JPH1084221A - Polalization shared plane antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antenna which excels in directivity with no deterioration of its efficiency by setting an element array space of radiation elements at a specific multiple as much as a free space wavelength of a 1st use frequency in an exciting direction of a radiation element. SOLUTION: The element array space P1 of radiation elements 7 is set by a feeder line 8 at about 0.813 times as much as the free space wavelength of a 1st use frequency in the exciting direction of the elements 7 together with the number of elements 7 set at a multiple of 16 respectively. Then the output terminal of the line 8 is used as an input terminal of the 2nd frequency that is equivalent to about 1.14 times as much as the 1st use frequency together with the output terminal of a feeder line 4 used as an output terminal for the 1st use frequency respectively. In regard to the directivity that is defined by the line 4 within a plane that is orthogonal to the exciting direction of the radiation elements 3, the null points are formed in directions of ±4.4 deg., ±8.8 deg. and ±13.2 deg. to the direction where the maximum interference radio wave arrives from an adjacent communication satellite, i.e., to the main radiation direction. Thereby, the influence of the interference radio wave sent from the adjacent communication satellite can be reduced when the 1st use frequency is used for reception.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-polarized triplate type planar antenna used for satellite communication in a microwave band.

[0002]

2. Description of the Related Art In microwave band satellite communication, transmission and reception are separated by orthogonal polarizations, so that orthogonal polarization can be radiated by one antenna so that transmission and reception can be performed in order to support these applications. Suitable possible planar antennas have been developed. As such a planar antenna, the present inventors have
The radiating element 3 and the radiating element 7 are electromagnetically coupled, and a dual-polarized planar antenna in which the excitation direction of the radiating element 3 by the feed line 4 and the excitation direction of the radiating element 7 by the feed line 8 are orthogonal is proposed in 1992. Proceedings of the IEICE Spring Meeting B6
2 "Radiation characteristics of a dual-polarized triplate-fed planar antenna".

[0003] Further, regarding a dual-polarized planar antenna functioning at two different frequencies capable of coping with transmission / reception, the paper "Dual-frequency and Dual-polarization Low Sidel" is also disclosed.
obeMicrostrip Array Antenna for Satellite Communic
ations "(Proceeding of ISAP '92, PP1113-1116,).

[0004]

In such an antenna used for satellite communication, generally, in order to prevent interference with other satellite communication systems, adjacent communication satellites other than the communication satellite to be transmitted are subjected to interference radio waves. Since the allowable radiation power is specified, it is necessary to suppress the side lobe level in the directivity of the antenna to a specified level or less. Also, at the time of reception, radio waves from adjacent communication satellites become interference signals and the reception performance deteriorates. Therefore, the side lobe level in the directivity of the antenna must be kept low.

Here, in order to reduce the side lobe level of the antenna directivity, in the case of an element array antenna, it is necessary to make the power supply distribution and the phase distribution to each element a special distribution that is not uniform. However, there has been a problem that the efficiency of the method is reduced and a desired gain cannot be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dual-polarized planar antenna having excellent directivity without lowering the efficiency.

[0007]

According to the present invention, there is provided a dual-polarized triplate planar antenna according to the present invention, as shown in FIG.
1, a dielectric 10, a plurality of radiating elements 7 and a feeding board 9 on which a feeding line 8 is formed, a dielectric 6, and a plurality of slots provided so that each slot 12 is located directly above the radiating element 7. A ground conductor 1 having a slot 12, a dielectric 2, a feed substrate 5 on which a plurality of radiating elements 3 and a feed line 4 are formed, a dielectric 13, and each slot 14 are located directly above the radiating element 3. And a ground conductor 15 having a plurality of slots 14 are stacked in this order, the radiating element 3 and the radiating element 7 are electromagnetically coupled, and the excitation direction of the radiating element 3 by the feed line 4 and the feed line As shown in FIG. 1, in the dual-polarized planar antenna configured so that the excitation directions of the radiating elements 7 by the
, The element arrangement interval P1 in the excitation direction of the radiating element 7 is set to approximately 0.813 times the free space wavelength of the first use frequency, the number of array elements is set to a multiple of 16, and
An output terminal of the feed line 8 is used as an input terminal of a second frequency corresponding to about 1.14 times the first use frequency, and an output terminal of the feed line 4 is used as an input terminal of the first use frequency. It is characterized in that it is used as an output terminal.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, in a dual-polarized triplate type planar antenna according to the present invention, an element arrangement interval P2 in a direction orthogonal to the excitation direction of the radiating element 7 by the feed line 8 is set. Is set to approximately 0.879 times the free space wavelength of the first use frequency, the number of array elements is a multiple of 15, and the output terminal of the feed line 8 is set to about 1.14 of the first use frequency. The output terminal of the feed line 4 can be used as an output terminal of the first use frequency while being used as an input terminal of the second frequency corresponding to the double frequency.

