阅读说明：本技术 一种非对称极小化Ka双圆极化频率双工器 (Asymmetric minimized Ka dual-circular polarization frequency duplexer ) 是由 成克伟 张龙 施锦文 万继响 薛兆璇 吕庆立 张乔杉 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种非对称极小化Ka双圆极化频率双工器,包括：镜像虚拟非对称耦合枢纽结构、下行滤波器Ⅰ/Ⅱ、H面立体折叠90°电桥、上行圆极化器、镜像结构Ⅰ/Ⅱ；镜像虚拟非对称耦合枢纽结构上设置有方口、矩口Ⅰ～Ⅳ；上行圆极化器通过方口与镜像虚拟非对称耦合枢纽结构连接；下行滤波器Ⅰ/Ⅱ分别通过矩口Ⅰ/Ⅱ与镜像虚拟非对称耦合枢纽结构连接；镜像结构Ⅰ/Ⅱ分别通过矩口Ⅲ/Ⅳ与镜像虚拟非对称耦合枢纽结构连接；H面立体折叠90°电桥分别与下行滤波器Ⅰ/Ⅱ连接。本发明用镜像虚拟非对称耦合枢纽结构和H面立体折叠90°电桥的设计,攻克了现有馈源由于其包络尺寸较大无法应用于1Tbps的超大容量卫星通信系统合成多波束馈源阵列中的问题。(The invention discloses an asymmetric minimized Ka dual-circular polarization frequency duplexer, which comprises: the system comprises a mirror image virtual asymmetric coupling pivot structure, a downlink filter I/II, an H-plane three-dimensional folding 90-degree electric bridge, an uplink circular polarizer and a mirror image structure I/II; a square port and a rectangular port I-IV are arranged on the mirror image virtual asymmetric coupling pivot structure; the uplink circular polarizer is connected with the mirror image virtual asymmetric coupling pivot structure through a square opening; the downlink filter I/II is connected with the mirror image virtual asymmetric coupling pivot structure through a rectangular port I/II respectively; the mirror image structure I/II is connected with the mirror image virtual asymmetric coupling pivot structure through a rectangular port III/IV respectively; the H-plane three-dimensional folding 90-degree electric bridge is respectively connected with the I/II downlink filter. The invention solves the problem that the existing feed source cannot be applied to the synthesis of a multi-beam feed source array in a 1Tbps ultra-large-capacity satellite communication system due to larger envelope size by using the design of a mirror image virtual asymmetric coupling pivot structure and an H-plane three-dimensional folding 90-degree electric bridge.)

1. An asymmetric miniaturised Ka dual circularly polarized frequency duplexer, comprising: the system comprises a mirror image virtual asymmetric coupling pivot structure (1), a downlink filter I (2), an H-plane three-dimensional folding 90-degree electric bridge (3), an uplink circular polarizer (4), a downlink filter II (5), a mirror image structure I (6) and a mirror image structure II (7); wherein, a square opening (102), a rectangular opening I (103), a rectangular opening II (104), a rectangular opening III (105) and a rectangular opening IV (106) are arranged on the mirror image virtual asymmetric coupling hub structure (1);

the uplink circular polarizer (4) is connected with the mirror image virtual asymmetric coupling pivot structure (1) through a square opening (102);

the downlink filter I (2) and the downlink filter II (5) are respectively connected with the mirror image virtual asymmetric coupling pivot structure (1) through a rectangular port I (103) and a rectangular port II (104);

the mirror image structure I (6) and the mirror image structure II (7) are respectively connected with the mirror image virtual asymmetric coupling hub structure (1) through a rectangular port III (105) and a rectangular port IV (106);

the H-plane three-dimensional folding 90-degree electric bridge (3) is respectively connected with the downlink filter I (2) and the downlink filter II (5).

2. The asymmetric minimized Ka dual circularly polarized frequency duplexer according to claim 1, wherein the mirror virtual asymmetric coupling hub structure (1) is further provided with a common circular port (101) and a square ridge waveguide (109);

the square opening (102) is positioned at the lower end of the mirror image virtual asymmetric coupling pivot structure (1);

the rectangular port I (103), the rectangular port II (104), the rectangular port III (105) and the rectangular port IV (106) are positioned on four side surfaces of the middle part of the mirror image virtual asymmetric coupling hinge structure (1); the rectangular opening I (103) is orthogonal to the rectangular opening II (104), and the rectangular opening III (105) is orthogonal to the rectangular opening IV (106);

the common circular port (101) is positioned at the upper end of the mirror image virtual asymmetric coupling pivot structure (1), and the common circular port (101) is used as a port for connecting the asymmetric minimized Ka dual-circular polarization frequency duplexer with other external equipment;

the square ridge waveguide (109) is located between the common circular port (101) and the square port (102) of the mirror image virtual asymmetric coupling hub structure (1).

