A dual-frequency dual-polarization splitter

Abstract

The present invention discloses a dual-frequency dual-polarization splitter, which uses a cross-shaped waveguide power divider to cleverly connect with an E-plane waveguide magic T and an orthogonal mode coupler through an E / H-plane 90° curved waveguide, forming a new coaxial waveguide orthogonal mode coupler, realizing a structure of simultaneous high- and low-frequency feeding of a coaxial circular waveguide, reducing the length of a high-frequency transmission line, and reducing transmission loss. At the same time, dual-polarization transmission is realized in each frequency band, and when dual-polarization is converted to single polarization, it can flexibly switch between vertical polarization and horizontal polarization.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a dual-frequency dual-polarization splitter. Background Art

[0002] Sharing of transmission and reception has been widely used in the fields of navigation, measurement and control, satellite communications, etc., and with the increase of satellite spectrum resources, dual-frequency sharing or multi-frequency sharing antennas can enable one antenna to be used in two or even more frequency bands with only a small increase in cost. Especially when the antenna aperture is large, this method can significantly reduce the cost of the antenna system, while reducing the land use area and facilitating the layout of user sites.

[0003] In addition, with the increasing maturity of electromagnetic simulation software and the development of coaxial turnstile coupler technology, the available bandwidth of the coupled waveguide port of the coaxial turnstile coupler is getting wider and wider, which can already meet the bandwidth requirements for dual-band use. In addition, since the coaxial inner conductor of the coaxial turnstile coupler is hollow, a circular waveguide can be formed to transmit higher frequency band signals, and the structure is simple and does not require debugging.

[0004] In the patent document with application number: CN201711361522.4, a truncated cone-matched coaxial waveguide orthogonal mode coupler is disclosed, such as Figure 1 As shown, it includes a coaxial turnstile connector 1, a U-shaped bend waveguide element 1 2, a U-shaped bend waveguide element 2 3, a U-shaped bend waveguide element 3 4, a U-shaped bend waveguide element 4 5, a power combiner / distributor 1 6 and a power combiner / distributor 2 7. This solution has excellent electrical performance and is simple to process. It can achieve equal-phase polarization separation within nearly one frequency doubling, and has excellent indicators such as standing wave, isolation, and insertion loss.

[0005] However, in the above-mentioned document, due to the cavity cross design, the structural layout is not convenient for product implementation. For example, the high-frequency signal in the coaxial turnstile joint 1 is blocked by the waveguide cavity surrounded by four U-shaped bend waveguide elements and cannot be transmitted; it is also not convenient for product component processing. The crossing of the waveguide cavity in the document is not easy to achieve during the component processing process; in addition, the electrical function is not flexible enough and cannot achieve single and double flexible switching. For example, both the power combiner / distributor 6 and the power combiner / distributor 7 output a fixed single polarization mode. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a dual-frequency dual-polarization splitter.

[0007] To achieve the above object, the present invention proposes the following technical solution: a dual-frequency dual-polarization splitter, comprising a coaxial circular waveguide, a cross-shaped waveguide power divider, a first waveguide magic T, a second waveguide magic T and an orthogonal mode converter,

[0008] The coaxial circular waveguide is located on the central axis of the cross-shaped waveguide power divider and is perpendicular to the top surface of the cross-shaped waveguide power divider. The coaxial circular waveguide includes an outer circular waveguide and an inner circular waveguide located inside the outer circular waveguide.

[0009] A cross waveguide cavity is formed in the cross waveguide power divider, the cross waveguide cavity is communicated with the outer circular waveguide, and the inner circular waveguide runs through the cross waveguide power divider for transmitting high-frequency signals;

[0010] The cross-shaped waveguide power divider has four signal channels connected to the cross-waveguide cavity, and the four signal channels are cross-distributed, wherein two signal channels located in a first direction are respectively connected to two input ports of the first waveguide magic T, and the other two signal channels located in a second direction perpendicular to the first direction are respectively connected to two input ports of the second waveguide magic T;

[0011] The output port of the first waveguide magic T and the output port of the second waveguide magic T are both connected to the input port of the orthogonal mode converter;

[0012] The output end of the orthogonal mode converter forms a circular waveguide interface.

