A carbon fiber mesh double reflector high gain antenna

Abstract

The present invention discloses a carbon fiber mesh double reflector high-gain antenna, comprising: a sub-reflector, a sub-reflector support rod, a feed source and a main reflector; the outer convex surface of the main reflector is installed on the detector, and the inner concave surface of the main reflector is a rotational parabola; the main reflector adopts a woven mesh structure; the outer convex surface of the sub-reflector is a rotational hyperboloid, and the sub-reflector and the main reflector are connected by two or more sub-reflector support rods; a through hole is provided on the main reflector and at the vertex of the rotational parabola, and the feed source runs through the through hole. The present invention has the characteristics of high gain, high efficiency, deep low temperature resistance, high thermal stability, and ultra-lightweight, can realize deep space ultra-long distance communication, meet the strict requirements of the carrier on weight and envelope, and can work normally at a wide temperature range on-orbit operating temperature, and meet the mission requirements of small celestial body detection.

Description

Technical Field

[0001] The invention belongs to the technical field of satellite-borne microwave antennas, and in particular relates to a carbon fiber mesh double-reflecting surface high-gain antenna. Background Art

[0002] With the continuous development of my country's deep space exploration technology, in the small celestial body exploration mission, the flight distance of the detector is getting farther and farther, and the antenna installed on the detector faces the following problems:

[0003] (1) The requirements for data transmission are getting higher and higher, requiring the antenna to be able to realize ground measurement and control and data transmission functions when the distance between the device and the ground is greater than 2 million kilometers. To solve this problem, the antenna needs to have the characteristics of high gain and high efficiency;

[0004] (2) The on-orbit temperature is becoming more and more severe. The antenna faces a wide temperature range of -185℃ to +125℃. To solve this problem, the antenna needs to have the characteristics of deep low temperature resistance and high thermal stability, so that it can work normally under the harsh on-orbit temperature;

[0005] (3) The structure is required to be ultra-lightweight. Lightweight structure is an important means to improve the performance of aerospace equipment. Currently, the commonly used high-gain antennas for small celestial body detection are reflector antennas and radial line slot antennas. Among them, radial line slot antennas cannot achieve the same transmission and reception, and two sets of antennas are required to realize related functions, which is unfavorable to the overall size, weight and surface layout of the antenna. Reflector antennas can achieve the same transmission and reception, and have a smaller envelope size, but the structure can still be further lightweight.

[0006] In summary, in the small celestial body exploration mission, the antenna installed on the detector must have the characteristics of high gain, high efficiency, deep low temperature resistance, high thermal stability, and ultra-lightweight to meet the detection mission requirements of the detector. Summary of the invention

[0007] In view of this, the present invention provides a carbon fiber mesh double-reflector high-gain antenna with the characteristics of high gain, high efficiency, deep low temperature resistance, high thermal stability, and ultra-lightweight. It can realize ultra-long-distance communication in deep space, meet the stringent requirements of weight and envelope for transportation, and can work normally at on-orbit operating temperatures in a wide temperature range, meeting the mission requirements of small celestial body detection.

[0008] The present invention is achieved through the following technical solutions:

[0009] A carbon fiber mesh double-reflector high-gain antenna, comprising: a sub-reflector, a sub-reflector support rod, a feed source and a main reflector;

[0010] The outer convex surface of the main reflective surface is installed on the detector, and the inner concave surface of the main reflective surface is the working surface, and the working surface of the main reflective surface is a rotating parabola; the main reflective surface adopts a woven mesh structure;

[0011] The outer convex surface of the sub-reflector is a working surface, and the working surface of the sub-reflector is a rotational hyperboloid;

[0012] The secondary reflector and the primary reflector are connected by two or more secondary reflector support rods, the working surface of the primary reflector is opposite to the working surface of the secondary reflector, and the virtual focus of the rotating hyperboloid coincides with the focus of the rotating parabola;

[0013] A through hole is arranged on the main reflection surface and at the vertex of the rotating parabola, a feed source passes through the through hole, and a phase center of the feed source is located at the real focus of the rotating hyperboloid.