3. The asymmetric minimized Ka dual circularly polarized frequency duplexer according to claim 2, wherein an output port A (303) and an output port B (304) are arranged on the H-plane stereoscopic folding 90 ° bridge (3); an input port A (202) is arranged on the downlink filter I (2), and an input port B (502) is arranged on the downlink filter II (5); the input port A (202) of the downlink filter I (2) is spatially cascaded with the output port A (303) of the H-face three-dimensional folding 90-degree electric bridge (3); an input port B (502) of the downlink filter II (5) is spatially cascaded with an output port B (304) of the H-plane stereoscopic folding 90-degree electric bridge (3).

4. The asymmetric minimized Ka dual-circularly-polarized frequency duplexer as claimed in claim 3, wherein the downlink filter I (2) is further provided with an output port C (201), and the downlink filter II (5) is further provided with an output port D (501); an output port C (201) of the downlink filter I (2) is connected with the rectangular port I (103), and an output port D (501) of the downlink filter II (5) is connected with the rectangular port II (104).

5. The asymmetric minimized Ka dual-circularly-polarized frequency duplexer according to claim 4, wherein the H-plane stereoscopic folding 90-degree bridge (3) is further provided with a downlink left-handed input port (301) and a downlink right-handed input port (302); the downlink left-handed input port (301) and the downlink right-handed input port (302) are used for transmitting downlink frequency band signals.

6. The asymmetric minimized Ka dual circular polarization frequency duplexer according to claim 5, wherein the uplink circular polarizer (4) is provided with: a public square port, a left-hand circular polarization rectangular port and a right-hand circular polarization rectangular port; the public square opening of the uplink circular polarizer (4) is connected with the square opening (102) of the mirror image virtual asymmetric coupling pivot structure (1); the left-hand circular polarization rectangular port and the right-hand circular polarization rectangular port are used for transmitting uplink frequency band signals.

7. The asymmetric miniaturized Ka dual circularly polarized frequency duplexer of claim 6,

when a downlink frequency band signal is input from a downlink left-handed input port (301), the downlink frequency band signal is input with half-power through the downlink left-handed input port (301), passes through an output port A (303) and a downlink filter I (2), outputs a linear polarization signal I, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure (1); a downlink frequency band signal is input into a half-power through a downlink left-handed input port (301), then passes through an output port B (304) and a downlink filter II (5), outputs a linear polarization signal II, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure (1); the phase difference between the linear polarization signal I and the linear polarization signal II is-90 degrees, and the linear polarization signal I and the linear polarization signal II are synthesized into a left-hand circularly polarized signal in a public inner cavity of the mirror image virtual asymmetric coupling hub structure (1);

when a downlink frequency band signal is input from a downlink right-handed input port (302), the downlink frequency band signal is input through the downlink right-handed input port (302), and then half power passes through an output port A (303) and a downlink filter I (2) to output a linear polarization signal III, and enters a common inner cavity of the mirror virtual asymmetric coupling hub structure (1); a downlink frequency band signal is input with half-half power through a downlink right-handed input port (302), passes through an output port B (304) and a downlink filter II (5), outputs a linear polarization signal IV and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure (1); the phase difference between the linear polarization signal III and the linear polarization signal IV is 90 degrees, and the linear polarization signal III and the linear polarization signal IV synthesize right-hand circularly polarized signals in a public cavity of the mirror image virtual asymmetric coupling hub structure (1); at the moment, the square ridge waveguide (109) inhibits the signals of the downlink frequency band from entering the uplink circular polarizer (4) and the inhibition reaches more than-100 dB.

8. The asymmetric miniaturized Ka dual circularly polarized frequency duplexer of claim 7, wherein the uplink band signals enter from the common circular port (101) and are output from the square port (102) to the uplink circular polarizer (4); at the moment, the downlink filter I (2) and the downlink filter II (5) restrain the uplink frequency band signals from entering the H-plane stereoscopic folding 90-degree electric bridge (3).