[0013] Preferably, the first waveguide magic T is a first E-plane waveguide magic T, and the second waveguide magic T is a second E-plane waveguide magic T; or the first waveguide magic T is a first H-plane waveguide magic T, and the second waveguide magic T is a second H-plane waveguide magic T.

[0014] Preferably, a polarization converter is arranged between the second E-plane waveguide magic T and the orthogonal mode converter.

[0015] Preferably, the first waveguide magic T and the second waveguide magic T are located on the same plane and do not intersect.

[0016] Preferably, the splitter further comprises a plurality of 90° bend waveguides, and the signal channel of the cross-shaped waveguide power splitter is connected to the input port of the corresponding waveguide magic T through the 90° bend waveguides.

[0017] Preferably, the 90° bend waveguide includes an E-plane 90° waveguide and an H-plane 90° bend waveguide, one end of the E-plane 90° waveguide is connected to the signal channel of the cross-shaped waveguide power divider, and the other end is connected to one end of the H-plane 90° bend waveguide, and the other end of the H-plane 90° bend waveguide is connected to the input port of the waveguide magic T.

[0018] Preferably, the dual-frequency dual-polarization splitter further comprises a circular waveguide, and the circular waveguide is connected to a circular waveguide interface.

[0019] Preferably, the outer circular waveguide transmits only TEM mode and TE11 mode and suppresses other high-order modes.

[0020] The present invention also discloses another technical solution: a dual-frequency dual-polarization splitter, comprising an upper structure, a lower structure, a middle structure between the upper structure and the lower structure, and a cylindrical tube penetrating the upper, middle and lower structures.

[0021] The upper structure comprises an upper end face and a lower end face opposite to each other, a cross waveguide cavity is formed on the lower end face, a circular hole penetrating the upper and lower end faces of the upper structure is arranged at the center of the cross waveguide cavity, and the cylindrical tube passes through the circular hole;

[0022] The middle layer structure is provided with four through holes corresponding to the cross waveguide cavity and distributed in a cross shape, the four ends of the cross waveguide cavity are connected with the corresponding through holes, and the through holes penetrate the middle layer structure;

[0023] A first waveguide magic T, a second waveguide magic T, and an orthogonal mode converter are formed on the lower end surface of the middle structure and between the upper end surface of the lower structure, wherein the two input ports of the first waveguide magic T are respectively connected to two through holes on the middle structure located in a first direction, and the two input ports of the second waveguide magic T are respectively connected to the other two through holes on the middle structure located in a second direction perpendicular to the first direction;

[0024] The output port of the first waveguide magic T and the output port of the second waveguide magic T are both connected to the input port of the orthogonal mode converter;

[0025] The output end of the orthogonal mode converter forms a circular waveguide interface.

[0026] Preferably, a first step corresponding to the cross waveguide cavity is further provided on the upper end surface of the middle layer structure, the first step is distributed in a cross shape, and the first step is connected to the outer wall of the cylindrical tube.

[0027] Preferably, a second step is provided at each end of the cross waveguide cavity corresponding to the four through holes.

[0028] Preferably, the number of the second steps is 2 to 4.

[0029] Preferably, a polarization converter is also formed between the lower end surface of the middle structure and the upper end surface of the lower structure, and the polarization converter is arranged between the second waveguide magic T and the orthogonal mode converter.

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention uses a cross-shaped power divider to cleverly connect the E-plane waveguide magic T and the orthogonal mode coupler through the E / H-plane 90° curved waveguide, forming a new type of coaxial waveguide orthogonal mode coupler, realizing the structure of coaxial circular waveguide high and low frequency (i.e. dual frequency) simultaneous feeding, reducing the length of the high-frequency transmission line and reducing the transmission loss. At the same time, dual-polarization transmission is realized in each frequency band, and when the dual polarization is converted to single polarization, it can flexibly switch between vertical polarization and horizontal polarization.

