Structure and method for adjusting position of auxiliary reflecting surface of double-reflecting-surface antenna

Abstract

The invention belongs to the technical field of antennas, and particularly relates to a structure and a method for adjusting the position of an auxiliary reflecting surface of a double-reflecting-surface antenna. The device comprises an auxiliary reflecting surface, the auxiliary reflecting surface is provided with a rectangular boss, the rectangular boss is sleeved with an X-direction adjusting plate, the X-direction adjusting plate is connected with an X-direction adjusting screw, and the X-direction adjusting screw is in contact with the rectangular boss; the upper portion of the X-direction adjusting plate is sleeved with a Y-direction adjusting plate, the Y-direction adjusting plate is connected with a Y-direction adjusting screw, and the Y-direction adjusting screw makes contact with the X-direction adjusting plate. An installation cylinder is arranged on the upper portion of the Y-direction adjusting plate and connected with a fixing column, the fixing column is sleeved with a fixing barrel, the fixing barrel is connected with a Z-direction adjusting screw, and the Z-direction adjusting screw makes contact with the fixing column. The fixed cylinder is connected with a Z-direction adjusting plate; the Z-direction adjusting plate is connected with one end, far away from the main reflecting surface, of a supporting rod of the antenna; a Z-direction compression spring is arranged between the fixing column and the Z-direction adjusting plate. The invention provides a structure and a method for adjusting the position of an auxiliary reflecting surface of a double-reflecting-surface antenna, which are used for respectively adjusting and locking the position of the auxiliary reflecting surface along the radial direction (X direction and Y direction) and the axial direction (Z direction) of the antenna so as to solve the engineering problem of adjusting the position of the auxiliary reflecting surface of some high-frequency-band high-precision double-reflecting-surface antennas.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and particularly relates to a structure and method for adjusting the position of a sub-reflector of a dual-reflector antenna. Background Art

[0002] A dual-reflector antenna is composed of a main reflector, a sub-reflector, and a feed source, and has the characteristics of compact structure, high gain, low side lobes, low noise, etc. It is currently widely used in both military and civilian fields. Due to the influence of factors such as structural design, part processing, and antenna assembly, the actual position of the sub-reflector of the antenna in engineering applications is difficult to completely coincide with the theoretical position, resulting in deviations, which lead to the deterioration of the electrical performance of the antenna, such as a decrease in gain, deviation in pointing, and an increase in side lobe level. For this reason, the common method in engineering applications is to adjust the position of the sub-reflector by changing the length of the support rod that fixes the sub-reflector. As is well known, the number of support rods for fixing the sub-reflector is at least 3. When adjusting the position of the sub-reflector, it is necessary to adjust the length of each support rod one by one. When adjusting the length of the support rod, it will simultaneously change the deviation distances of the sub-reflector along the axial and radial directions of the antenna. Therefore, the adjustment process is troublesome, inefficient, and the adjustment accuracy is not high, which is not suitable for the adjustment of the position of the sub-reflector of some high-frequency and high-precision dual-reflector antennas. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a structure and method for adjusting the position of a sub-reflector of a dual-reflector antenna, which respectively adjusts and locks the position of the sub-reflector along the radial direction (X and Y directions) and the axial direction (Z direction) of the antenna, so as to solve the engineering problem of adjusting the position of the sub-reflector of some high-frequency and high-precision dual-reflector antennas.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A structure for adjusting the position of a sub-reflector of a dual-reflector antenna includes a sub-reflector, on which a rectangular boss is provided. An X-direction adjustment plate is sleeved on the rectangular boss, and an X-direction adjustment screw is connected to the X-direction adjustment plate and contacts the rectangular boss; an upper part of the X-direction adjustment plate is sleeved with a Y-direction adjustment plate, and a Y-direction adjustment screw is connected to the Y-direction adjustment plate and contacts the X-direction adjustment plate; an upper part of the Y-direction adjustment plate is provided with an installation cylinder, the installation cylinder is connected with a fixed column, a fixed cylinder is sleeved outside the fixed column, and a Z-direction adjustment screw is connected to the fixed cylinder and contacts the fixed column; a Z-direction adjustment plate is connected to the fixed cylinder, and the Z-direction adjustment plate is connected to one end of the support rod of the antenna away from the main reflector; a Z-direction compression spring is arranged between the fixed column and the Z-direction adjustment plate.