9. The asymmetric minimized Ka dual-circularly-polarized frequency duplexer as claimed in claim 1, wherein the downlink filter I (2) and the downlink filter II (5) have the same structure, are both branched low-pass filters, and comprise three complete branches;

the mirror image structure I (6) and the mirror image structure II (7) are identical in structure; the mirror image structure I (6) mirrors a first branch of the downlink filter I (2), namely the mirror image structure I (6) has the same structure as the first branch of the downlink filter I (2), one end of the mirror image structure I (6) is connected with the rectangular port III (105), and the other end of the mirror image structure I (6) is short-circuited; the mirror image structure II (7) mirrors the first branch of the downlink filter II (5), namely the mirror image structure II (7) has the same structure as the first branch of the downlink filter II (5), one end of the mirror image structure II (7) is connected with the rectangular port IV (106), and the other end of the mirror image structure II (7) is short-circuited.

10. The asymmetric miniaturized Ka dual circularly polarized frequency duplexer of claim 1,

the H-plane three-dimensional folding 90-degree electric bridge (3) is a spatial structure electric bridge and is in a three-dimensional 90-degree orthogonal structure;

the asymmetric minimized Ka dual-circularly-polarized frequency duplexer has the following size parameters: transverse direction multiplied by longitudinal direction multiplied by 30mm multiplied by 60 mm; the weight is less than or equal to 70 g.

Technical Field

The invention belongs to the technical field of satellite-borne synthesis multi-beam antennas, and particularly relates to an asymmetric minimized Ka dual-circular polarization frequency duplexer.

Background

The system comprises a space-ground integrated system communication system, a ground system architecture design supporting massive terminals, a space-ground integrated beam hopping technology, broadband flexible load on-satellite digital transparent processing, an extremely narrow beam high-gain low-sidelobe multi-beam antenna and the like, and is an ultra-large capacity communication satellite system based on 1 Tbps.

To develop a very large capacity communication satellite system, the development of a synthetic multi-beam antenna with proprietary intellectual property rights is an urgent problem to be solved by those skilled in the antenna art.

Disclosure of Invention

The technical problem of the invention is solved: the asymmetric minimized Ka dual-circular polarization frequency duplexer overcomes the defects of the prior art, adopts a mirror image virtual asymmetric coupling pivot structure and an H-plane three-dimensional folding 90-degree electric bridge design, and solves the problem that the existing feed source cannot be applied to synthesizing a multi-beam feed source array in a 1Tbps ultra-large capacity satellite communication system due to large envelope size.

In order to solve the technical problem, the invention discloses an asymmetric minimized Ka dual circularly polarized frequency duplexer, which comprises: the system comprises a mirror image virtual asymmetric coupling pivot structure, a downlink filter I, an H-plane three-dimensional folding 90-degree electric bridge, an uplink circular polarizer, a downlink filter II, a mirror image structure I and a mirror image structure II; the mirror image virtual asymmetric coupling hub structure is provided with a square opening, a rectangular opening I, a rectangular opening II, a rectangular opening III and a rectangular opening IV;

the uplink circular polarizer is connected with the mirror image virtual asymmetric coupling pivot structure through a square opening;

the downlink filter I and the downlink filter II are respectively connected with the mirror image virtual asymmetric coupling pivot structure through a rectangular port I and a rectangular port II;

the mirror structure I and the mirror structure II are respectively connected with the mirror virtual asymmetric coupling pivot structure through a rectangular port III and a rectangular port IV;

and the H-plane three-dimensional folding 90-degree electric bridge is respectively connected with the downlink filter I and the downlink filter II.

In the asymmetric minimized Ka dual-circularly polarized frequency duplexer, a mirror virtual asymmetric coupling pivot structure is further provided with a common circular port and a square ridge waveguide;

the square opening is positioned at the lower end of the mirror image virtual asymmetric coupling pivot structure;

the rectangular port I, the rectangular port II, the rectangular port III and the rectangular port IV are positioned on four side surfaces in the middle of the mirror image virtual asymmetric coupling hub structure; the rectangular port I and the rectangular port II are arranged orthogonally, and the rectangular port III and the rectangular port IV are arranged orthogonally;

the common circular port is positioned at the upper end of the mirror image virtual asymmetric coupling pivot structure and is used as a port for connecting the asymmetric minimized Ka dual-circular polarization frequency duplexer with other external equipment;

the square ridge waveguide is positioned between the common round port and the square port of the mirror image virtual asymmetric coupling hub structure.