[0032] 2. The cross-shaped power divider of the present invention adopts a step structure, which can effectively improve the working bandwidth, power division flatness, and isolation of each port.

[0033] 3. The present invention has a simple and compact structure, which is convenient for miniaturization and batch production of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of an existing coaxial waveguide orthogonal mode coupler;

[0035] Figure 2 is a schematic diagram of the three-dimensional structure of a preferred embodiment of the present invention;

[0036] Figure 3 , Figure 4 They are Figure 2 Schematic diagram of the three-dimensional structure from two other perspectives;

[0037] Figure 5 It is a schematic diagram of the split structure of the product of the present invention;

[0038] Figure 6 The present invention Figure 5 Schematic diagram of the split structure from another perspective;

[0039] Figure 7 It is a schematic diagram of the structure of the product of the present invention after assembly.

[0040] Reference numerals:

[0041] 10. Coaxial circular waveguide, 11. Outer circular waveguide, 12. Inner circular waveguide, 20. Cross-shaped waveguide power divider, 21. Cross waveguide cavity, 22. Front signal channel, 23. Rear signal channel, 24. Left signal channel, 25. Right signal channel, 26. First step, 30. First E-plane waveguide magic T, 31. Input port, 32. Output port, 40. Second E-plane waveguide magic T, 41. Input port, 42. Output port, 50. Orthogonal mode converter, 51 / 52. Rectangular waveguide port, 53. Circular waveguide interface, 60. Polarization converter, 70. Circular waveguide, 80, E-plane 90° waveguide, 90, H-plane 90° curved waveguide, 100, upper structure, 101, first upper end face, 102, first lower end face, 103, circular hole, 104, second step, 200, middle structure, 201, second upper end face, 202, second lower end face, 203, cylindrical tube, 204, through hole, 205, first low-frequency waveguide cavity, 206, second low-frequency waveguide cavity, 207, orthogonal mode conversion cavity, 208, polarization conversion cavity, 209, circular waveguide half hole, 300, lower structure, 301, third upper end face. DETAILED DESCRIPTION

[0042] The technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0043] Combination Figure 2 to Figure 7 As shown, a dual-frequency dual-polarization splitter disclosed in the best embodiment of the present invention includes a coaxial circular waveguide 10, a cross-shaped waveguide power divider 20, a first E-plane waveguide magic T30, a second E-plane waveguide magic T40, an orthogonal mode converter 50, a polarization converter 60 and a circular waveguide 70, wherein the coaxial circular waveguide 10 is located on the central axis of the cross-shaped waveguide power divider 20, that is, coaxial with the cross-shaped waveguide power divider 20, and perpendicular to the top surface of the cross-shaped waveguide power divider 20.

[0044] The coaxial circular waveguide 10 includes an outer circular waveguide 11 and an inner circular waveguide 12 arranged on the same axis, the inner circular waveguide 12 is located inside the outer circular waveguide 11, and penetrates the top and bottom surfaces of the cross-shaped waveguide power divider 20, that is, the lower end of the inner circular waveguide 12 passes through the bottom surface of the cross-shaped waveguide power divider 20, one end (such as the bottom end) of the inner circular waveguide 12 is connected to a high-frequency transmitter (not shown), and the other end (such as the top end) is connected to an antenna reflection surface (not shown) for transmitting high-frequency band signals to the antenna reflection surface. The size ratio of the inner diameter of the outer circular waveguide 11 to the outer diameter of the inner circular waveguide 12 satisfies the requirement of transmitting only TEM mode and TE11 mode and suppressing other high-order modes.