[0014] Furthermore, the cross section of each of the secondary reflector support rods is elliptical.

[0015] Furthermore, the outer convex surface of the main reflective surface is provided with main reflective surface back ribs, and the main reflective surface back ribs include: radial main ribs, radial auxiliary ribs, annular main ribs, an outer sealing frame and an inner sealing frame;

[0016] The outer sealing frame is arranged at the outer edge of the main reflecting surface, the inner sealing frame is arranged at the vertex of the main reflecting surface, the annular main ribs are arranged coaxially with the main reflecting surface, and are located between the outer sealing frame and the inner sealing frame; more than three radial main ribs and an equal number of radial auxiliary ribs are alternately arranged at intervals along the circumferential direction on the outer convex surface of the main reflecting surface, and are evenly distributed, one end of each radial main rib is fixedly connected to the outer sealing frame, and the other end is fixedly connected to the annular main rib; one end of each radial auxiliary rib is fixedly connected to the outer sealing frame, the middle part is fixedly connected to the annular main rib, and the other end is fixedly connected to the inner sealing frame.

[0017] Furthermore, the radial main reinforcement and the radial auxiliary reinforcement both adopt closed "Ω"-shaped beams with variable curve cross-sections, and the annular main reinforcement adopts closed "Ω"-shaped beams.

[0018] Furthermore, the feed source is shared by both transmitting and receiving, and includes: a horn, a polarizer, a waveguide and a waveguide;

[0019] The waveguide is a "T"-shaped dual-path waveguide integrated structure, and the two ends of the horizontal part of the "T" are respectively a receiving end and a transmitting end, and the vertical part of the "T" is a dual-path structure, which is connected to the receiving end and the transmitting end respectively, and a flange D is provided at the end of the vertical part of the "T";

[0020] Both ends of the polarizer are provided with flanges, namely flange A and flange B. One end of the polarizer is fixedly connected to the horn through flange A, and the other end is fixedly connected to flange D of the waveguide through flange B. The waveguide is connected to the receiving end of the waveguide;

[0021] The feed source is also connected to the main reflector through a flange B. The waveguide and waveguide are located on the outer convex side of the main reflector, and the polarizer and horn are located on the inner concave side of the main reflector. The flange B of the polarizer is also provided with symmetrically distributed triangular reinforcement ribs.

[0022] Furthermore, the sub-reflecting surface is shaped and designed to modify the standard hyperboloid into a non-standard hyperboloid, and the phase distribution at the aperture is made uniform.

[0023] Furthermore, the secondary reflective surface is formed by molding carbon fiber woven cloth, and the material of the primary reflective surface is a high modulus carbon fiber material.

[0024] Furthermore, the secondary reflector support rod is molded from a high modulus carbon fiber material.

[0025] Furthermore, the cross-sections of the inner sealing frame and the outer sealing frame are both "n"-shaped.

[0026] Furthermore, a main reflector and feed source interface is provided on the inner sealing frame, and the feed source and the main reflector surface are connected through the main reflector and feed source interface;

[0027] The annular main ribs are provided with secondary reflector support rod interfaces and main reflector and star body interfaces, and the main reflector surface is connected to the secondary reflector support rod through the secondary reflector support rod interface; the main reflector surface is connected to the detector through the main reflector and star body interface, so that the outer convex surface of the main reflector surface is installed on the detector.

