JP2018093387A - Antenna feeder circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna feeder circuit, exciting circular polarization, capable of achieving low cross polarization while maintaining a compact size.SOLUTION: A 90-degree two-distribution circuit 6 is connected with a low-range right-handed circular polarization terminal 7 and a low-range left-handed circular polarization terminal 8 to distribute a radio wave at a 90-degree phase difference. A phase adjustment circuit 5 is connected with the 90-degree two-distribution circuit 6 and is constituted of a bypass waveguide. An antiphase two-distribution circuit 4 is connected with the phase adjustment circuit 5 to further distribute each of two radio waves distributed by the 90-degree two-distribution circuit 6. An OMJ 2 is connected with the antiphase two-distribution circuit 4 and connected with a radiation antenna terminal 1 to synthesize the radio wave distributed by the antiphase two-distribution circuit 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an antenna feeding circuit connected to an antenna.

  In a multi-beam antenna using a reflecting mirror, a horn antenna that is a primary radiator of the reflecting mirror is arranged at a position corresponding to the beam direction. In order to realize a two-dimensionally densely arranged beam arrangement, it is necessary to arrange the horn antennas densely, and it is necessary to configure a feeding circuit connected to the horn antennas in a compact manner. In order to realize low cross polarization, it is necessary to process with sufficiently high dimensional accuracy, or to reduce the difference from the design phase value by some phase adjustment mechanism. General processing accuracy is determined, and it may take a very long processing time to increase the processing accuracy. Further, when the adjustment mechanism is provided, the circuit is generally increased in size. In the circularly polarized antenna feeding circuit, it is necessary to adjust the phase for each path to a desired value, and it is necessary to adjust the path length with high accuracy.

  Patent Document 1, Patent Document 2, and Patent Document 3 disclose the configuration of a feed circuit that excites circularly polarized waves, but neither disclose nor suggest a method for adjusting the phase of the feed circuit.

Japanese Patent Application No. 10-348524 US Patent Application Publication No. 2010/0007432 US Patent Application No. 7408427

  In a circularly polarized antenna feeding circuit, matching the phase of each path to a desired value is important for low cross polarization. However, when an antenna feeding circuit is manufactured, there is a problem in that the circuit dimensions change due to manufacturing errors, the phase of radio waves propagating in the antenna feeding circuit differs, and low cross polarization characteristics cannot be realized. In particular, in the case of a high frequency, a phase difference with respect to a realizable processing error cannot be allowed. On the other hand, when the phase adjustment structure is provided, there is a problem that the circuit becomes large.

  An object of the present invention is to realize low cross polarization in an antenna feeding circuit that excites circular polarization. It is another object of the present invention to maintain the small size of the antenna feeding circuit while realizing low cross polarization.

An antenna feeding circuit according to the present invention is an antenna feeding circuit including a radiating antenna terminal connected to an antenna and a first circularly polarized wave terminal for inputting and outputting radio waves.
A 90 degree two distribution circuit that is connected to the first circularly polarized wave terminal and distributes radio waves into two with a phase difference of 90 degrees;
A phase adjustment circuit connected to the 90 degree two distribution circuit and composed of a bypass waveguide;
A distributor that is connected to the phase adjustment circuit and further distributes each of the radio waves divided into two by the 90 degree two distribution circuit;
A demultiplexer that is connected to the distributor and connected to the radiation antenna terminal, and synthesizes the radio waves distributed by the distributor.

  The phase adjustment circuit is composed of a bypass waveguide having an E-plane bent.

  According to the antenna feeding circuit according to the present invention, since the phase adjustment circuit by the detour waveguide bent in the E plane is provided between the distributor and the 90 degree two distribution circuit, low cross polarization can be realized. it can. In addition, the antenna feeding circuit can be kept downsized while realizing low cross polarization.