[0045] A cross waveguide cavity 21 is formed in the cross waveguide power divider 20, and the outer circular waveguide 11 of the coaxial circular waveguide is connected to the cross waveguide cavity 21. The cross waveguide power divider 20 has four signal channels that are cross-distributed, and the four signal channels are respectively extended from the outer edge of the cross waveguide cavity 21 in four directions, namely, forward, backward, left, and right, and all the four signal channels are connected to the cross waveguide cavity 21. For the convenience of description, the four signal channels are defined as a front signal channel 22, a rear signal channel 23, a left signal channel 24, and a right signal channel 25, wherein the front signal channel 22 and the rear signal channel 23 are located in the same direction (defined as a first direction), and the left signal channel 24 and the right signal channel 25 are located in the same direction (defined as a second direction perpendicular to the first direction).

[0046] The front signal channel 22 and the rear signal channel 23 are respectively connected to the two input ports 31 of the first E-plane waveguide magic T30, and the output port 32 of the first E-plane waveguide magic T30 is connected to one of the rectangular waveguide ports 51 of the orthogonal mode converter 50, so as to merge the front and rear signal channels 22 and 23 into one channel.

[0047] The left signal channel 24 and the right signal channel 25 are respectively connected to the two input ports 41 of the second E-plane waveguide magic T40, and the output port 42 of the second E-plane waveguide magic T40 is connected to another rectangular waveguide port 52 of the orthogonal mode converter 50, so as to merge the left and right signal channels 24 and 25 into one channel. Preferably, the first E-plane waveguide magic T30 and the second E-plane waveguide magic T40 are located on the same plane and do not intersect.

[0048] During implementation, the front signal channel 22 and the rear signal channel 23 are connected to the two input ports 31 of the first E-plane waveguide magic T30, and the left signal channel 24 and the right signal channel 25 are connected to the two input ports 41 of the second E-plane waveguide magic T40 through a 90° bend waveguide. In this embodiment 1, the four signal channels and the input ports of the corresponding E-plane waveguide magic T are connected through an E-plane 90° waveguide 80 combined with an H-plane 90° bend waveguide 90. Specifically, the front signal channel 22 is connected to one end of the E-plane 90° waveguide 80, the other end of the E-plane 90° waveguide 80 is connected to one end of the H-plane 90° bend waveguide 90, and the other end of the H-plane 90° bend waveguide 90 is connected to the input port 31 of the first E-plane waveguide magic T30. The rear signal channel 23 is connected to one end of the E-plane 90° waveguide, the other end of the E-plane 90° waveguide 80 is connected to one end of the H-plane 90° curved waveguide 90, and the other end of the H-plane 90° curved waveguide 90 is connected to another input port 31 of the first E-plane waveguide magic T 30.

[0049] Similarly, the left signal channel 24 is connected to one end of the E-plane 90° waveguide 80, the other end of the E-plane 90° waveguide 80 is connected to one end of the H-plane 90° curved waveguide 90, and the other end of the H-plane 90° curved waveguide 90 is connected to the input port 41 of the second E-plane waveguide magic T40. The right signal channel 25 is connected to one end of the E-plane 90° waveguide 80, the other end of the E-plane 90° waveguide 80 is connected to one end of the H-plane 90° curved waveguide 90, and the other end of the H-plane 90° curved waveguide 90 is connected to the other input port 41 of the second E-plane waveguide magic T40.

[0050] In this way, the four signal channels are merged into two signal channels after passing through the first E-plane waveguide magic T30 and the second E-plane waveguide magic T40. The two signal channels are respectively connected to the two rectangular waveguide ports 51 of the orthogonal mode converter 50, and finally the two channels are combined into a circular waveguide interface 53, which is used to communicate with the circular waveguide 70. During implementation, the circular waveguide 70 is connected to the low-frequency transmitter for transmitting low-frequency signals, and the circular waveguide 70 has both horizontal polarization and vertical polarization.

[0051] As an alternative, the first E-plane waveguide magic T30 and the second E-plane waveguide magic T40 can also be replaced by H-plane waveguide magic T, and the structure of the entire waveguide cavity needs to be modified.