[0028] Beneficial effects:

[0029] (1) The present invention uses a Cassegrain type double reflector antenna in the reflector antenna, that is, the outer convex surface of the main reflector is installed on the detector, the inner concave surface of the main reflector is the working surface, and the working surface of the main reflector is a rotating parabola; the outer convex surface of the sub-reflector is the working surface, and the working surface of the sub-reflector is a rotating hyperboloid; the sub-reflector and the main reflector are connected by two or more sub-reflector support rods, the working surface of the main reflector is opposite to the working surface of the sub-reflector, and the virtual focus of the rotating hyperboloid coincides with the focus of the rotating parabola; the main reflector Through holes are provided on the projection surface and at the vertices of the rotating parabola, the feed source passes through the through holes, and the phase center of the feed source is located at the real focus of the rotating hyperboloid; the present invention adopts a Cassegrain type (parabola and hyperbola) double-reflector antenna, which can achieve high gain and a smaller envelope size. Compared with a ring-focus type (a rotating surface whose mother line is a parabola and an elliptical arc) double-reflector antenna, the requirement for assembly accuracy is relatively reduced, which is convenient for engineering implementation; the main reflector of the present invention adopts a mesh structure, thereby structurally realizing the lightweight of the antenna.

[0030] (2) The cross-section of each sub-reflector support rod of the present invention is elliptical. Compared with rectangular, square, circular and diamond cross-sections, the elliptical cross-section can effectively reduce antenna performance loss.

[0031] (3) The outer convex surface of the main reflective surface of the present invention is provided with a main reflective surface back rib, wherein the outer sealing frame 10 is arranged at the large diameter end of the main reflective surface, the inner sealing frame 11 is arranged at the small diameter end of the main reflective surface, and the annular main rib is coaxially arranged with the main reflective surface and is located between the outer sealing frame 10 and the inner sealing frame 11; more than three radial main ribs and an equal number of radial auxiliary ribs are alternately arranged along the circumferential direction on the outer convex surface of the main reflective surface and are evenly distributed, one end of each radial main rib is fixedly connected to the outer sealing frame 10, and the other end is fixedly connected to the annular main rib; one end of each radial auxiliary rib is fixedly connected to the outer sealing frame 10, the middle part is fixedly connected to the annular main rib, and the other end is fixedly connected to the inner sealing frame 11, thereby ensuring the rigidity of the structure.

[0032] (4) The radial main reinforcement and radial auxiliary reinforcement of the present invention adopt closed "Ω"-shaped beams with variable curve sections, and the circumferential main reinforcement adopts closed "Ω"-shaped beams, and the laying methods are optimized. The setting of the closed "Ω"-shaped beam ensures the stability of the back reinforcement during the forming stage, and the optimized laying method further ensures that the thermal deformation of the back reinforcement and the main reflective surface matches, thereby ensuring the overall thermal stability of the main reflective surface. At the same time, the radial main reinforcement and radial auxiliary reinforcement adopt variable curve sections to achieve maximum lightweight, while also ensuring high support stiffness for the main reflective surface.

[0033] (5) The waveguide of the present invention is a "T"-shaped dual-path waveguide integrated structure, which can realize the sharing of transmission and reception. The end where the polarizer flange B of the present invention is located is provided with evenly distributed triangular reinforcing ribs on the step surface formed by the flange and the polarizer, which can effectively improve the rigidity of the feed source.

[0034] (6) The sub-reflector of the present invention is shaped and designed to modify the standard hyperboloid into a non-standard hyperboloid, so that the phase distribution at the aperture is uniform, thereby fully improving the efficiency of the reflector antenna.

[0035] (7) The material of the main reflective surface of the present invention is a high modulus carbon fiber material, and the secondary reflective surface is molded by carbon fiber woven cloth, and the carbon fiber material is further lightweight. At the same time, the main reflective surface uses high modulus carbon fiber to ensure the rigidity of the structure.

[0036] (8) The sub-reflector support rod of the present invention is molded from high-modulus and high-elasticity carbon fiber material, and the layering method during the molding process is optimized to ensure the overall stiffness of the reflector antenna and reduce the pointing accuracy deviation caused by thermal deformation.