In the asymmetric minimized Ka dual-circular polarization frequency duplexer, an output port A and an output port B are arranged on an H-plane three-dimensional folding 90-degree electric bridge; an input port A is arranged on the downlink filter I, and an input port B is arranged on the downlink filter II; the input port A of the downlink filter I is spatially cascaded with the output port A of the H-face three-dimensional folding 90-degree electric bridge; and an input port B of the downlink filter II is spatially cascaded with an output port B of the H-plane three-dimensional folding 90-degree electric bridge.

In the asymmetric minimized Ka dual-circularly-polarized frequency duplexer, an output port C is also arranged on the downlink filter I, and an output port D is also arranged on the downlink filter II; the output port C of the downlink filter I is connected with the rectangular port I, and the output port D of the downlink filter II is connected with the rectangular port II.

In the asymmetric minimized Ka dual-circularly polarized frequency duplexer, a downlink left-handed input port and a downlink right-handed input port are also arranged on the H-face three-dimensional folded 90-degree electric bridge; the downlink left-handed input port and the downlink right-handed input port are used for transmitting downlink frequency band signals.

In the above asymmetric minimization Ka dual circular polarization frequency duplexer, the uplink circular polarizer is provided with: a public square port, a left-hand circular polarization rectangular port and a right-hand circular polarization rectangular port; the public square port of the uplink circular polarizer is connected with the square port of the mirror image virtual asymmetric coupling pivot structure; the left-hand circular polarization rectangular port and the right-hand circular polarization rectangular port are used for transmitting uplink frequency band signals.

In the above asymmetric minimized Ka dual circular polarization frequency duplexer,

when a downlink frequency band signal is input from a downlink left-handed input port, the downlink frequency band signal is input through the downlink left-handed input port, and then half power passes through an output port A and a downlink filter I to output a linear polarization signal I and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure; the downlink frequency band signal is input with half-power through a downlink left-handed input port, passes through an output port B and a downlink filter II, then is output with a linear polarization signal II, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure; the phase difference between the linear polarization signal I and the linear polarization signal II is-90 degrees, and the linear polarization signal I and the linear polarization signal II are synthesized into a left-hand circularly polarized signal in a common inner cavity of the mirror image virtual asymmetric coupling hub structure;

when a downlink frequency band signal is input from a downlink right-handed input port, the downlink frequency band signal is input with half-power through the downlink right-handed input port, passes through an output port A and a downlink filter I, outputs a linear polarization signal III, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure; the downlink frequency band signal is input with half-power through a downlink right-handed input port, passes through an output port B and a downlink filter II, then is output with a linear polarization signal IV, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure; the phase difference between the linear polarization signal III and the linear polarization signal IV is 90 degrees, and the linear polarization signal III and the linear polarization signal IV are synthesized into a right-hand circularly polarized signal in a common inner cavity of the mirror image virtual asymmetric coupling hub structure; at the moment, the square ridge waveguide inhibits the downlink frequency band signals from entering the uplink circular polarizer, and the inhibition reaches more than-100 dB.

In the asymmetric minimized Ka dual-circular polarization frequency duplexer, an uplink frequency band signal enters from a common circular port and is output to an uplink circular polarizer from a square port; at the moment, the downlink filter I and the downlink filter II restrain the uplink frequency band signals from entering the H-plane three-dimensional folding 90-degree electric bridge.

In the asymmetric minimized Ka dual-circular polarization frequency duplexer, the downlink filter I and the downlink filter II have the same structure, are both branch-node type low-pass filters and comprise three complete branch nodes;

the mirror image structure I and the mirror image structure II have the same structure; the mirror structure I mirrors a first branch of the downlink filter I, namely the mirror structure I and the first branch of the downlink filter I are the same in structure, one end of the mirror structure I is connected with the rectangular port III, and the other end of the mirror structure I is short-circuited; the mirror structure II mirrors the first branch of the downlink filter II, namely the mirror structure II is the same as the first branch of the downlink filter II in structure, one end of the mirror structure II is connected with the rectangular opening IV, and the other end of the mirror structure II is short-circuited.