1 is a circuit configuration diagram of an antenna power feeding circuit 100 according to Embodiment 1. FIG. 1 is a bird's-eye view of an antenna power feeding circuit 100 according to Embodiment 1. FIG. 1 is a side view of an antenna power feeding circuit 100 according to Embodiment 1. FIG. FIG. 6 is a bird's-eye view of an antenna feeding circuit 100 according to another example of the first embodiment. FIG. 6 is a side view of an antenna power feeding circuit 100 according to another example of the first embodiment. FIG. 4 is a diagram showing an E-plane bending phase adjustment circuit 5a that is an example of the phase adjustment circuit 5 according to the first embodiment. The figure which shows the H surface bending phase adjustment circuit 5b which is a comparative example for comparing with the phase adjustment circuit 5 which concerns on Embodiment 1. FIG. FIG. 5 is a diagram showing another example of the E-plane bending phase adjustment circuit 5a according to the first embodiment. FIG. 5 is a circuit configuration diagram of an antenna power feeding circuit 100a according to Embodiment 2. FIG. 6 is a bird's-eye view of an antenna feeding circuit 100a according to the second embodiment. The side view of the antenna electric power feeding circuit 100a which concerns on Embodiment 2. FIG. FIG. 10 is a bird's-eye view of an antenna power feeding circuit 100b according to the third embodiment. FIG. 6 is a side view of an antenna power feeding circuit 100b according to Embodiment 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure. In the description of the embodiments, the description of the same or corresponding parts will be omitted or simplified as appropriate.

Embodiment 1 FIG.
*** Explanation of configuration ***
FIG. 1 is a circuit configuration diagram of an antenna feeding circuit 100 according to the present embodiment. FIG. 2 is a bird's-eye view of the antenna feeding circuit 100 according to the present embodiment. FIG. 3 is a side view of FIG.
In this embodiment, an antenna feeding circuit 100 that handles radio waves such as high-frequency circularly polarized waves or low-frequency circularly polarized waves will be described. A specific example of the high-frequency circularly polarized wave is a high-frequency circularly polarized wave such as a microwave or a millimeter wave. The low-frequency circularly polarized wave is a circularly polarized wave having a lower frequency than the high-frequency circularly polarized wave.
The antenna power supply circuit 100 includes a radiating antenna terminal 1 connected to an antenna and a first circularly polarized wave terminal 110 as input / output terminals. The antenna feeding circuit 100 includes a low-frequency right-hand circularly polarized terminal 7 and a low-frequency left-hand circularly polarized terminal 8 as the first circularly polarized terminal 110. In addition, the antenna power supply circuit 100 further serves as a second circularly polarized wave terminal 140 that is an input / output terminal, and further inputs and outputs a radio wave having a higher frequency than the radio wave input and output by the first circularly polarized wave terminal 110. A circularly polarized wave terminal 10 and a high-frequency left-handed circularly polarized wave terminal 11 are provided.

As described above, the antenna feeding circuit 100 according to the present embodiment has the low-frequency right-hand circularly polarized wave terminal 7, the low-frequency left-hand circularly-polarized terminal 8, and the high-frequency right-handed circularly polarized wave terminal 10 as input / output terminals. The high-frequency left-handed circularly polarized wave terminal 11 and the radiation antenna terminal 1.
The antenna power supply circuit 100 includes an LPF 3, an OMJ 2, a circularly polarized wave generator 9, an antiphase 2 distribution circuit 4, a phase adjustment circuit 5, and a 90 degree 2 distribution circuit 6. LPF is a low-pass filter and is an abbreviation for Low Pass Filter. OMJ is an abbreviation for Ortho-Mode Junction having a high-pass function and a low-pass distribution function. The circularly polarized wave generator 9 is also called a high-frequency circularly polarized wave generator.

  Usually, the low-frequency right-handed circularly polarized wave terminal 7, the low-frequency left-handed circularly-polarized wave terminal 8, the high-frequency right-handed circularly polarized wave terminal 10, and the high-frequency left-handed circularly polarized wave terminal 11 are rectangular waveguides, and are radiating antennas. The terminal 1 is a circular waveguide, but is not necessarily limited thereto. Moreover, each circuit is not necessarily physically independent, and may be manufactured as an integral structure.