[0037] In summary, the weight of the whole machine of the present invention is less than 5kg, the antenna is shared by both transmission and reception, the receiving gain within the beam angle range of ±0.35° is greater than 38dBi, the transmitting gain is greater than 39dBi, the isolation of the antenna transceiver ports is greater than 20dB, the maximum input power is 105W, the first-order fundamental frequency of the antenna in three directions is greater than 70Hz, and the pointing accuracy caused by thermal deformation is better than ±0.01°; the present invention has passed the -230℃ low-temperature storage test assessment, and the antenna surface accuracy consistency before and after the test is good, indicating that the reflector antenna of the present invention can withstand extreme low temperature environments; the present invention has also passed the thermal deformation measurement test assessment using a solar simulator to simulate the on-orbit temperature environment. The consistency of the temperature field conditions in the test and the antenna surface accuracy before and after the test are good, indicating that the reflector antenna of the present invention has high thermal stability and can adapt to the wide temperature range of -185℃ to +125℃ on-orbit; at the same time, the present invention has also passed the test conditions assessment of the mechanics environment for the exploration of small celestial bodies in my country. Therefore, the present invention has the characteristics of high gain, small envelope size, ultra-lightweight, deep low temperature resistance, high thermal stability and high efficiency, and has a large design margin, which can meet the mission requirements of small celestial body detection and realize ultra-long-distance communication in deep space. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 Schematic diagram of the structure of the secondary reflector of the present invention;

[0040] Figure 3 It is a schematic diagram of the carbon fiber mesh structure of the main reflective surface of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the secondary reflector support rod of the present invention;

[0042] Figure 5 This is a schematic diagram of the back rib structure of the main reflector surface of the present invention;

[0043] Figure 6 It is a schematic cross-sectional view of radial main reinforcement, radial auxiliary reinforcement and annular main reinforcement of the present invention;

[0044] Figure 7 is a schematic cross-sectional view of the inner sealing frame and the outer sealing frame of the present invention;

[0045] Figure 8 This is a schematic diagram of the feed structure of the reflector antenna of the present invention;

[0046] Among them, 1-sub-reflector, 2-sub-reflector support rod, 3-feed source, 4-main reflector, 5-main reflector back rib, 7-radial main rib, 8-radial auxiliary rib, 9-circumferential main rib, 10-outer sealing frame, 11-inner sealing frame, 12-main reflector and feed source interface, 13-main reflector and star interface, 14-sub-reflector support rod interface, 16-horn, 17-polarizer, 18-waveguide, 19-waveguide. DETAILED DESCRIPTION

[0047] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0048] This embodiment provides a carbon fiber mesh double reflector high gain antenna, see attached Figure 1 , adopting a Cassegrain double-reflector antenna, comprising: a sub-reflector 1, a sub-reflector support rod 2, a feed source 3 and a main reflector 4;

[0049] The outer convex surface of the main reflective surface 4 is installed on the detector, and the inner concave surface of the main reflective surface 4 is a working surface. The working surface of the main reflective surface 4 is a rotating parabola, which is used to reflect signal waves. The outer convex surface of the main reflective surface 4 is provided with a main reflective surface back rib 5, which is used to ensure the structural strength of the main reflective surface 4;

[0050] The outer convex surface of the sub-reflector 1 is a working surface, and the working surface of the sub-reflector 1 is a rotational hyperboloid, which is used to reflect signal waves;

[0051] The secondary reflector 1 and the primary reflector 4 are connected via two or more secondary reflector support rods 2, the working surface of the primary reflector 4 is opposite to the working surface of the secondary reflector 1, and the virtual focus of the rotating hyperboloid coincides with the focus of the rotating parabola;

[0052] A through hole is arranged on the main reflection surface 4 at the vertex of the rotating parabola, and the feed source 3 is arranged through the through hole, and the phase center of the feed source 3 is located at the real focus of the rotating hyperboloid. The feed source 3 is used to transmit and receive signal waves.

[0053] See attached Figure 2 The sub-reflector 1 is shaped and modified from a standard hyperboloid to a non-standard hyperboloid, so that the phase distribution at the aperture is uniform and the efficiency of the reflector antenna is fully improved. The sub-reflector 1 is a symmetrical structure, which makes the performance of each normal section of the sub-reflector 1 consistent; the sub-reflector 1 is molded with carbon fiber woven cloth to achieve lightweight; the aperture Φ of the sub-reflector 1 is 0.35m.

