 9B is a cross-sectional view taken along one-dot chain line AA ′ in FIG. 9A.
In FIG. 9, an antenna device 90 includes a dielectric substrate 94a having a ground conductor GND provided on the back surface, a circular patch antenna formed of a disk-shaped conductor 92 on the surface of the dielectric substrate 94a, and a circular patch antenna. On the outer peripheral side of the conductor portion 91 formed so as to enclose the circular patch antenna, the disk-shaped dielectric substrate 94b provided at a position facing the surface of the dielectric substrate 94a, and the surface of the dielectric substrate 94b An annular conductor 93 having a shape similar to that of the conductor 91 provided in a non-contact manner with the conductor 91, connection conductors 97a to 97d that partially short-circuit the conductor 91 and the ground conductor GND, and a conductor 91 The connecting conductors 97f to 97h that partially short-circuit the conductor portion 93, and a feed circuit that supplies appropriate high-frequency signals to the conductor portions 91 and 92 through the coaxial feed lines 99a and 99b, respectively. It is composed of a 8.
The conductor 92 and the ground conductor GND form an MSA (Micro Strip Antenna), and the conductors 91 and 93 and the connecting conductors 97a to 97h form a PSA (Partially Shorted Antenna).

JP 2012-54917 A

Since the conventional antenna device is configured as described above, there are the following problems.
As one method for broadening the band of the MSA formed by the conductor portion 92 and the ground conductor GND, there is a method of adjusting the height of the conductor portion 92 relative to the ground conductor GND so that the band is widened. .
However, since the conductor portions 91 and 92 are provided on the same plane and the conductor portion 93 is provided at a predetermined interval from the plane, the height of the conductor portion 92 with respect to the ground conductor GND is arranged at a height that widens the band. When adjusted so that the height of the entire antenna device from the ground conductor GND to the conductor portion 93 increases.

  An object of the present invention is to provide an antenna device that enables a broadband antenna formed by a second conductor portion and a ground conductor without increasing the overall height of the antenna device.

  The antenna device of the present invention includes a ground conductor, a first conductor portion provided to be separated from the ground conductor, a second conductor portion provided on a side different from the ground conductor with respect to the first conductor portion, A third conductor portion which is provided on a different side from the ground conductor with respect to the second conductor portion and serves as a non-excitation element for the first conductor portion; a part of an inner peripheral side peripheral portion of the first conductor portion; A first connecting conductor for connecting the ground conductor, a second connecting conductor for connecting a part of the inner peripheral edge of the first conductor part and the third conductor part, and a first conductor part. And a power feeding section for supplying the second high-frequency signal to the second conductor section.

According to the present invention, since the second conductor portion is provided between the first conductor portion and the third conductor portion, the height of the first conductor portion with respect to the ground conductor and the third conductor portion with respect to the ground conductor The height of the second conductor portion with respect to the ground conductor can be adjusted without affecting the height of the ground conductor.
Therefore, there is an effect that the antenna formed by the second conductor portion and the ground conductor can be widened without increasing the overall height of the antenna device.

It is the schematic which shows the antenna apparatus by Embodiment 1 of this invention. It is the schematic which shows the antenna apparatus which provided a pair of notch in the conductor part by Embodiment 1 of this invention. It is the schematic which shows the antenna device which provided a pair of notch in the conventional conductor part. It is a characteristic view showing a simulation result of a ratio band% in which the axial ratio characteristic in the front direction is 3 dB or less when the ratio of the height from the ground conductor to the conductor portion with respect to the wavelength is t. It is the schematic which shows the antenna apparatus by Embodiment 2 of this invention. It is the schematic which shows the antenna apparatus by Embodiment 3 of this invention. It is the schematic which shows the antenna apparatus by Embodiment 4 of this invention. It is the schematic which shows the antenna apparatus by Embodiment 5 of this invention. It is the schematic which shows the conventional antenna apparatus.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram of an antenna device according to Embodiment 1 of the present invention.
1A is a front view of a schematic view of the antenna device 10 as viewed from above, and FIG. 1B is a cross-sectional view taken along one-dot chain line AA ′ in FIG.
In FIG. 1, the antenna device 10 is provided with a conductor portion (first conductor portion) 11 above the ground conductor GND and a conductor portion (second conductor portion) 12 above the conductor portion 11. A conductor part (third conductor part) 13 is provided above the part 12.
The ground conductor GND has a disk shape, and the conductor portions 11 to 13 have an annular shape concentric with the ground conductor GND.
The conductor portion 12 is provided so as to be included in the conductor portion 11 when viewed from the stacking direction.