The 90 degree two distribution circuit 6 is arranged between the phase adjustment circuit 5 and the first circularly polarized wave terminal 110, and distributes the radio wave into two with a phase difference of 90 degrees. Alternatively, the 90 degree two distribution circuit 6 synthesizes two radio waves having a phase difference of 90 degrees.
The 90 degree two distribution circuit 6 is, for example, a branch line coupler. Here, a four-stage branch line coupler is shown as an example of the 90-degree two-distribution circuit 6, but the number of stages is not limited.

  The phase adjustment circuit 5 is connected to a 90 ° two-distribution circuit and includes a bypass waveguide having an E-plane bent.

The distributor 120 is connected to the phase adjustment circuit 5, and further distributes each of the radio waves divided into two by the 90 degree two distribution circuit 6. The distributor 120 is a reverse-phase two distribution circuit 4 that distributes radio waves into two in opposite phases. Further, distributor 120 combines the radio waves demultiplexed into four by the demultiplexer 130 into two radio waves having opposite phases.
That is, the distributor 120 is the anti-phase two distribution circuit 4 that distributes radio waves into two in opposite phases, or synthesizes two anti-phase radio waves.

  The polarization demultiplexer 130 is connected to the distributor 120 and is connected to the radiating antenna terminal 1, and synthesizes the radio waves distributed by the distributor 120. The demultiplexer 130 demultiplexes the radio wave input to the radiation antenna terminal 1 into four. The polarization demultiplexer 130 is an OMJ 2 that allows high-frequency radio waves to pass therethrough and synthesizes or demultiplexes low-frequency radio waves below the high-frequency.

LPF3, which is a low-pass filter, is disposed between distributor 120 and OMJ2.
The circularly polarized wave generator 9 is disposed between the second circularly polarized wave terminal 140 composed of the high frequency clockwise circularly polarized wave terminal 10 and the high frequency counterclockwise circularly polarized wave terminal 11 and the OMJ2.

*** Explanation of operation ***
<Operation of Antenna Feeder Circuit 100 of Low Frequency>
First, the operation of the low frequency antenna feed circuit 100 will be described.
In the present embodiment, a case where a radio wave input from a low frequency terminal is output to the radiating antenna terminal 1 via the antenna feeding circuit 100 will be described. It may be output to the band terminal.
The radio wave input from the low-frequency right-hand circularly polarized wave terminal 7 is divided into two with a 90-degree phase difference added by the 90-degree 2-distribution circuit 6. Each radio wave passes through the phase adjustment circuit 5 and is further divided into two in the opposite phase in the opposite phase two distribution circuit 4. At this time, when an in-phase distribution circuit is used instead of the anti-phase 2 distribution circuit 4, one phase is adjusted to be in reverse phase.

FIG. 4 is a bird's-eye view of an antenna feeding circuit 100 according to another example of the present embodiment.
FIG. 5 is a side view of FIG.
2 and 3, a T-branch circuit is assumed as the antiphase two distribution circuit 4. However, as shown in FIGS. 4 and 5, a magic T circuit 4a in which an in-phase distribution terminal is terminated by a waveguide terminator 4b may be used.

  The four distributed radio waves pass through the LPF 3, are synthesized as right-hand circularly polarized radio waves at the OMJ 2, and are output from the radiation antenna terminal 1. A horn antenna is connected to the radiation antenna terminal 1 to radiate radio waves.

  The antenna feeding circuit 100 has reversibility, and when a low-frequency right-handed circularly polarized radio wave is input from the radiating antenna terminal 1, the antenna feed circuit 100 follows a path opposite to the above and is low-pass right-handed circularly polarized wave. A radio wave is output from the terminal 7. The radio wave input from the low-frequency left-hand circularly polarized wave terminal 8 passes through the same path as that inputted from the low-frequency right-handed circularly polarized wave terminal 7 except that the phase relationship of the radio waves is different. 1 is output as a left-handed circularly polarized wave. Similarly, when a low-frequency left-hand circularly polarized radio wave is input from the radiating antenna terminal 1, the radio wave is output from the low-frequency left-hand circularly polarized wave terminal 8.