[0054] See attached Figure 3The main reflector 4 adopts a woven mesh structure, the material is a high modulus carbon fiber material, and the mesh size of the mesh structure is designed according to the electrical performance simulation results; by adopting a mesh structure of carbon fiber material, the antenna is further lightweight, and the high modulus carbon fiber material is used to ensure structural rigidity; the aperture Φ of the main reflector 4 is 1.5m.

[0055] See attached Figure 4 The cross section of each of the sub-reflector support rods 2 is elliptical. Compared with rectangular, square, circular and diamond cross sections, the elliptical cross section can effectively reduce the antenna performance loss. The sub-reflector support rod 2 is molded with high modulus and high elasticity carbon fiber material, and the plying method during the molding process is optimized to ensure the overall stiffness of the reflector antenna and reduce the pointing accuracy deviation caused by thermal deformation. Joints are provided at both ends of each sub-reflector support rod 2, and the joints are connected to the main reflector 4 and the sub-reflector 1 using 2-M4 screws.

[0056] See attached Figure 5 The main reflector back ribs 5 are all optimized for the ply to ensure the structural strength of the main reflector 4. The main reflector back ribs 5 include: radial main ribs 7, radial auxiliary ribs 8, annular main ribs 9, an outer sealing frame 10 and an inner sealing frame 11;

[0057] The outer sealing frame 10 is arranged at the large diameter end of the main reflecting surface 4, the inner sealing frame 11 is arranged at the small diameter end of the main reflecting surface 4 (i.e., the end where the through hole is located), the annular main ribs 9 are arranged coaxially with the main reflecting surface 4, and are located between the outer sealing frame 10 and the inner sealing frame 11; more than three radial main ribs 7 and the same number of radial auxiliary ribs 8 are alternately arranged at intervals along the circumferential direction on the outer convex surface of the main reflecting surface 4, and are evenly distributed, one end of each radial main rib 7 is fixedly connected to the outer sealing frame 10, and the other end is fixedly connected to the annular main rib 9; one end of each radial auxiliary rib 8 is fixed to the outer sealing frame 10 The middle part is fixedly connected to the annular main rib 9, and the other end is fixedly connected to the inner sealing frame 11; the inner sealing frame 11 is provided with a main reflection and feed source interface 12, and the feed source 3 is connected to the main reflection and feed source interface 12 by 4-M4 screws, so as to realize the connection between the feed source 3 and the main reflection surface 4; the annular main rib 9 is provided with a secondary reflection support rod interface 14 and a main reflection and star body interface 13, and the main reflection surface 4 is connected to the secondary reflection surface support rod 2 through the secondary reflection support rod interface 14; the main reflection surface 4 is connected to the detector through the main reflection and star body interface 13, so that the outer convex surface of the main reflection surface 4 is installed on the detector;

[0058] See attached Figure 6The radial main reinforcement 7 and the radial auxiliary reinforcement 8 adopt a closed "Ω" type beam with a variable curve section. The variable curve section can achieve lightweight to the greatest extent while ensuring high support stiffness for the main reflective surface 4; the circumferential main reinforcement 9 adopts a closed "Ω" type beam; the setting of the closed "Ω" type beam ensures the stability of the back reinforcement in the forming stage, and the optimized design of the ply further ensures that the thermal deformation of the main reflective surface back reinforcement 5 matches that of the main reflective surface 4, thereby ensuring the overall thermal stability of the main reflective surface 4; see attached Figure 7 The cross sections of the inner sealing frame 11 and the outer sealing frame 10 are both "n"-shaped.