Further, in the dual-polarized triplate type planar antenna of the present invention, as shown in FIG. 3, the element arrangement interval P1 in the excitation direction of the radiating element 7 by the feed line 8 is set to the free space of the first use frequency. The wavelength is set to approximately 0.725 times and the number of array elements is set to 20. The element array interval P2 in the direction orthogonal to this is set to approximately 0.879 times the free space wavelength of the first use frequency. The number of arranged elements is 20 and a passive element portion or an element missing portion corresponding to each of 20 elements is formed in the second row from both ends of the power supply substrate 5 in the direction of the arrangement interval P1. An output terminal of the line 8 is used as an input terminal of a second frequency corresponding to about 1.14 times the first use frequency, and an output terminal of the feed line 4 is used as an output terminal of the first use frequency. Can also be used as Kill.

In FIG. 3, the element arrangement interval P
1 is set to approximately 0.708 times the free space wavelength of the first use frequency, as shown in FIG. 4, and the parasitic element portion in the second row from both ends in the arrangement interval P1 direction, or ,
The element missing portions can be formed corresponding to 24 elements each.

In the dual-polarized planar antenna according to the present invention, as shown in FIG. 1, the element arrangement interval P1 is set to approximately 0.813 times the free space wavelength of the first use frequency, and the number of arrangement elements is reduced. When the output terminal of the feed line 4 is used as the output terminal of the first use frequency, the directivity of the feed line 4 in a plane orthogonal to the excitation direction of the radiating element 3 is shown in FIG. As shown, the maximum arrival direction of the interfering radio wave from the adjacent communication satellite, that is, ±
Null points are formed in the directions of 4.4 °, ± 8.8 °, and ± 13.2 °, and when receiving at the first use frequency, the influence of interference radio waves from adjacent communication satellites can be reduced. .

A dual-polarized planar antenna according to the present invention comprises:
As shown in FIG. 2, the element arrangement interval P2 is set to approximately 0.879 times the free space wavelength of the first use frequency and the number of array elements is set to a multiple of 15, so that the output terminal of the feed line 4 Is used as the output terminal of the first use frequency, the directivity of the excitation direction of the radiating element 3 by the feed line 4 also becomes the maximum arrival direction of the interference radio wave from the adjacent communication satellite as shown in FIG. ± from main radiation direction
Since null points can be formed in the directions of 4.4 °, ± 8.8 °, and ± 13.2 °, the configuration of FIG. 2 is applied to the case of a polarization direction orthogonal to the polarization direction of the configuration of FIG. Can respond to.

Further, in the case shown in FIG. 3, the element arrangement interval P1 in the excitation direction of the radiation element 7 by the feed line 8 is simply used.
Is approximately 0.725 of the free space wavelength of the first use frequency.
The number of array elements is set to 20 elements, the element array interval P2 in the direction orthogonal to this is set to approximately 0.879 times the free space wavelength of the first use frequency, and the number of array elements is set to 2
If only the 0 element is used, the directivity of the feed line 4 in a plane orthogonal to the excitation direction of the radiating element 3 is ±± from the main radiation direction.
Although null points cannot be formed in the directions of 4.4 °, ± 8.8 °, and ± 13.2 °, 20 elements are respectively equivalent in the second row from both ends in the direction of the arrangement interval P1 of the power supply substrate 5. By forming the parasitic element part or the element missing part of FIG.
Null points can be formed as shown in FIG.