[0006] The adjustment structure proposed by the present invention adjusts and locks the offsets in the X, Y, and Z directions respectively according to the test results after the antenna assembly is completed. The adjustments in each direction do not affect each other, and the adjustment is convenient, with high precision and high efficiency.

[0007] All components of the adjustment structure proposed by the present invention are located behind the sub-reflector, without blocking the antenna's field of view and without degrading the antenna's electrical performance.

[0008] The adjustment structure proposed by the present invention is applicable to adjusting the position of the sub-reflector before leaving the factory to eliminate the errors generated during the machining and assembly of parts; it is also applicable to adjusting the position of the sub-reflector during the user's use after leaving the factory to eliminate the offset of the sub-reflector position caused by other factors during use.

[0009] As a preferred solution of the present invention, an X-direction compression spring is provided between the rectangular boss and the X-direction adjustment plate, and a Y-direction compression spring is provided between the X-direction adjustment plate and the Y-direction adjustment plate.

[0010] As a preferred solution of the present invention, an installation through-hole is provided in the middle of the Z-direction adjustment plate, the installation cylinder passes through the installation through-hole, and the Z-direction compression spring is sleeved on the installation cylinder.

[0011] As a preferred solution of the present invention, X-direction installation waist-shaped holes are provided on the X-direction adjustment plate, and X-direction fixing screws connected to the sub-reflector are provided in the X-direction installation waist-shaped holes; Y-direction installation waist-shaped holes are provided on the Y-direction adjustment plate, and Y-direction fixing screws connected to the X-direction adjustment plate are provided in the Y-direction installation waist-shaped holes; the Z-direction adjustment plate is sleeved on the upper part of the Y-direction adjustment plate, Z-direction installation waist-shaped holes are provided on the Z-direction adjustment plate, and Z-direction fixing screws connected to the Y-direction adjustment plate are provided in the Z-direction installation waist-shaped holes.

[0012] As a preferred solution of the present invention, a plurality of rectangular through-cavities are provided on the Z-direction adjustment plate, and the positions of the plurality of rectangular through-cavities correspond to the X-direction fixing screws and the Y-direction fixing screws respectively.

[0013] As a preferred solution of the present invention, when each component is in the theoretical position, W2 = W1 + δ + δ, where W1 is the width of the rectangular boss on the sub-reflector in the X direction, δ is the maximum adjustment distance in a single direction, and W2 is the width of the concave cavity on the X-direction adjustment plate in the X direction; W4 = W3 + δ + δ, where W3 is the width of the upper part of the X-direction adjustment plate in the Y direction, W4 is the width of the concave cavity on the Y-direction adjustment plate in the Y direction; the distance between the top surface of the fixing column and the top surface of the cylindrical concave cavity on the fixing cylinder is not less than δ.

[0014] As a preferred solution of the present invention, the lengths L of the X-direction installation waist-shaped holes, the Y-direction installation waist-shaped holes, and the Z-direction installation waist-shaped holes are L = δ + δ, where L is the distance between the centers of the two arcs of the waist-shaped hole.

[0015] As a preferred embodiment of the present invention, mounting lugs are provided at the four corners of the Z-direction adjustment plate, and the Z-direction adjustment plate is connected to the support rod through the mounting lugs.

[0016] As a preferred embodiment of the present invention, the fixed cylinder and the Z-direction adjustment plate are fixed by fastening screws.

[0017] A method for adjusting the position of the sub-reflector of a dual-reflector antenna includes the following steps:

[0018] X-direction adjustment process: Rotate the X-direction adjustment screw on the X-direction adjustment plate to push the sub-reflector to move in the positive or negative X direction by ΔX;

[0019] Y-direction adjustment process: Rotate the Y-direction adjustment screw on the Y-direction adjustment plate to push the X-direction adjustment plate to move in the positive or negative Y direction by ΔY;

[0020] Z-direction adjustment process: If it is necessary to adjust in the negative Z direction, rotate the adjustment screw on the fixed cylinder clockwise to push the fixed column to move in the negative Z direction by ΔZ; if it is necessary to adjust in the positive Z direction, rotate the adjustment screw on the fixed cylinder counterclockwise, and the fixed column moves in the positive Z direction by ΔZ under the resilience of the Z-direction compression spring.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The adjustment structure proposed by the present invention adjusts and locks the offsets in the X, Y, and Z directions respectively according to the test results after the antenna is assembled. The adjustments in each direction do not affect each other, and the adjustment is convenient, with high precision and high efficiency.