[0059] See attached Figure 8 The feed source 3 can be used for both transmission and reception, and includes: a horn 16, a polarizer 17, a waveguide 18 and a waveguide 19;

[0060] The speaker 16 is in the form of a corrugated cone speaker, with a diameter Φ of 82 mm and a length of 125 mm. A flange is provided on the speaker 16;

[0061] The polarizer 17 is a waveguide diaphragm polarizer with a length of 145 mm; flanges are provided at both ends of the polarizer 17, namely flange A and flange B;

[0062] The waveguide 18 is a "T"-shaped dual-path waveguide integrated structure, and the two ends of the horizontal part of the "T" are the receiving end and the transmitting end respectively, the length between the receiving end and the transmitting end is 311.5 mm, and the receiving end is provided with a flange C, which is a BJ84 standard flange; the vertical part of the "T" is a dual-path structure, which is connected to the receiving end and the transmitting end respectively, and the end of the "T"-shaped vertical part is provided with a flange D;

[0063] The waveguide 19 is a standard BJ84 waveguide converter, and the waveguide length is 48.5 mm.

[0064] The connection relationship between the components of feed source 3 is:

[0065] The flange provided on the speaker 16 is fixedly connected to the flange A of the polarizer 17 by 4-M3 screws, the flange D of the waveguide 18 is fixedly connected to the flange B of the polarizer 17 by 8-M3 screws, and the waveguide 19 is connected to the receiving end of the waveguide 18 by 4-M4 screws and the flange C of the waveguide 18;

[0066] The feed source 3 is also connected to the main reflection surface 4 through the flange B. The waveguide 18 and the waveguide 19 are located on the outer convex side of the main reflection surface 4, and the polarizer 17 and the horn 16 are located on the inner concave side of the main reflection surface 4. The flange B of the polarizer 17 is also provided with symmetrically distributed triangular reinforcement ribs, which can effectively improve the rigidity of the feed source 3.

[0067] The whole machine of the present invention weighs less than 5kg, the receiving gain within the beam angle range of 0.35° is greater than 38dBi, the transmitting gain is greater than 39dBi, the antenna transmitting and receiving port isolation is greater than 20dB, the maximum input power is 105W, the three-way first-order fundamental frequency of the antenna is greater than 70Hz, it can withstand an extreme low temperature environment of -230℃, and can adapt to a wide temperature range of -185℃ to +125℃ on orbit. At the same time, it has the characteristics of high gain, small envelope size, ultra-lightweight, deep low temperature resistance, high thermal stability and high efficiency, etc., which can meet the mission requirements of small celestial body detection and realize ultra-long-distance communication in deep space.

[0068] Working principle:

[0069] When the antenna transmits a signal wave, the detector transmits a spherical wave through the feed source 3, and the spherical wave is reflected by the working surface of the secondary reflector 1 and the working surface of the main reflector 4 in turn to be a plane wave for transmission;

[0070] When the antenna receives a signal wave, the external plane wave is reflected by the working surface of the main reflector 4 and the working surface of the sub-reflector 1 in turn and then converges at the phase center of the feed source 3. The feed source 3 receives and transmits the signal wave to the detector.