[0052] Preferably, a polarization converter can be added between one channel before synthesis and the orthogonal mode converter 50. Specifically, in this embodiment 1, a polarization converter 60 is arranged between the output port 42 of the second E-plane waveguide magic T40 and the orthogonal mode converter 50 to reduce the complexity of the structural layout and facilitate the product appearance structure design.

[0053] The working principle of the present invention is as follows: the high-frequency band signal can be directly transmitted through the inner circular waveguide 12 and has both vertical and horizontal polarizations; the low-frequency band signal passes through the inner wall of the outer circular waveguide 11 and then through the cross-shaped waveguide power divider 20 to distribute the signal to four directions of front, back, left, and right; and then through two E-plane waveguide magic T30 and 40, the signals distributed to the four directions are respectively synthesized into two polarization orthogonal signals; the two orthogonal signals are then synthesized into one signal through the orthogonal mode converter 50 and can transmit both vertical and horizontal polarizations at the same time.

[0054] The present invention effectively solves the structural interference problem of high and low frequency simultaneous feeding of coaxial circular waveguides through the above-mentioned structural design of first dividing and then combining low frequency band signals, and through the ingenious connection layout of different types of curved waveguides, while reducing the length of high frequency transmission lines and transmission losses. It also realizes dual-polarization transmission in each frequency band, and can flexibly switch between vertical polarization and horizontal polarization when dual polarization is converted to single polarization.

[0055] Combination Figure 5 to Figure 7As shown, it is a schematic diagram of the specific product structure of the dual-frequency dual-polarization splitter of the present invention. Specifically, the product includes an upper structure 100, a lower structure 300 and a middle structure 200 located between the upper structure 100 and the lower structure 300, wherein the upper structure 100 includes a first upper end face 101 and a first lower end face 102 relative to each other, and a cross waveguide cavity 21 is formed on the first lower end face 102, and the cross waveguide cavity 21 is formed by being recessed from the first lower end face 102 toward the direction close to the first upper end face 101, and a circular hole 103 is provided at the center position of the cross waveguide cavity 21, and the circular hole 103 passes through the first upper end face 101 and the first lower end face 102 of the upper structure 100.

[0056] The middle structure 200 also has a second upper end face 201 and a second lower end face 202 opposite to each other, wherein the second upper end face 201 is the end face close to the first lower end face 102 of the upper structure 100. A cylindrical tube 203 is fixed on the second upper end face 201, and the cylindrical tube 203 is perpendicular to the second upper end face 201 of the middle structure 200, and the cylindrical tube 203 extends upward to the first upper end face 101 of the upper structure 100 through the circular hole 103 on the upper structure 100, and the cylindrical tube 203 is coaxial with the circular hole 103, so that the cylindrical tube 203 and the circular hole 103 form a coaxial inner circular waveguide 12 and outer circular waveguide 11. And the cylindrical tube 203 also penetrates the lower structure 300, that is, the cylindrical tube 203 penetrates the upper structure 100, the middle structure 200 and the lower structure 300.

[0057] Preferably, a first step 26 is further provided on the second upper end surface 201 of the middle layer structure 200, the first step 26 corresponds to the cross waveguide cavity 21, is also distributed in a cross shape, and the cross distribution direction is the same as the cross distribution direction of the cross waveguide cavity 21, the cylindrical tube 203 is located at the center of the first step 26, and the first step 26 is connected to the outer wall of the cylindrical tube 203. The first step 26 is used to optimize the impedance matching of the four ports of the cross waveguide power divider 20 and improve the working bandwidth.

[0058] In addition, a through hole 204 penetrating the middle structure 200 is provided at a certain distance from the end of the first step 26. The step 26 has four ends, and correspondingly, four through holes 206 are also formed. The four through holes 206 are all connected to the cross waveguide cavity 21, specifically, respectively connected to the four output ends of the cross waveguide cavity 21.