[0023] 2. For the adjustment structure proposed by the present invention, all components are located behind the sub-reflector, without blocking the antenna's field of view and without degrading the antenna's electrical performance.

[0024] 3. The adjustment structure proposed by the present invention is applicable to both adjusting the position of the sub-reflector before leaving the factory to eliminate the errors generated during the part processing and assembly processes, and adjusting the position of the sub-reflector during the user's operation after leaving the factory to eliminate the offset of the sub-reflector position caused by other factors during the use process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is an exploded view of the present invention;

[0027] Figure 3 is Figure 1 the cross-sectional view at A-A in

[0028] Figure 4 is Figure 1Cross-sectional view taken along line B-B;

[0029] Figure 5 is an axonometric view of the sub-reflector;

[0030] Figure 6 is an axonometric view of the X-direction adjustment plate;

[0031] Figure 7 is an axonometric view of the Y-direction adjustment plate;

[0032] Figure 8 is an axonometric view of the Z-direction adjustment plate;

[0033] Figure 9 is an orthographic projection view of the fixing post;

[0034] Figure 10 is a sectional view of the fixing cylinder;

[0035] Figure 11 is a view of the kidney-shaped hole;

[0036] Figure 12 is an axonometric view of a certain dual-reflector antenna.

[0037] In the figure: 1 - sub-reflector; 2 - X-direction adjustment plate; 3 - Y-direction adjustment plate; 4 - main reflector; 5 - fixing post; 6 - fixing cylinder; 7 - Z-direction adjustment plate; 8 - support rod; 9 - feed source; 11 - reflector body; 12 - rectangular boss; 13 - X-direction compression spring; 14 - X-direction spring mounting hole; 15 - X-direction fixed mounting threaded hole; 21 - X-direction adjustment screw; 22 - Y-direction compression spring; 23 - X-direction mounting kidney-shaped hole; 24 - X-direction fixing screw; 25 - X-direction adjustment mounting threaded hole; 26 - Y-direction spring mounting hole; 27 - Y-direction fixed mounting threaded hole; 31 - Y-direction adjustment screw; 32 - Y-direction mounting kidney-shaped hole; 33 - Y-direction fixing screw; 34 - Y-direction adjustment mounting threaded hole; 35 - mounting cylinder; 36 - Z-direction fixed mounting threaded hole; 37 - connecting threaded hole; 51 - Z-direction compression spring; 52 - mounting external thread; 61 - Z-direction adjustment screw; 62 - cylindrical cavity; 63 - Z-direction adjustment mounting threaded hole; 64 - fixing screw mounting through hole; 65 - top fixing screw; 71 - Z-direction mounting kidney-shaped hole; 72 - Z-direction fixing screw; 73 - mounting ear; 74 - mounting through hole; 75 - top fixed mounting threaded hole; 76 - rectangular through cavity. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0040] As Figures 1 to 12 shown, the sub-reflector position adjustment structure of the dual-reflector antenna in this embodiment includes a sub-reflector 1. A rectangular boss 12 is provided on the sub-reflector 1. An X-direction adjustment plate 2 is sleeved on the rectangular boss 12. An X-direction adjustment screw 21 is connected to the X-direction adjustment plate 2, and the X-direction adjustment screw 21 contacts the rectangular boss 12. An upper portion of the X-direction adjustment plate 2 is sleeved with a Y-direction adjustment plate 3. A Y-direction adjustment screw 31 is connected to the Y-direction adjustment plate 3, and the Y-direction adjustment screw contacts the X-direction adjustment plate 2. An upper portion of the Y-direction adjustment plate 3 is provided with a mounting cylinder 35. The mounting cylinder 35 is connected to a fixing column 5. A fixing cylinder 6 is sleeved outside the fixing column 5. A Z-direction adjustment screw 61 is connected to the fixing cylinder 6, and the Z-direction adjustment screw 61 contacts the fixing column 5. A Z-direction adjustment plate 7 is connected to the fixing cylinder 6, and the Z-direction adjustment plate 7 is connected to one end of the support rod 8 of the antenna away from the main reflector 4.