[0071] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon fiber mesh double reflector high gain antenna, characterized in that: include: A sub-reflecting surface (1), a sub-reflecting surface supporting rod (2), a feed source (3) and a main reflecting surface (4); The outer convex surface of the main reflection surface (4) is mounted on the detector, the inner concave surface of the main reflection surface (4) is a working surface, and the working surface of the main reflection surface (4) is a rotational parabola; the main reflection surface (4) adopts a woven mesh structure; The outer convex surface of the secondary reflector (1) is a working surface, and the working surface of the secondary reflector (1) is a rotational hyperboloid; The secondary reflector (1) and the primary reflector (4) are connected via two or more secondary reflector support rods (2); the working surface of the primary reflector (4) and the working surface of the secondary reflector (1) are opposite to each other, and the virtual focus of the rotating hyperboloid coincides with the focus of the rotating parabola; A through hole is provided on the main reflection surface (4) at the vertex of the rotating parabola, the feed source (3) is provided through the through hole, and the phase center of the feed source (3) is located at the real focus of the rotating hyperboloid; The outer convex surface of the main reflective surface (4) is provided with main reflective surface back ribs (5), and the main reflective surface back ribs (5) include: radial main ribs (7), radial auxiliary ribs (8), annular main ribs (9), an outer sealing frame (10) and an inner sealing frame (11); The outer sealing frame (10) is arranged at the outer edge of the main reflection surface (4), the inner sealing frame (11) is arranged at the vertex of the main reflection surface (4), the annular main rib (9) is arranged coaxially with the main reflection surface (4), and is located between the outer sealing frame (10) and the inner sealing frame (11); more than three radial main ribs (7) and an equal number of radial auxiliary ribs (8) are alternately arranged at intervals along the circumferential direction on the outer convex surface of the main reflection surface (4), and are evenly distributed; one end of each radial main rib (7) is fixedly connected to the outer sealing frame (10), and the other end is fixedly connected to the annular main rib (9); one end of each radial auxiliary rib (8) is fixedly connected to the outer sealing frame (10), the middle part is fixedly connected to the annular main rib (9), and the other end is fixedly connected to the inner sealing frame (11); The feed source (3) is used for both transmission and reception, and comprises: a horn (16), a polarizer (17), a waveguide (18) and a waveguide (19); The waveguide (18) is a "T"-shaped dual-path waveguide integrated structure, the two ends of the horizontal part of the "T" are the receiving end and the transmitting end respectively, the vertical part of the "T" is a dual-path structure, connected to the receiving end and the transmitting end respectively, and the end of the vertical part of the "T" is provided with a flange D; Both ends of the polarizer (17) are provided with flanges, namely flange A and flange B. One end of the polarizer (17) is fixedly connected to the horn (16) through flange A, and the other end is fixedly connected to flange D of the waveguide (18) through flange B. The waveguide (19) is connected to the receiving end of the waveguide (18); The feed source (3) is also connected to the main reflection surface (4) via a flange B, the waveguide (18) and the waveguide (19) are located on the outer convex side of the main reflection surface (4), and the polarizer (17) and the horn (16) are located on the inner concave side of the main reflection surface (4); the flange B of the polarizer (17) is also provided with symmetrically distributed triangular reinforcing ribs; The secondary reflector (1) is shaped and designed to modify a standard hyperboloid into a non-standard hyperboloid, and to make the phase distribution at the aperture uniform.

2. A carbon fiber mesh double reflector high gain antenna as claimed in claim 1, characterized in that: The cross section of each secondary reflector support rod (2) is elliptical.

3. A carbon fiber mesh double reflector high gain antenna as claimed in claim 1, characterized in that: The radial main reinforcement (7) and the radial auxiliary reinforcement (8) both adopt closed "Ω"-shaped beams with variable curved cross-sections, and the annular main reinforcement (9) adopts closed "Ω"-shaped beams.

4. A carbon fiber mesh double reflector high gain antenna as claimed in any one of claims 1 to 3, characterized in that: The secondary reflective surface (1) is formed by molding carbon fiber woven cloth, and the material of the primary reflective surface (4) is a high modulus carbon fiber material.

5. A carbon fiber mesh double reflector high gain antenna as claimed in any one of claims 1 to 3, characterized in that: The secondary reflector support rod (2) is molded from a high modulus carbon fiber material.

6. A carbon fiber mesh double reflector high gain antenna as claimed in claim 1, characterized in that: The cross-sections of the inner sealing frame (11) and the outer sealing frame (10) are both "n"-shaped.

7. A carbon fiber mesh double reflector high gain antenna as claimed in claim 1, characterized in that: The inner sealing frame (11) is provided with a main reflector and feed source interface (12), and the feed source (3) and the main reflection surface (4) are connected via the main reflector and feed source interface (12); The annular main rib (9) is provided with a secondary reflector support rod interface (14) and a main reflector and star body interface (13); the main reflector surface (4) is connected to the secondary reflector surface support rod (2) via the secondary reflector support rod interface (14); the main reflector surface (4) is connected to the detector via the main reflector and star body interface (13), so that the outer convex surface of the main reflector surface (4) is mounted on the detector.

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