<Operation of Antenna Feeder Circuit 100 of High Frequency>
Next, the operation of the high frequency antenna feed circuit 100 will be described.
In the present embodiment, a case where a radio wave input from the high frequency terminal is output to the radiating antenna terminal 1 via the antenna feeding circuit 100 will be described. It may be output to the band terminal.
A radio wave input from the high-frequency right-hand circularly polarized wave terminal 10 is converted into a right-handed circularly polarized wave by the circularly polarized wave generator 9, passes through the OMJ 2, and is output from the radiating antenna terminal 1. Here, since the high frequency radio wave cannot pass through the LPF 3, it does not propagate to the 2-distribution circuit.
The antenna feeding circuit 100 has reversibility, and when a high-frequency right-handed circularly polarized radio wave is input from the radiating antenna terminal 1, the high-frequency right-handed circularly polarized wave terminal 10 follows a path opposite to the above. Is output from. Similarly, a radio wave input from the high-frequency left-hand circularly polarized wave terminal 11 is converted into a left-handed circularly polarized wave by the circularly polarized wave generator 9, passes through the OMJ 2, and is output from the radiation antenna terminal 1. Similarly, when a high-frequency left-handed circularly polarized wave is input from the radiating antenna terminal 1, it is output from the high-frequency left-handed circularly polarized wave terminal 11.

  In FIGS. 2 and 3, assuming a septum polarizer having functions of linear-circular polarization conversion and polarization separation, circular polarization is directly synthesized by only the circular polarization generator 9. Circular polarization may be synthesized by combining a circular polarization conversion circuit and a polarization separation circuit.

  Above, description of operation | movement of the antenna electric power feeding circuit 100 which concerns on this Embodiment is complete | finished.

*** Explanation of effects of this embodiment ***
In a circularly polarized antenna feeding circuit, it is important to match the phase of each path to a desired value in order to realize low cross polarization. Designed so that the phases are aligned when there is no dimensional processing error, but the circuit dimensions change due to manufacturing errors, resulting in a difference in the phase of the radio wave propagating in the antenna feed circuit, resulting in low cross polarization characteristics. Cannot be realized. In general, manufacturing errors cannot be eliminated, and phase differences with respect to processing errors that can be realized cannot be tolerated particularly at high frequencies. On the other hand, when the phase adjustment structure is provided, there is a problem that the circuit becomes large depending on the structure.

A radio wave input from the low-frequency right-hand circularly polarized terminal 7 or the low-frequency left-hand circularly polarized terminal 8 is distributed by the 90 ° two-distribution circuit 6. However, if an error occurs in the length of the path leading to the two anti-phase two distribution circuits 4, the circular deviation when combined by the OMJ 2 via the LPF 3 after being distributed by the anti-phase two distribution circuit 4 will be described. Degradation of wave characteristics.
Further, when an error occurs in the path from the anti-phase 2 distribution circuit 4 to the OMJ 2 via the LPF 3, a reflected wave is generated in the OMJ 2 portion. However, when the magic T circuit 4a is used as the anti-phase two distributor, it is terminated at the in-phase distribution terminal.
When a T-branch circuit is used as the anti-phase 2 distribution circuit 4, a standing wave may be generated between the anti-phase 2 distribution circuit 4 and the OMJ 2 to deteriorate the circular polarization characteristic. Therefore, when a T-branch circuit is used as the anti-phase 2 distribution circuit 4, it is necessary to align the phases between the anti-phase 2 distribution circuit 4 and the OMJ 2.
As described above, the phase adjustment between the anti-phase two distributor circuit 4 and the OMJ 2 can be avoided by using the magic T circuit as the anti-phase two distributor. However, since the phase difference in the path from the 90 degree two distribution circuit 6 to the opposite phase two distribution circuit 4 is finally cross-polarized unless corrected in that path, it is opposite to the 90 degree two distribution circuit 6. Phase adjustment between the phase 2 distribution circuits 4 is essential. The phase difference can be adjusted by the structure. However, if the phase is adjusted by a method other than changing the path length, the phase amount has frequency characteristics, so the cross-polarized wave is wideband. It is not possible.