[0041] An X-direction compression spring 13 is provided between the rectangular boss 12 and the X-direction adjustment plate 2. A Y-direction compression spring 22 is provided between the X-direction adjustment plate 2 and the Y-direction adjustment plate 3. A Z-direction compression spring 51 is provided between the fixing column 5 and the Z-direction adjustment plate 7.

[0042] An X-direction mounting waist-shaped hole 23 is provided on the X-direction adjustment plate 2. An X-direction fixing screw 24 connected to the sub-reflector 1 is provided in the X-direction mounting waist-shaped hole 23. A Y-direction mounting waist-shaped hole 32 is provided on the Y-direction adjustment plate 3. A Y-direction fixing screw 33 connected to the X-direction adjustment plate 2 is provided in the Y-direction mounting waist-shaped hole 32. The Z-direction adjustment plate 7 is sleeved on an upper portion of the Y-direction adjustment plate 3. A Z-direction mounting waist-shaped hole 71 is provided on the Z-direction adjustment plate 7. A Z-direction fixing screw 72 connected to the Y-direction adjustment plate 3 is provided in the Z-direction mounting waist-shaped hole 71.

[0043] Specifically, as Figure 5As shown in the figure, the sub-reflector 1 is composed of a reflector main body 11 and an upper rectangular boss 12. Four X-direction spring mounting holes 14 are provided on the rectangular boss 12, two on each side, symmetrically arranged, for mounting the X-direction compression spring 13. Four X-direction fixed mounting threaded holes 15 are provided on the back of the reflector main body 11, for fixing the X-direction adjustment plate 2.

[0044] As Figure 6 shown in the figure, two X-direction adjustment mounting threaded holes 25 are provided on the X-direction adjustment plate 2, one on each side, symmetrically arranged, for mounting the X-direction adjustment screw 21; four X-direction mounting waist-shaped holes 23 are provided, and their positions correspond to and match the four X-direction fixed mounting threaded holes 15 on the sub-reflector 1. Four Y-direction fixed mounting threaded holes 27 are provided on the X-direction adjustment plate 2; four Y-direction spring mounting holes 26 are provided, two on each side, symmetrically arranged, for mounting the Y-direction compression spring 22.

[0045] As Figure 7 shown in the figure, two Y-direction adjustment mounting threaded holes 34 are provided on the Y-direction adjustment plate 3, one in the front and one in the back, symmetrically arranged, for mounting the Y-direction adjustment screw 31; four Y-direction mounting waist-shaped holes 32 are provided, and their positions correspond to and match the four Y-direction fixed mounting threaded holes 27 on the X-direction adjustment plate 2. Four Z-direction fixed mounting threaded holes 36 are provided on the Y-direction adjustment plate 3. An installation cylinder 35 is provided on the top of the Y-direction adjustment plate 3, for mounting the Z-direction compression spring 51; a connecting threaded hole 37 is provided on the installation cylinder 35, for mounting the fixing column 5.

[0046] As Figure 8 shown in the figure, four Z-direction mounting waist-shaped holes 71 are provided on the Z-direction adjustment plate 7, and their positions correspond to and match the four Z-direction fixed mounting threaded holes 36 on the Y-direction adjustment plate 3. An installation through hole 74 is provided on the Z-direction adjustment plate 7 to facilitate the passing of the installation cylinder 35 on the Y-direction adjustment plate 3. Four top fixed mounting threaded holes 75 are provided on the Z-direction adjustment plate 7. Eight rectangular through cavities 76 are provided on the Z-direction adjustment plate 7 to avoid the operating tools for fastening the X-direction fixing screw 24 and the Y-direction fixing screw 33, and their positions correspond to and match the positions of the X-direction fixing screw 24 and the Y-direction fixing screw 33. Four installation lugs 73 are provided on the Z-direction adjustment plate 7, respectively located at the four corners of the Z-direction adjustment plate 7. The installation lugs 73 are connected to the support rod 8 of the antenna, for mounting and fixing the position adjustment structure of the sub-reflector 1.

[0047] As Figure 9 shown in the figure, an external mounting thread 52 is provided on the fixing column 5, which is used in cooperation with the connecting threaded hole 37 on the Y-direction adjustment plate 3 to mount and fix the Z-direction compression spring 51.