Also, in the case shown in FIG. 4, the element arrangement interval P1 in the excitation direction of the radiating element 7 by the feed line 8 is simply described.
Is approximately 0.708 of the free space wavelength of the first use frequency.
The number of array elements is set to 20 elements, the element array interval P2 in the direction orthogonal to this is set to approximately 0.879 times the free space wavelength of the first use frequency, and the number of array elements is set to 2
If only the 0 element is used, the directivity of the feed line 4 in a plane orthogonal to the excitation direction of the radiating element 3 is ±± from the main radiation direction.
Although null points cannot be formed in the directions of 4.4 °, ± 8.8 °, and ± 13.2 °, 24 elements are equivalent in the second row from both ends of the feed board 5 in the direction of the arrangement interval P1. By forming the passive element portion or the element missing portion for each minute, a null point as shown in FIG. 5 can be formed.

On the other hand, in the configuration of FIG. 1, if the output terminal of the feed line 8 is used as the input terminal of the second frequency corresponding to about 1.14 times the first use frequency, Since the element arrangement interval P1 set to approximately 0.813 times the free space wavelength corresponds to approximately 0.926 times the free space wavelength of the second frequency, high efficiency characteristics are maintained for the second frequency. Further, since the radiating element 3 acts as a parasitic element with respect to the radiating element 7, the directivity of the radiating element itself is narrowed in the main radiation direction, and the power supplied to each element when the array is formed is reduced. Even if the amplitude and phase distributions are uniform without controlling the distribution, good directivity with little disturbance can be obtained as shown in FIG. 6, so that efficiency is reduced when transmitting at the second frequency. Messages to be sent without It is possible to suppress the jamming of the adjacent communication satellite other than the satellite.

In the configuration shown in FIG. 2, similarly, the element arrangement interval PI in the excitation direction of the radiating element 7 by the feed line 8 is used.
May be set so as to maintain high efficiency characteristics with respect to the free space wavelength of the second frequency. In the configuration of FIG. 3 as well, it is set to approximately 0.725 times the free space wavelength of the first use frequency. Since the element arrangement interval P1 is equivalent to approximately 0.827 times the free space wavelength of the second frequency, high efficiency characteristics can be maintained for the second frequency. Even in the configuration of FIG. Approximately 0.708 of free space wavelength of use frequency
Since the doubled element arrangement interval P1 is equivalent to approximately 0.804 times the free space wavelength of the second frequency, high efficiency characteristics can be maintained for the second frequency. Further, as in the configuration of FIG. 1, the radiating element 3 acts as a parasitic element to the radiating element 7, so that the directivity of the radiating element itself is narrowed in the main radiation direction, and power is supplied to each element when an array is formed. Even if the distribution is uniform without controlling the distribution of the power amplitude and phase, good directivity with little disturbance as shown in FIG. 6 can be obtained. It is possible to suppress interference radio waves to adjacent communication satellites other than the communication satellite to be transmitted without lowering.

[0017]