In the above asymmetric minimized Ka dual circular polarization frequency duplexer,

the H-plane three-dimensional folding 90-degree electric bridge is a spatial structure electric bridge and is in a three-dimensional 90-degree orthogonal structure;

the asymmetric minimized Ka dual-circularly-polarized frequency duplexer has the following size parameters: transverse direction multiplied by longitudinal direction multiplied by 30mm multiplied by 60 mm; the weight is less than or equal to 70 g.

The invention has the following advantages:

(1) the invention relates to an asymmetric minimized Ka dual-circular polarization frequency duplexer, which adopts a mirror image virtual asymmetric coupling pivot structure and an H-plane three-dimensional folding 90-degree electric bridge design and can be applied to a 1Tbps ultra-large-capacity satellite communication system to synthesize a multi-beam feed source array.

(2) The invention relates to an asymmetric minimized Ka dual-circular polarization frequency duplexer, which adopts a mirror image virtual asymmetric coupling pivot structure and an H-plane three-dimensional folding 90-degree electric bridge, so that the envelope size of the structure reaches 30mm multiplied by 60mm in the transverse direction multiplied by the longitudinal direction, the weight is light (the weight is less than or equal to 70g), and compared with the traditional feed source related products, the envelope size of the product is smaller, and the weight is lighter.

(3) The asymmetric minimized Ka dual-circular polarization frequency duplexer is suitable for synthesizing a multi-beam feed source array in 1Tbps ultra-large-capacity satellite communication and is also suitable for a Ka mechanical movable spot beam antenna, and has smaller electric field shielding and scattering effects.

(4) The asymmetric minimized Ka dual-circular polarization frequency duplexer is designed by adopting a mirror image virtual asymmetric coupling pivot structure, proves the effectiveness and correctness of the asymmetric structure in inhibiting high order modes and reducing the envelope size of products, and plays a guiding role in designing other microwave passive related products.

Drawings

Fig. 1 is an electrical schematic diagram of an asymmetric minimized Ka dual circularly polarized frequency duplexer according to an embodiment of the present invention;

FIG. 2 is a schematic electrical diagram of a mirror-image virtual asymmetric coupling hub structure according to an embodiment of the present invention;

FIG. 3 is a top view of an asymmetric miniaturized Ka dual circularly polarized frequency duplexer in an embodiment of the present invention;

fig. 4 is an electrical schematic diagram of an H-plane three-dimensional folded 90 ° electrical bridge according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in this embodiment, the asymmetric miniaturized Ka dual circular polarization frequency duplexer includes: the device comprises a mirror image virtual asymmetric coupling pivot structure 1, a downlink filter I2, an H-plane three-dimensional folding 90-degree electric bridge 3, an uplink circular polarizer 4, a downlink filter II 5, a mirror image structure I6 and a mirror image structure II 7.

As shown in fig. 2 and 3, the mirror-image virtual asymmetric coupling hub structure 1 is provided with a square port 102, a rectangular port i 103, a rectangular port ii 104, a rectangular port iii 105, a rectangular port iv 106, a common round port 101 and a square ridge waveguide 109. Wherein, the square opening 102 is located at the lower end of the mirror image virtual asymmetric coupling hinge structure 1; the rectangular port I103, the rectangular port II 104, the rectangular port III 105 and the rectangular port IV 106 are positioned on four side surfaces of the middle part of the mirror image virtual asymmetric coupling hinge structure 1, the rectangular port I103 is orthogonal to the rectangular port II 104, and the rectangular port III 105 is orthogonal to the rectangular port IV 106; the square-ridge waveguide 109 is located between the public circular port 101 and the square port 102 of the mirror-image virtual asymmetric coupling hub structure 1; the common circular port 101 is located at the upper end of the mirror virtual asymmetric coupling hub structure 1, and the common circular port 101 is used as a port for connecting the asymmetric minimized Ka dual-circularly polarized frequency duplexer with other external devices. It should be noted that the other external devices are generally circular port devices, such as a radiation unit or a speaker

In this embodiment, the uplink circular polarizer 4 is connected to the mirror-image virtual asymmetric coupling hub structure 1 through the square opening 102; the downlink filter I2 and the downlink filter II 5 are respectively connected with the mirror image virtual asymmetric coupling pivot structure 1 through a rectangular port I103 and a rectangular port II 104; the mirror image structure I6 and the mirror image structure II 7 are respectively connected with the mirror image virtual asymmetric coupling hub structure 1 through a rectangular port III 105 and a rectangular port IV 106; the H-face three-dimensional folding 90-degree electric bridge 3 is respectively connected with the downlink filter I2 and the downlink filter II 5.