The connection conductors (first connection conductor, third connection conductor) 17a to 17d partially short-circuit the inner peripheral edge of the conductor portion 11 and the ground conductor GND.
The connection conductors (second connection conductor, fourth connection conductor) 17e to 17h partially short-circuit the inner peripheral side peripheral edge portion of the conductor portion 11 and the conductor portion 13.
Further, the connecting conductors 17 a to 17 d and the connecting conductors 17 e to 17 h are arranged at symmetrical positions with respect to the center of the conductor portion 12.
The feeding circuit (feeding unit) 18 supplies an appropriate high-frequency signal to the conductor unit 11 through the coaxial feeding line 19a and to the conductor unit 12 through the coaxial feeding line 19b.
The MSA is formed by the conductor portion 12 and the ground conductor GND, and the PSA is formed by the conductor portions 11 and 13 and the connecting conductors 17a to 17h.
The conductor portion 13 is a non-exciting element of the conductor portion 11, thereby making the PSA wider.

The effect of the antenna device 10 shown in FIG. 1 will be described in comparison with the prior art.
For evaluation, FIG. 2 shows an antenna device 20 in which a pair of notches 12a and 12b for exciting circularly polarized waves are provided in the conductor portion 12 in the antenna device 10 shown in FIG.
For comparison, FIG. 3 shows an antenna device 30 in a conventional antenna device 90 in which the dielectric constants of the dielectric substrates 94a and 94b are set to 1, and the conductor portion 92 is provided with a pair of cutouts 32a and 32b.

FIG. 4 shows a simulation result 41 of a ratio band% in which the axial ratio characteristic in the front direction is 3 dB or less when the height t of the conductor portion 12 with respect to the ground conductor GND is represented by the ratio of the wavelength λ at the operating frequency.
As can be seen from the simulation result 41 in FIG. 4, the ratio band increases from 0.7% to 1.7% as the height t changes from 0.03λ to 0.05λ.
In the conventional antenna device 30 shown in FIG. 3, t is 0.03λ, and the specific band is 0.7%, which is less than 1%.
Here, the conventional antenna device 30 shown in FIG. 3 has a structure in which the conductor portions 91 and 92 are provided on the same plane and the conductor portion 93 is provided at a predetermined interval from the plane. When the height t of the conductor 92 with respect to the ground conductor GND is increased, the overall height of the antenna device from the ground conductor GND to the conductor 93 increases.

On the other hand, in the antenna device 20 shown in FIG. 2, since the conductor portion 12 is provided between the conductor portion 11 and the conductor portion 13, the height of the conductor portion 11 with respect to the ground conductor GND and the conductor with respect to the ground conductor GND. The height of the conductor portion 12 with respect to the ground conductor GND can be adjusted without affecting the height of the portion 13.
Therefore, the height t of the conductor portion 12 with respect to the ground conductor GND is adjusted to, for example, 0.05λ without increasing the height of the entire antenna device from the ground conductor GND to the conductor portion 13, so that the ratio band is 1 .7%, and the broadband of the MSA formed by the conductor portion 12 and the ground conductor GND becomes possible.