Therefore, in the antenna feeding circuit 100 according to the present embodiment, the phase adjustment circuit 5 is provided between the 90 degree two distribution circuit 6 and the antiphase two distribution circuit 4. The phase adjustment circuit 5 according to the present embodiment adjusts the phase by changing the path length in the bypass path of the waveguide. As described above, the phase adjustment by the phase adjustment circuit 5 is possible, so that the difference in the phase of the radio wave propagating in the antenna feeding circuit can be suppressed, and a low cross polarization characteristic can be realized in a wide band.
FIG. 6 is a diagram showing an E-plane bending phase adjustment circuit 5a that is an example of the phase adjustment circuit 5 according to the present embodiment. FIG. 7 is a diagram showing an H-plane bending phase adjustment circuit 5b which is a comparative example for comparison with the phase adjustment circuit 5 according to the present embodiment. FIG. 8 is a diagram showing another example of the E-plane bending phase adjustment circuit 5a according to the present embodiment.

As shown in FIG. 6, the E-plane bending phase adjustment circuit 5a guides the input / output terminals of the 90-degree 2-distribution circuit 6 and the anti-phase 2-distribution circuit 4 so that the wide wall surface of the waveguide can be bent. Adjust tube orientation and position. In the E-plane bending phase adjustment circuit 5a, the wide wall surface of the waveguide is bent in the E-plane. The E-plane bending phase adjustment circuit 5a can reduce the bending radius as compared with the case where the narrow wall surface of the waveguide shown in FIG. Can be realized.
Note that the phase adjustment circuit 5 may perform phase adjustment by replacing the entire detour for phase adjustment. Alternatively, the phase adjustment circuit 5 may be formed so that a part of the bypass waveguide can be divided. As shown in FIG. 8, a part of the detour may be divided and a part of the detour may be cut, or the phase may be adjusted using a small piece for adjustment such as a shim. The position of the dividing surface 12 to be divided may be arbitrarily changed.

  Further, in the antenna power feeding circuit 100 according to the present embodiment, the branch line coupler is used as the 90 ° two-distribution circuit 6, so that the connection with the E-plane bending phase adjustment circuit 5 a shown in FIG. 6 becomes easier. Therefore, the entire antenna feeding circuit can be reduced in size. The 90 degree two distribution circuit 6 only needs to have a function of distributing radio waves into two with a 90 degree phase difference, and may not be a branch line coupler.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.
In this embodiment, the same components as those described in Embodiment 1 are denoted by the same reference numerals, and the description thereof may be omitted.

*** Explanation of configuration ***
The principle of the present embodiment will be described with reference to FIG. 9, FIG. 10, and FIG.
FIG. 9 is a circuit configuration diagram of the antenna feeding circuit 100a according to the present embodiment.
FIG. 10 is a bird's-eye view of the antenna feeding circuit 100a according to the present embodiment.
FIG. 11 is a side view of FIG.

The antenna power supply circuit 100a according to the present embodiment includes a right-handed circularly polarized wave terminal 7a, a left-handed circularly polarized wave terminal 8a, and a radiating antenna terminal 1 as input / output terminals. The antenna power supply circuit 100a includes an OMT 2a, an anti-phase two distribution circuit 4, a phase adjustment circuit 5, and a 90 degree two distribution circuit 6. OMT2a is an abbreviation for Ortho-Mode Transducer. The right-handed circularly polarized wave terminal 7a is an example of a low-frequency right-handed circularly polarized wave terminal. The left-handed circularly polarized wave terminal 8a is an example of a low-frequency left-handed circularly polarized wave terminal.
Normally, the right-handed circularly polarized wave terminal 7a and the left-handed circularly polarized wave terminal 8a are rectangular waveguides, and the radiating antenna terminal 1 is a circular waveguide, but it is not necessarily limited thereto. Moreover, each circuit is not necessarily physically independent, and may be manufactured as an integral structure.