【Example】

Example 1 In the configuration shown in FIG. 7, an aluminum plate having a thickness of 0.5 mm as the ground conductors 1 and 15 and a thickness of 1 mm as the ground conductor 11 and a size of 450 mm each was used.
And 13, a polyethylene foam having a thickness of 1 mm and a relative dielectric constant of about 1.1 was used. Further, as power supply substrates 5 and 9, a substrate in which a 35 μm thick copper foil was bonded to a 25 μm thick PET film was used. An antenna circuit including the radiating element 3 and the feeding line 4 was formed on the feeding substrate 5, and an antenna circuit including the radiating element 7 and the feeding line 8 was formed on the feeding substrate 9 by removing unnecessary portions of the copper foil by etching. Slots 12 and 14 were formed by pressing at positions corresponding to the radiating elements 3 and 7 of the ground conductors 1 and 15. Further, the dimension of the radiating element 3 in the excitation direction by the feed line 4 is set to a free space wavelength λ (= 24 m) of the first use frequency 12.5 GHz.
m), and the dimension in the direction orthogonal to this is about 0.25 times, and the dimension of the radiating element 7 in the excitation direction by the feed line 8 is the first use frequency 12.5.
About 0.3 for a free space wavelength λ (= 24 mm) of GHz.
The length in the direction perpendicular to this is about 0.33 times, and the length of each of the slots 12 and 14 is about 0.2 with respect to the free space wavelength λ (= 24 mm) of the first use frequency 12.5 GHz. It was a 54 times square. With the above configuration,
As shown in FIG. 1, the element arrangement interval P1 is set to 19.5 mm, which is about 0.813 times the free space wavelength λ (= 24 mm) of the first use frequency 12.5 GHz, and P
The number of array elements in one direction was set to 16 elements. Further, the element arrangement interval P2 in the direction orthogonal to this is set to the first use frequency 1
It is set to 21.1 mm, which is about 0.879 times the free space wavelength λ (= 24 mm) of 2.5 GHz, and P2
The number of elements in the direction was 20 elements, and the amplitude of the power supplied to each element was made uniform, and all the elements were excited in the same phase. The first use frequency of this antenna is 12.5 GH
As shown in FIG. 5, the directivity in the P1 direction at z is ± 4.4 °, ± 8.8 °, ± 13.2 ° from the maximum arrival direction of interference radio waves from adjacent communication satellites, that is, the main radiation direction. A null point was formed in the direction. Further, the output terminal of the feed line 8 is connected to a second terminal corresponding to about 1.14 times the first use frequency.
As for the directivity in the P1 direction when used as an input terminal having a frequency of 14.25 GHz, as shown in FIG. 6, a good directivity with less disturbance below a specified level over a wide angle range was obtained.

Embodiment 2 As shown in FIG. 2, the element arrangement interval P2 is set to 21.1 mm which is about 0.879 times the free space wavelength λ (= 24 mm) of the first use frequency 12.5 GHz. ,And,
The number of array elements in the P2 direction was set to 15 elements. Further, the element arrangement interval P1 in the direction orthogonal to this is set to the first use frequency 1
It is set to 19.5 mm, which is about 0.813 times the free space wavelength λ (= 24 mm) of 2.5 GHz, and P1
An antenna was manufactured in the same manner as in Example 1, except that the number of array elements in the direction was changed to 20. The directivity of the present antenna in the P2 direction at the first use frequency of 12.5 GHz is shown in FIG.
As shown in the figure, the maximum arrival direction of interference radio waves from adjacent communication satellites, that is, ± 4.4 °, ± 8.8 ° from the main radiation direction,
A null point was formed in the direction of ± 13.2 °. Further, the output terminal of the feed line 8 is set to about 1.14 of the first use frequency.
As shown in FIG. 6, the directivity in the P2 direction when used as an input terminal having a second frequency of 14.25 GHz, which is twice as large, has good directivity with less disturbance below a specified level over a wide angle range. Obtained.

Embodiment 3 As shown in FIG. 3, the element arrangement interval P1 is set to 17.4 mm which is about 0.725 times the free space wavelength λ (= 24 mm) of the first use frequency 12.5 GHz. ,And,
The number of array elements in the P1 direction was set to 20 elements. Also, the element arrangement interval P2 in the direction orthogonal to this is set to the first use frequency 1
It is set to 21.1 mm, which is about 0.879 times the free space wavelength λ (= 24 mm) of 2.5 GHz, and P2
The number of array elements in the direction is also 20 elements, and
An antenna was manufactured in the same manner as in Example 1 except that parasitic elements corresponding to 20 elements were formed in the second row from both ends in the direction of the arrangement interval P1. As shown in FIG. 5, the directivity in the P2 direction at the first use frequency 12.5 GHz of the present antenna indicates the maximum arrival direction of the interference radio wave from the adjacent communication satellite,
That is, ± 4.4 °, ± 8.8 °, ± 1 from the main radiation direction
A null point was formed in the direction of 3.2 °. FIG. 6 shows the directivity in the P2 direction when the output terminal of the feed line 8 is used as an input terminal of the second frequency 14.25 GHz corresponding to about 1.14 times the first use frequency. As described above, good directivity with less disturbance below a specified level was obtained over a wide angle range.