  As described above, according to the first embodiment, since the conductor portion 12 is provided between the conductor portion 11 and the conductor portion 13, the overall height of the antenna device from the ground conductor GND to the conductor portion 13 is increased. Without this, the MSA formed by the conductor portion 12 and the ground conductor GND can be widened.

  Moreover, since the conductor part 12 was made into cyclic | annular shape, while being able to reduce in size, the influence between MSA and PSA can be reduced.

Further, in the antenna device 20 of FIG. 2, since the pair of notches 12a and 12b are provided in the conductor portion 12, the MSA can excite circularly polarized waves.
In addition to the conductor portion 12, a pair of notches may be provided in the conductor portion 11, and in this case, circularly polarized waves can be excited in the MSA and the PSA.

  Furthermore, since the connecting conductors 17a to 17d and the connecting conductors 17e to 17h are arranged at symmetrical positions with respect to the center of the conductor portion 12, the axial ratio characteristics of the PSA can be improved.

  The configuration of the antenna device 10 shown in FIG. 1 is not a configuration in which each conductor portion is supported by a dielectric substrate like the antenna device 90 shown in the prior art of FIG. 9, but each conductor portion is an insulator. It may be supported by a spacer formed by

Embodiment 2. FIG.
FIG. 5 is a schematic diagram of an antenna device according to Embodiment 2 of the present invention.
In FIG. 5, the antenna device 50 supplies a high-frequency signal through coaxial feed lines 19 b and 19 c to a predetermined position where the circularly polarized wave of the conductor portion 12 can be excited from the feed circuit 18.
Other configurations are the same as those in FIG.
In FIG. 5B, the coaxial feed line 19c is not originally shown, but is shown for easy understanding.

As described above, according to the second embodiment, since the conductor portion 12 is provided with two feeding points at predetermined positions where the circularly polarized wave can be excited, the MSA can excite the circularly polarized wave. it can.
In addition to the conductor part 12, two feeding points may be provided at predetermined positions where the circularly polarized wave of the conductor part 11 can be excited. In this case, the circularly polarized wave can be excited by MSA and PSA. .

Embodiment 3 FIG.
FIG. 6 is a schematic diagram of an antenna device according to Embodiment 3 of the present invention.
In FIG. 6, the antenna device 60 includes a conductor part (fourth conductor part) 62 having substantially the same shape disposed above the conductor part 12, and appropriately adjusts the size of the conductor part 12. An excitation element is used.
Other configurations are the same as those in FIG.

  As described above, according to the third embodiment, since the conductor part 62 serving as the non-excitation element of the conductor part 12 is provided, the MSA can obtain a wider band characteristic.

Embodiment 4 FIG.
FIG. 7 is a schematic diagram of an antenna apparatus according to Embodiment 4 of the present invention.
In FIG. 7, the antenna device 70 has a configuration in which the connecting conductors 17a to 17h are removed from the antenna device 10 shown in FIG.

  As described above, according to the fourth embodiment, since the connecting conductors 17a to 17h are removed, the MSA can be widened without increasing the overall height of the antenna device in this case, Furthermore, the configuration can be simplified.

Embodiment 5 FIG.
FIG. 8 is a schematic diagram of an antenna device according to Embodiment 5 of the present invention.
In FIG. 8, the antenna device 80 is provided so that the conductor portion (second conductor portion) 82 overlaps the conductor portion 11 and the conductor portion 13 in the antenna device 70 shown in FIG. Is.

  As described above, according to the fifth embodiment, since the conductor portion 82 is provided so as to overlap the conductor portion 11 and the conductor portion 13 when viewed from the stacking direction, the two-frequency opening having a closer operating frequency. A shared antenna can be made designable.

Note that the antenna devices 10, 20, 50, 60, 70, and 80 described in the above embodiments may be two-dimensionally or three-dimensionally arrayed at an appropriate interval.
As a result, high gain can be expected and beam control can be performed.