[0059] Preferably, a second step 104 is provided at each of the four ends of the cross waveguide cavity 21 corresponding to the four through holes 204, and the second step 104 extends in a direction from the bottom of the cross waveguide cavity 21 to the first lower end surface 102 close to the upper structure, and usually the number of steps of the second step 104 is 2 to 4. The provision of the second step 104 facilitates the transition of the signal from the cross waveguide cavity 21 to the corresponding through hole 204.

[0060] The first low-frequency waveguide cavity 205, the second low-frequency waveguide cavity 206, and the orthogonal mode conversion cavity 207 are respectively arranged on the second lower end surface 202 of the middle structure 200 and the third upper end surface 301 of the lower structure 300. In this way, after the middle structure 200 and the lower structure 300 are attached, the first low-frequency waveguide cavity 205 on the middle structure 200 and the lower structure 300 are combined to form the first E-plane waveguide magic T30, and the second low-frequency waveguide cavity 206 on the middle structure 200 and the lower structure 300 are combined to form the first E-plane waveguide magic T30. The cavity 206 is combined to form a second E-plane waveguide magic T40, and the orthogonal mode conversion cavity 207 on the middle structure 200 and the lower structure 300 is combined to form an orthogonal mode converter 50, wherein the two input ports 31 of the first E-plane waveguide magic T30 are respectively connected to the two through holes 204 on the middle structure 200 located in the first direction, and the two input ports 41 of the second E-plane waveguide magic T40 are respectively connected to the other two through holes 204 on the middle structure 200 located in the second direction perpendicular to the first direction.

[0061] The output port 32 of the first E-plane waveguide magic T30 and the output port 42 of the second E-plane waveguide magic T40 are both connected to the orthogonal mode converter 50 .

[0062] Preferably, half of a polarization conversion cavity 208 is respectively arranged on the second lower end surface 202 of the middle layer structure 200 and on the third upper end surface 301 of the lower layer structure 300 and has corresponding positions. The polarization conversion cavity 208 is arranged between the second low-frequency waveguide cavity 206 and the orthogonal mode conversion cavity 207. After the middle layer structure 200 and the lower layer structure 300 are bonded together, the polarization conversion cavities 208 on the middle layer structure 200 and the lower layer structure 300 are combined to form a polarization converter 60. In this way, the formed polarization converter 60 is arranged between the second E-plane waveguide magic T40 and the orthogonal mode converter 50.

[0063] A half circular waveguide half hole 209 is also provided on the second lower end surface 202 of the middle layer structure 200 and on the third upper end surface 301 of the lower layer structure 300 and has corresponding positions. The circular waveguide half hole 209 is connected to the orthogonal mode conversion cavity 207. In this way, after the middle layer structure 200 and the lower layer structure 300 are bonded together, the circular waveguide half holes 209 on the middle layer structure 200 and the lower layer structure 300 are combined to form a circular waveguide interface 53. The circular waveguide interface 53 is used for externally connecting the circular waveguide 70, and the circular waveguide interface 53 is formed at the output port of the orthogonal mode converter 50.

[0064] The technical contents and technical features of the present invention have been disclosed as above. However, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention and are covered by the claims of this patent application.

Claims

1. A dual-frequency dual-polarization splitter, characterized in that: It includes a coaxial circular waveguide, a cross-shaped waveguide power divider, a first waveguide magic T, a second waveguide magic T and an orthogonal mode converter, wherein the orthogonal mode converter includes two rectangular waveguide ports; The coaxial circular waveguide is located on the central axis of the cross-shaped waveguide power divider and is perpendicular to the top surface of the cross-shaped waveguide power divider. The coaxial circular waveguide includes an outer circular waveguide and an inner circular waveguide located inside the outer circular waveguide. A cross waveguide cavity is formed in the cross waveguide power divider, the cross waveguide cavity is communicated with the outer circular waveguide, and the inner circular waveguide runs through the cross waveguide power divider for transmitting high-frequency signals; The cross-shaped waveguide power divider has four signal channels connected to the cross-waveguide cavity, and the four signal channels are cross-distributed, wherein two signal channels located in a first direction are respectively connected to two input ports of the first waveguide magic T, and the other two signal channels located in a second direction perpendicular to the first direction are respectively connected to two input ports of the second waveguide magic T; The output port of the first waveguide magic T and the output port of the second waveguide magic T are both connected to the input port of the orthogonal mode converter, wherein the output port of the first waveguide magic T and the output port of the second waveguide magic T are respectively connected to two rectangular waveguide ports; The output end of the orthogonal mode converter forms a circular waveguide interface.