*** Explanation of operation ***
Next, the operation of the antenna power feeding circuit 100a according to this embodiment will be described. In the present embodiment, a case where a radio wave input from a circularly polarized wave terminal is output to the radiating antenna terminal 1 via the antenna feeding circuit 100a will be described. You may output to a polarization terminal.

The radio wave input from the right-handed circularly polarized wave terminal 7a is divided into two parts with a phase difference of 90 degrees by the 90 degree two distribution circuit 6. Each radio wave passes through the phase adjustment circuit 5 and is further divided into two in the opposite phase by the opposite phase two distribution circuit 4. At this time, when an in-phase distribution circuit is used instead of the anti-phase 2 distribution circuit 4, one phase is adjusted to be in an opposite phase.
10 and 11, the T-branch circuit is assumed as the anti-phase two distribution circuit 4, but the in-phase distribution terminal is terminated with a waveguide terminator as in FIGS. A magic T circuit may be used.

  The four distributed radio waves are synthesized as right-handed circularly polarized radio waves in the OMT 2 a and output from the radiation antenna terminal 1. A horn antenna is connected to the radiation antenna terminal 1 to radiate radio waves. The OMT 2a is an example of the polarization demultiplexer 130. The polarization demultiplexer 130 is connected to the distributor 120 and is connected to the radiating antenna terminal 1, and synthesizes the radio waves distributed by the distributor 120. The demultiplexer 130 demultiplexes the radio wave input to the radiation antenna terminal 1 into four.

  The antenna power supply circuit 100a has reversibility, and when a right-handed circularly polarized radio wave is input from the radiating antenna terminal 1, the antenna feeding circuit 100a follows a path opposite to the above and outputs from the right-handed circularly polarized terminal 7a. Is done. In addition, the radio wave input from the left-handed circularly polarized wave terminal 8a passes through the same path as that input from the right-handed circularly polarized wave terminal 7a except that the phase relationship of the radio waves is different. Output as polarization. Similarly, when a left-hand circularly polarized radio wave is input from the radiating antenna terminal 1, it is output from the left-hand circularly polarized terminal 8a.

*** Explanation of effects of this embodiment ***
In a circularly polarized antenna feeding circuit, it is important to match the phase of each path to a desired value in order to realize low cross polarization. It is designed so that the phases are aligned when there is no dimensional processing error, but in general, the circuit dimensions change due to manufacturing errors, resulting in differences in the phase of the radio waves propagating in the antenna feed circuit, resulting in low cross polarization. The property cannot be realized. In particular, in the case of a high frequency, a phase difference with respect to a realizable processing error cannot be allowed. On the other hand, when the phase adjustment structure is provided, there is a problem that the circuit becomes large.

The radio wave input from the right-hand circularly polarized terminal 7a or the left-hand circularly polarized terminal 8a is distributed by the 90 ° two-distribution circuit 6, but there is an error in the path length to the two opposite-phase two-distribution circuits 4. If this occurs, the circularly polarized wave characteristic when the signal is distributed by the anti-phase two distribution circuit 4 and then combined by the OMT 2a is deteriorated.
Further, when an error occurs in the path from the anti-phase 2 distribution circuit 4 to the OMT 2a, a reflected wave is generated in the OMT 2a portion. However, when the magic T circuit is used as the anti-phase two distributor, it is terminated at the in-phase distribution terminal.
When a T-branch circuit is used as the anti-phase 2 distribution circuit, there is a possibility that a standing wave is generated between the anti-phase 2 distribution circuit 4 and the OMT 2a to deteriorate the circular polarization characteristic. Therefore, when a T-branch circuit is used as the anti-phase 2 distribution circuit 4, it is necessary to align the phases between the anti-phase 2 distribution circuit 4 and the OMT 2a.
As described above, phase adjustment between the anti-phase 2 distribution circuit 4 and the OMT 2a can be avoided by using a magic T circuit as the anti-phase 2 distribution circuit. However, since the phase difference in the path from the 90 degree two distribution circuit 6 to the opposite phase two distribution circuit 4 is finally cross-polarized unless corrected in that path, it is opposite to the 90 degree two distribution circuit 6. Phase adjustment between the phase 2 distribution circuits 4 is essential. The phase difference can be adjusted by the structure. However, if the phase is adjusted by a method other than changing the path length, the phase amount has frequency characteristics, so the cross-polarized wave is wideband. It is not possible.