In this embodiment, the H-plane solid-folded 90 ° bridge 3 is a spatial structure bridge and has a solid 90 ° orthogonal structure, and as shown in fig. 4, the H-plane solid-folded 90 ° bridge 3 is provided with an output port a303 and an output port B304. As shown in fig. 3, the downstream filter i 2 is provided with an input port a202, and the downstream filter ii 5 is provided with an input port B502. The input port A202 of the downlink filter I2 is spatially cascaded with the output port A303 of the H-face three-dimensional folding 90-degree electric bridge 3; an input port B502 of the downlink filter II 5 is spatially cascaded with an output port B304 of the H-plane stereoscopic folding 90-degree electric bridge 3.

In this embodiment, as shown in fig. 3, the downstream filter i 2 is further provided with an output port C201, and the downstream filter ii 5 is further provided with an output port D501. An output port C201 of the downlink filter I2 is connected with the rectangular port I103, and an output port D501 of the downlink filter II 5 is connected with the rectangular port II 104.

In this embodiment, as shown in fig. 4, the H-plane stereoscopic folding 90 ° electrical bridge 3 is further provided with a downlink left-handed input port 301 and a downlink right-handed input port 302; the downlink left-handed input port 301 and the downlink right-handed input port 302 are used for transmitting downlink frequency band signals.

In this embodiment, the uplink circular polarizer 4 is provided with: the square port comprises a public square port, a left-hand circular polarization rectangular port and a right-hand circular polarization rectangular port. Wherein, the public square mouth of the uplink circular polarizer 4 is connected with the square mouth 102 of the mirror image virtual asymmetric coupling pivot structure 1; the left-hand circular polarization rectangular port and the right-hand circular polarization rectangular port are used for transmitting uplink frequency band signals.

In this embodiment, the downlink filter i 2 and the downlink filter ii 5 have the same structure, and are both branch-node type low-pass filters, including three complete branches. Mirror image structure I6 is the same as mirror image structure II 7: the mirror structure I6 mirrors a first branch of the downlink filter I2, namely the mirror structure I6 has the same structure as the first branch of the downlink filter I2, one end of the mirror structure I6 is connected with the rectangular port III 105, and the other end of the mirror structure I6 is short-circuited; mirror image structure II 7 mirrors the first branch of downlink filter II 5, i.e. mirror image structure II 7 is the same as the first branch of downlink filter II 5, and one end of mirror image structure II 7 is connected with rectangular port IV 106, and the other end is short-circuited.

In this embodiment, the size parameters of the finally obtained asymmetric minimized Ka dual circularly polarized frequency duplexer product are as follows: transverse direction multiplied by longitudinal direction multiplied by 30mm multiplied by 60 mm; the weight is less than or equal to 70 g. The working principle of the asymmetric minimized Ka dual-circular polarization frequency duplexer is as follows:

for downlink frequency band signals: when a downlink frequency band signal is input from the downlink left-handed input port 301, the downlink frequency band signal is input through the downlink left-handed input port 301, and then half power passes through the output port A303 and the downlink filter I2 to output a linear polarization signal I, and enters a common inner cavity of the mirror image virtual asymmetric coupling hinge structure 1; the downlink frequency band signal is input with half-half power through a downlink left-handed input port 301, passes through an output port B304 and a downlink filter II 5, then is output with a linear polarization signal II, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure 1; the phase difference between the linear polarization signal I and the linear polarization signal II is-90 degrees, and the linear polarization signal I and the linear polarization signal II are synthesized into a left-hand circularly polarized signal in a public cavity of the mirror image virtual asymmetric coupling hub structure 1. When a downlink frequency band signal is input from the downlink right-handed input port 302, the downlink frequency band signal is input through the downlink right-handed input port 302, and then the half-power passes through the output port A303 and the downlink filter I2 to output a linear polarization signal III, and enters a common inner cavity of the mirror image virtual asymmetric coupling hinge structure 1; the downlink frequency band signal is input with half-half power through a downlink right-handed input port 302, passes through an output port B304 and a downlink filter II 5, then is output with a linear polarization signal IV, and enters a common inner cavity of the mirror image virtual asymmetric coupling pivot structure 1; the phase difference between the linear polarization signal III and the linear polarization signal IV is 90 degrees, and the linear polarization signal III and the linear polarization signal IV synthesize a right-hand circularly polarized signal in a public cavity of the mirror image virtual asymmetric coupling hub structure 1. At this time, the square ridge waveguide 109 suppresses the downlink frequency band signal from entering the uplink circular polarizer 4 by more than-100 dB.