2. The dual-frequency dual-polarization splitter according to claim 1, characterized in that: The first waveguide magic T is a first E-plane waveguide magic T, and the second waveguide magic T is a second E-plane waveguide magic T; or the first waveguide magic T is a first H-plane waveguide magic T, and the second waveguide magic T is a second H-plane waveguide magic T.

3. The dual-frequency dual-polarization splitter according to claim 2, characterized in that: A polarization converter is arranged between the second E-plane waveguide magic T and the orthogonal mode converter.

4. The dual-frequency dual-polarization splitter according to any one of claims 1 to 3, characterized in that: The first waveguide magic T and the second waveguide magic T are located on the same plane and do not intersect.

5. The dual-frequency dual-polarization splitter according to claim 1, characterized in that: The splitter also includes a plurality of 90° curved waveguides, and the signal channel of the cross-shaped waveguide power splitter is connected to the input port of the corresponding waveguide magic T through the 90° curved waveguides.

6. The dual-frequency dual-polarization splitter according to claim 5, characterized in that: The 90° curved waveguide includes an E-plane 90° waveguide and an H-plane 90° curved waveguide, one end of the E-plane 90° waveguide is connected to the signal channel of the cross-shaped waveguide power divider, and the other end is connected to one end of the H-plane 90° curved waveguide, and the other end of the H-plane 90° curved waveguide is connected to the input port of the waveguide magic T.

7. A dual-frequency dual-polarization splitter, characterized in that: It includes an upper structure, a lower structure, a middle structure between the upper structure and the lower structure, and a cylindrical tube that runs through the upper, middle and lower structures. The upper structure comprises an upper end face and a lower end face opposite to each other, a cross waveguide cavity is formed on the lower end face, a circular hole penetrating the upper and lower end faces of the upper structure is arranged at the center of the cross waveguide cavity, and the cylindrical tube passes through the circular hole; The middle layer structure is provided with four through holes corresponding to the cross waveguide cavity and distributed in a cross shape, the four output ends of the cross waveguide cavity are connected with the corresponding through holes, and the through holes penetrate the middle layer structure; A first waveguide magic T, a second waveguide magic T, and an orthogonal mode converter are formed on the lower end surface of the middle structure and between the upper end surface of the lower structure, wherein the two input ports of the first waveguide magic T are respectively connected to two through holes located in a first direction on the middle structure, and the two input ports of the second waveguide magic T are respectively connected to another two through holes located in a second direction perpendicular to the first direction on the middle structure, and the orthogonal mode converter includes two rectangular waveguide ports; The output port of the first waveguide magic T and the output port of the second waveguide magic T are both connected to the input port of the orthogonal mode converter, wherein the output port of the first waveguide magic T and the output port of the second waveguide magic T are respectively connected to two rectangular waveguide ports; The output end of the orthogonal mode converter forms a circular waveguide interface.

8. The dual-frequency dual-polarization splitter according to claim 7, characterized in that: A first step corresponding to the cross waveguide cavity is also arranged on the upper end surface of the middle layer structure. The first step is distributed in a cross shape and is connected to the outer wall of the cylindrical tube.

9. The dual-frequency dual-polarization splitter according to claim 7, characterized in that: A second step is disposed at each end of the cross waveguide cavity corresponding to the four through holes.

10. The dual-frequency dual-polarization splitter according to claim 7, characterized in that: A polarization converter is also formed between the lower end surface of the middle structure and the upper end surface of the lower structure, and the polarization converter is arranged between the second waveguide magic T and the orthogonal mode converter.

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