  Moreover, although the said embodiment demonstrated the case where a conductor part was an annular shape, this invention is not limited to this, For example, you may make a disk shape and a rectangular shape.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  10, 20, 50, 60, 70, 80 Antenna device, 11 conductor part (first conductor part), 12, 82 conductor part (second conductor part), 12a, 12b notch, 13 conductor part (third Conductor portion), GND ground conductor, 17a to 17d connecting conductor (first connecting conductor, third connecting conductor), 17e to 17h connecting conductor (second connecting conductor, fourth connecting conductor), 18 power feeding circuit (Feeding part), 19a to 19c Coaxial feed line, 41 Simulation result, 62 Conductor part (fourth conductor part), 82 Conductor part (second conductor part).

Claims (12)

A ground conductor;
A first conductor portion provided separately from the ground conductor;
A second conductor portion provided on a different side from the ground conductor with respect to the first conductor portion;
A third conductor portion provided on a different side from the ground conductor with respect to the second conductor portion, and serving as a non-excitation element of the first conductor portion;
A first connecting conductor that connects a part of the inner peripheral edge of the first conductor and the ground conductor;
A second connecting conductor for connecting a part of the inner peripheral edge of the first conductor part and the third conductor part;
A power feeding section that supplies a first high-frequency signal to the first conductor section and supplies a second high-frequency signal to the second conductor section;
An antenna device comprising: A ground conductor;
A first conductor portion provided separately from the ground conductor;
A second conductor portion provided on a different side from the ground conductor with respect to the first conductor portion;
A third conductor portion provided on a different side from the ground conductor with respect to the second conductor portion, and serving as a non-excitation element of the first conductor portion;
A first connecting conductor that connects the first conductor portion and the ground conductor;
Apart from the first connecting conductor, a third connecting conductor for connecting the first conductor portion and the ground conductor;
A second connecting conductor connecting the first conductor portion and the third conductor portion;
Apart from the second connecting conductor, a fourth connecting conductor for connecting the first conductor part and the third conductor part;
A power feeding section that supplies a first high-frequency signal to the first conductor section and supplies a second high-frequency signal to the second conductor section;
An antenna device comprising: A ground conductor;
A first conductor portion provided separately from the ground conductor;
A second conductor portion provided on a different side from the ground conductor with respect to the first conductor portion;
A third conductor portion provided on a different side from the ground conductor with respect to the second conductor portion, and serving as a non-excitation element of the first conductor portion;
A power feeding section that supplies a first high-frequency signal to the first conductor section and supplies a second high-frequency signal to the second conductor section;
An antenna device comprising:   The said 2nd conductor part was provided so that it might be included in the said 1st conductor part seeing from the lamination direction, The any one of Claims 1-3 characterized by the above-mentioned. Antenna device.   The said 2nd conductor part was provided so that it might overlap with the said 1st conductor part and the said 3rd conductor part seeing from the lamination direction, Any one of the Claims 1-3 characterized by the above-mentioned. The antenna device according to claim 1.   The fourth conductor portion provided on a different side from the ground conductor with respect to the second conductor portion and serving as a non-excitation element for the second conductor portion. The antenna device according to any one of 5. The second conductor portion has a disk shape,
The antenna device according to claim 1, wherein the first conductor portion has an annular shape concentric with the second conductor portion. The second conductor portion has an annular shape,
The antenna device according to claim 1, wherein the first conductor portion has an annular shape concentric with the second conductor portion.   The antenna device according to claim 7 or 8, wherein the first conductor portion and the second conductor portion are provided with a pair of cutouts for exciting circularly polarized waves.   9. The antenna device according to claim 7, wherein each of the first conductor portion and the second conductor portion includes two feeding points at predetermined positions where circularly polarized waves can be excited. .   The antenna device according to claim 9 or 10, wherein the first connection conductor and the second connection conductor are arranged at symmetrical positions with respect to a center of the second conductor portion.   An antenna apparatus according to any one of claims 1 to 11, wherein the antenna apparatus is arranged in an array.

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