For uplink band signals: the uplink frequency band signal enters from a public circular port 101 and is output to the uplink circular polarizer 4 from a square port 102; at this time, the downlink filter I2 and the downlink filter II 5 restrain the uplink frequency band signals from entering the H-plane stereo folding 90-degree electric bridge 3.

In conclusion, the research of the synthetic multi-beam antenna with independent intellectual property rights is a problem which needs to be solved urgently by technical personnel in the antenna field, the minimization of the Ka dual circularly polarized frequency duplexer is used as a core component of an antenna synthetic feed source array, the design requirement is strict, the envelope size of the antenna dual circularly polarized frequency duplexer is reduced by more than 50 percent compared with the traditional product, and the weight is reduced by more than 60 percent, the invention utilizes a mirror image virtual asymmetric coupling pivot structure and a design method of an H-plane three-dimensional folding 90-degree electric bridge to obtain the asymmetric minimization of the Ka dual circularly polarized frequency duplexer, the envelope size of the asymmetric minimization of the Ka dual circularly polarized frequency duplexer reaches 30mm multiplied by 60mm in the transverse direction, the weight is less than or equal to 70g, compared with related products of the traditional feed source, the envelope size of the product of the invention is smaller, the weight is lighter, and the problem that the envelope size of the traditional feed source can not be applied to the synthetic multi-beam feed source array of a super-capacity satellite communication system with 1Tbps is solved, the design is pioneering at home and abroad.

The traditional Ka dual-circular polarization frequency duplexer generally comprises a four-arm symmetric coupling hub structure and an uplink and downlink clapboard circular polarizer, and compact similar products of Telles corporation comprise a four-port asymmetric H-plane coupling hub, an E-plane multi-branch coupling bridge and an uplink circular polarizer. Compared with the traditional Ka dual-circularly-polarized frequency duplexer or a compact similar product of Less company, the asymmetric minimized Ka dual-circularly-polarized frequency duplexer has the advantages of small envelope size and light weight.

Furthermore, the traditional four-arm coupling pivot mainly depends on the phase superposition relationship of a symmetrical structure in a coupling window to inhibit high-order modes, and in order to reduce the transverse envelope, the invention adopts a mirror image virtual asymmetric coupling pivot structure. The linearly polarized guided wave has no superposition relationship at the coupling window, so that the suppression of the higher-order mode cannot be eliminated by adopting phase reversal superposition. The mirror image structure I and the mirror image structure II are innovatively introduced into the mirror image virtual asymmetric coupling pivot structure, the virtual symmetry of the mirror image virtual asymmetric coupling pivot structure is kept, and the transverse envelope is reduced. The mirror structure I and the mirror structure II have the functions that the guided wave forms a reflected guided wave after passing through the mirror structure I and the mirror structure II, and the main mode TE of the reflected wave and the coupled wave₁₁The modes add in phase within a common cavity mirroring the virtual asymmetric coupling hinge structure and the TM01 mode cancels out in anti-phase. The introduction of the mirror image structure I and the mirror image structure II is crucial: the envelope size of the asymmetric minimized Ka dual-circular polarization frequency duplexer is reduced; the suppression degree of a higher-order mode is improved; the working bandwidth of the asymmetric minimized Ka dual-circularly-polarized frequency duplexer is widened.

In addition, the traditional H-face 90-degree electric bridge is of a plane structure, and the plane structure is folded into a 90-degree three-dimensional structure, so that the H-face three-dimensional folded 90-degree electric bridge of the space structure electric bridge is obtained. Due to the requirement of envelope miniaturization, after the mirror image virtual asymmetric coupling pivot structure is cascaded with two downlink filters, two downlink ports form a 90-degree orthogonal structure in terms of a space structure, the ports of an H-face 90-degree bridge of a traditional plane structure cannot be cascaded with the ports, and the problem can be solved by adopting an H-face three-dimensional folding 90-degree bridge of the space structure bridge.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above, and therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protection scope of the present invention.

Those skilled in the art will appreciate that the invention may be practiced without these specific details.