Embodiment 4 As shown in FIG. 4, the element arrangement interval P1 is set to 16.9 mm which is about 0.708 times the free space wavelength λ (= 24 mm) of the first use frequency 12.5 GHz. ,And,
The number of array elements in the P1 direction was set to 20 elements. Also, the element arrangement interval P2 in the direction orthogonal to this is set to the first use frequency 1
It is set to 21.1 mm, which is about 0.879 times the free space wavelength λ (= 24 mm) of 2.5 GHz, and P2
The number of array elements in the direction is also 20 elements, and
An antenna was manufactured in the same manner as in Example 1 except that parasitic elements corresponding to 24 elements were formed in the second row from both ends in the direction of the arrangement interval P1. As shown in FIG. 5, the directivity in the P2 direction at the first use frequency 12.5 GHz of the present antenna indicates the maximum arrival direction of the interference radio wave from the adjacent communication satellite,
That is, ± 4.4 °, ± 8.8 °, ± 1 from the main radiation direction
A null point was formed in the direction of 3.2 °. FIG. 6 shows the directivity in the P2 direction when the output terminal of the feed line 8 is used as an input terminal of the second frequency 14.25 GHz corresponding to about 1.14 times the first use frequency. As described above, good directivity with less disturbance below a specified level was obtained over a wide angle range.

[0021]

As described above, when the output terminal of the feed line 4 is used as the output terminal of the first use frequency according to the present invention, the maximum arrival direction of the interference radio wave from the adjacent communication satellite, that is, from the main radiation direction. ± 4.4 ゜, ± 8.8 ゜,
When a null point is formed in the direction of ± 13.2 ° and reception is performed at the first use frequency, the influence of interference radio waves from an adjacent communication satellite can be reduced. Further, when the output terminal of the feed line 8 is used as an input terminal of a second frequency corresponding to about 1.14 times the first use frequency, the radiating element 3 acts as a parasitic element with respect to the radiating element 7. Therefore, even if the directivity of the radiating element itself is narrowed down in the main radiation direction and an array is configured, even if the distribution of the amplitude and phase of the power supply to each element is made uniform without controlling the distribution. Since good directivity with little disturbance can be obtained, when transmitting at the second frequency, it is possible to suppress interference radio waves to adjacent communication satellites other than the communication satellite to be transmitted without lowering the efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view of power supply boards 5 and 9 showing one embodiment of the present invention.

FIG. 2 shows power supply substrates 5 and 9 showing another embodiment of the present invention.
FIG.

FIG. 3 shows power supply substrates 5 and 9 showing another embodiment of the present invention.
FIG.

FIG. 4 shows power supply substrates 5 and 9 showing another embodiment of the present invention.
FIG.

FIG. 5 is a diagram showing directivity characteristics at a first use frequency according to one embodiment of the present invention.

FIG. 6 is a diagram showing directivity characteristics at a second use frequency according to one embodiment of the present invention.

FIG. 7 is a perspective view showing a basic configuration of an antenna according to the present invention.

[Explanation of symbols]

 1. Ground conductor 2. Dielectric 3. Radiating element 4. Feeding line 5. Power supply board 6. Dielectric 7. Radiating element 8. Feeding line 9. Power supply board 10. Dielectric 11 Ground conductor 12. Slot 13. Dielectric 14. Slot 15. Earth conductor

Claims (4)