Therefore, in the antenna power feeding circuit 100a according to the present embodiment, the phase adjustment circuit 5 is provided between the 90-degree 2-distribution circuit 6 and the anti-phase 2-distribution circuit 4 as in the first embodiment. The phase adjustment circuit 5 according to the present embodiment adjusts the phase by changing the path length in the bypass path of the waveguide.
As shown in FIG. 6, the E-plane bending phase adjustment circuit 5a guides the input / output terminals of the 90-degree 2-distribution circuit 6 and the anti-phase 2-distribution circuit 4 so that the wide wall surface of the waveguide can be bent. Adjust tube orientation and position. In the E-plane bending phase adjustment circuit 5a, the wide wall surface of the waveguide is bent in the E-plane. Compared with the case where the narrow wall surface of the waveguide shown in FIG.
Note that the phase adjustment circuit 5 may perform phase adjustment by replacing the entire detour for phase adjustment. Alternatively, the phase adjustment circuit 5 may be formed so that a part of the bypass waveguide can be divided. As shown in FIG. 8, a part of the detour may be divided and a part of the detour may be cut, or the phase may be adjusted using a small piece for adjustment such as a shim. The position of the dividing surface 12 to be divided may be arbitrarily changed.

Embodiment 3 FIG.
In the present embodiment, differences from Embodiments 1 and 2 will be mainly described.
In the present embodiment, the same components as those described in Embodiments 1 and 2 are denoted by the same reference numerals, and the description thereof may be omitted.

*** Explanation of configuration ***
FIG. 12 is a bird's-eye view of the antenna feeding circuit 100b according to the present embodiment.
FIG. 13 is a side view of FIG.
12 and FIG. 13 is different from FIG. 2 and FIG. 3 in the configuration of a 90 degree two distribution circuit. In the present embodiment, the 90-degree two-distribution circuit includes a twist waveguide 13 and a short slot coupler 6b. By arranging the twisted waveguide 13 between the short slot coupler 6b and the phase adjustment circuit 5, the direction of the waveguide terminal can be matched with the E-plane bending phase adjustment circuit. 12 is obtained by replacing the branch line coupler of FIG. 2 with a twist waveguide 13 and a short slot coupler 6b. The branch line coupler of the antenna feeding circuit of FIG. 4 or FIG. 10 is replaced with the twist guide of this embodiment. The wave tube 13 and the short slot coupler 6b may be replaced.

*** Explanation of effects of this embodiment ***
The short slot coupler has a wide distribution characteristic of amplitude and phase, and can realize a desired distribution characteristic of a phase difference of 90 degrees and the same amplitude over a wide frequency range. Therefore, according to the antenna feeder circuit 100b according to the present embodiment, low cross polarization characteristics can be realized over a wide frequency range.

Although Embodiments 1 to 3 have been described, a combination of a plurality of portions may be implemented among these embodiments. Alternatively, one part of these embodiments may be implemented. In addition, these embodiments may be implemented in any combination as a whole or in part.
The above-described embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, and uses, and various modifications can be made as necessary. .

  DESCRIPTION OF SYMBOLS 1 Radiation antenna terminal, 2OMJ, 2a OMT, 3 LPF, 4 reverse phase 2 distribution circuit, 4a Magic T circuit, 4b Waveguide terminator, 5 Phase adjustment circuit, 5a E surface bending phase adjustment circuit, 5b H surface bending Phase adjustment circuit, 6 90 degree 2 distribution circuit, 6b Short slot coupler, 7 Low-frequency right-hand circular polarization terminal, 7a Right-hand circular polarization terminal, 8 Low-frequency left-hand circular polarization terminal, 8a Left-hand circular polarization terminal, 9 circular polarization generator, 10 high-frequency right-hand circular polarization terminal, 11 high-frequency left-hand circular polarization terminal, 12 split plane, 13 twist waveguide, 100, 100a, 100b antenna feed circuit, 110 first circular polarization Wave terminal, 120 distributor, 130 polarization splitter, 140 second circularly polarized terminal.

Claims (9)

In an antenna feeding circuit comprising a radiating antenna terminal connected to an antenna and a first circularly polarized terminal for inputting and outputting radio waves,
A 90 degree two distribution circuit that is connected to the first circularly polarized wave terminal and distributes radio waves into two with a phase difference of 90 degrees;
A phase adjustment circuit connected to the 90 degree two distribution circuit and composed of a bypass waveguide;
A distributor that is connected to the phase adjustment circuit and further distributes each of the radio waves divided into two by the 90 degree two distribution circuit;
An antenna feeding circuit comprising: a demultiplexer that is connected to the distributor and is connected to the radiation antenna terminal, and synthesizes the radio waves distributed by the distributor.   The antenna feeding circuit according to claim 1, wherein the phase adjustment circuit comprises a bypass waveguide having an E-plane bent. In an antenna feeding circuit including a radiating antenna terminal connected to an antenna and a first circularly polarized wave terminal,
A demultiplexer connected to the radiating antenna terminal and demultiplexing the radio wave into four;
A distributor for synthesizing the radio wave divided into four by the polarization demultiplexer into two radio waves;
A phase adjusting circuit comprising a bypass waveguide connected to the distributor and having an E-plane bent;
An antenna feeding circuit including a 90 degree two distribution circuit that is arranged between the phase adjustment circuit and the first circularly polarized wave terminal and synthesizes two radio waves having a phase difference of 90 degrees. The antenna feeding circuit is
As the first circular polarization terminal, a right-hand circular polarization terminal and a left-hand circular polarization terminal,
The antenna feeding circuit according to any one of claims 1 to 3, wherein the demultiplexer is an OMT (Ortho-Mode Transducer). The antenna feeding circuit further includes:
A high-frequency right-handed circularly polarized wave terminal and a high-frequency left-handed circularly polarized wave terminal for inputting and outputting high-frequency radio waves higher than those inputted and outputted by the first circularly polarized wave terminal;
The polarization demultiplexer is an OMJ (Ortho-Mode Junction) that allows a radio wave of a high frequency to pass and synthesizes or demultiplexes a radio wave of a frequency lower than the high frequency.
The antenna feeding circuit further includes:
A low-pass filter disposed between the distributor and the OMJ;
2. A circularly polarized wave generator disposed between the second circularly polarized wave terminal including the high frequency clockwise circularly polarized wave terminal and the high frequency counterclockwise circularly polarized wave terminal and the OMJ. 4. The antenna feeding circuit according to any one of items 1 to 3. The phase adjustment circuit includes:
The antenna feeding circuit according to any one of claims 1 to 5, wherein a part of the bypass waveguide is formed to be separable.   The antenna feeding circuit according to claim 1, wherein the 90-degree two-distribution circuit is a branch line coupler.   The antenna feeding circuit according to claim 1, wherein the 90-degree two-distribution circuit includes a twist waveguide and a short slot coupler.   The antenna feeder circuit according to any one of claims 1 to 8, wherein the distributor is an anti-phase two distribution circuit that distributes radio waves into two in opposite phases, or combines two radio waves in opposite phases. .

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