[Claims] A feeder board on which a plurality of radiating elements and a feeder line are formed;
And a ground conductor 1 having a plurality of slots 12 installed such that each slot 12 is located directly above the radiating element 7.
, A dielectric 2, a feed substrate 5 on which a plurality of radiating elements 3 and a feed line 4 are formed, a dielectric 13, and a plurality of slots provided such that each slot 14 is located directly above the radiating element 3. And a ground conductor 15 having a radiating element 14 are stacked in this order, and the radiating element 3 and the radiating element 7 are electromagnetically coupled,
In addition, in the dual-polarized planar antenna configured so that the excitation direction of the radiation element 3 by the feed line 4 and the excitation direction of the radiation element 7 by the feed line 8 are orthogonal to each other, the excitation direction of the radiation element 7 by the feed line 8 is Element arrangement interval P1
Is approximately 0.813 of the free space wavelength of the first use frequency.
At the same time, the number of array elements is set to a multiple of 16, and the output terminal of the feed line 8 is used as an input terminal of a second use frequency corresponding to about 1.14 times the first use frequency. And an output terminal of the feed line 4 is used as an output terminal of the first use frequency. 2. A feeder board 9 on which a ground conductor 11, a dielectric 10, a plurality of radiating elements 7 and feeder lines 8 are formed, and a dielectric 6
And a ground conductor 1 having a plurality of slots 12 installed such that each slot 12 is located directly above the radiating element 7.
, A dielectric 2, a feed substrate 5 on which a plurality of radiating elements 3 and a feed line 4 are formed, a dielectric 13, and a plurality of slots provided such that each slot 14 is located directly above the radiating element 3. And a ground conductor 15 having a radiating element 14 are stacked in this order, and the radiating element 3 and the radiating element 7 are electromagnetically coupled,
Further, in the dual-polarized planar antenna configured so that the excitation direction of the radiation element 3 by the feed line 4 and the excitation direction of the radiation element 7 by the feed line 8 are orthogonal to each other, the excitation direction of the radiation element 7 by the feed line 8 The element arrangement interval P2 in the orthogonal direction is set to approximately 0.879 times the free space wavelength of the first use frequency, the number of array elements is set to a multiple of 15, and the output terminal of the feed line 8 is It is used as an input terminal of a second frequency corresponding to about 1.14 times the first use frequency, and an output terminal of the feed line 4 is used as an output terminal of the first use frequency. Dual-polarized planar antenna. 3. A feeder board 9 on which a ground conductor 11, a dielectric 10, a plurality of radiating elements 7 and a feeder line 8 are formed, and a dielectric 6
And a ground conductor 1 having a plurality of slots 12 installed such that each slot 12 is located directly above the radiating element 7.
, A dielectric 2, a feed substrate 5 on which a plurality of radiating elements 3 and a feed line 4 are formed, a dielectric 13, and a plurality of slots provided such that each slot 14 is located directly above the radiating element 3. And a ground conductor 15 having a radiating element 14 are stacked in this order, and the radiating element 3 and the radiating element 7 are electromagnetically coupled,
In addition, in the dual-polarized planar antenna configured so that the excitation direction of the radiation element 3 by the feed line 4 and the excitation direction of the radiation element 7 by the feed line 8 are orthogonal to each other, the excitation direction of the radiation element 7 by the feed line 8 is Element arrangement interval P1
Is approximately 0.725 of the free space wavelength of the first use frequency.
The number of array elements is set to 20 elements, the element array interval P2 in the direction orthogonal to this is set to approximately 0.879 times the free space wavelength of the first use frequency, and the number of array elements is set to 2
A passive element portion or an element missing portion corresponding to 20 elements each in the second column from both ends in the direction of the arrangement interval P1 of the power supply board 5 and the output of the power supply line 8 The terminal is connected to about 1.14 of the first use frequency.
2. A dual-polarized planar antenna, wherein the antenna is used as an input terminal of a second frequency corresponding to the frequency, and an output terminal of the feed line 4 is used as an output terminal of the first use frequency. 4. An element arrangement interval P1 is set to approximately 0.705 times the free space wavelength of the first use frequency, and a parasitic element portion in a second column from both ends in the arrangement interval P1 direction, or 4. The dual-polarized planar antenna according to claim 3, wherein each of the element missing portions corresponds to 24 elements.