[0048] As Figure 10As shown in the figure, a cylindrical cavity 62 is provided on the fixed cylinder 6 to avoid the fixed column 5; one Z-direction adjustment installation threaded hole 63 is provided at its top for installing the Z-direction adjustment screw 61. Four fixed screw installation through holes 64 are provided at the lower flange of the fixed cylinder 6, and their positions correspond to the four top fixed installation threaded holes 75 on the Z-direction adjustment plate 7. After the top fixed screw 65 passes through the fixed screw installation through hole 64, it is threadedly connected to the top fixed installation threaded hole 75.

[0049] As Figure 3 and Figure 4 shown in the figure, in order to meet the position adjustment requirements of the secondary reflector 1, when each component is in the theoretical position, it is necessary to ensure that W2 = W1 + δ + δ (where W1 is the width of the rectangular boss 12 on the secondary reflector 11 in the X direction, δ is the maximum adjustment distance in a single direction, and W2 is the width of the cavity on the X-direction adjustment plate 2 in the X direction). Ensure that W4 = W3 + δ + δ (where W3 is the width of the boss on the X-direction adjustment plate 2 in the Y direction, and W4 is the width of the cavity on the Y-direction adjustment plate 3 in the Y direction). The distance between the top surface of the fixed column 5 and the top surface of the cylindrical cavity 62 on the fixed cylinder 6 is not less than δ to meet the Z-direction adjustment requirements. As Figure 11 shown in the figure, the length L of all the aforementioned waist-shaped holes = δ + δ (where L is the distance between the centers of the two arcs of the waist-shaped hole.

[0050] After the antenna is assembled, the offset distances ΔX, ΔY, and ΔZ of the secondary reflector 1 in the radial direction (X direction and Y direction) and the axial direction (Z direction) are obtained through testing first, and then the adjustments are made respectively in the following manner.

[0051] The X-direction adjustment process is as follows: First, loosen the X-direction fixed screws 24 (a total of 4 pieces) on the X-direction adjustment plate 2, and then rotate the X-direction adjustment screws 21 (1 piece on each side, a total of 2 pieces) on the X-direction adjustment plate 2 to overcome the resistance of the X-direction compression springs 13 (2 pieces on each side, a total of 4 pieces), and push the secondary reflector 1 to move in the positive or negative X direction by ΔX. Subsequently, tighten the X-direction fixed screws 24 on the X-direction adjustment plate 2 to complete the X-direction adjustment.

[0052] The Y-direction adjustment process is as follows: First, loosen the Y-direction fixed screws 33 (a total of 4 pieces) on the Y-direction adjustment plate 3, and then rotate the Y-direction adjustment screws 31 (1 piece in the front and back, a total of 2 pieces) on the Y-direction adjustment plate 3 to overcome the resistance of the Y-direction compression springs 22 (2 pieces in the front and back, a total of 4 pieces), and push the X-direction adjustment plate 2 (at this time, the secondary reflector 1 and the X-direction adjustment plate 2 are fixedly connected together) to move in the positive or negative Y direction by ΔY. Subsequently, tighten the Y-direction fixed screws 33 on the Y-direction adjustment plate 3 to complete the Y-direction adjustment.

[0053] The Z - direction adjustment process is as follows: First, loosen the Z - direction fixing screws 72 (1 piece for each of the front, back, left, and right, a total of 4 pieces) on the Z - direction adjustment plate 7; if it is necessary to adjust in the negative Z - direction, rotate the Z - direction adjustment screw 61 (1 piece in total) on the fixing cylinder 6 clockwise, overcome the resistance of the Z - direction compression spring 51 (1 piece in total), and push the fixing column 5 (at this time, the sub - reflector 1 is fixedly connected to the X - direction adjustment plate 2, the Y - direction adjustment plate 3, and the fixing column 5) to move ΔZ in the negative Z - direction. Then, tighten the Z - direction fixing screws 72 to complete the negative Z - direction adjustment; if it is necessary to adjust in the positive Z - direction, rotate the Z - direction adjustment screw 61 (1 piece in total) on the fixing cylinder 6 counterclockwise, and the fixing column 5 (at this time, the sub - reflector 1 is fixedly connected to the X - direction adjustment plate 2, the Y - direction adjustment plate 3, and the fixing column 5) moves ΔZ in the positive Z - direction under the resilience of the Z - direction compression spring 51. Then, tighten the Z - direction fixing screws 72 to complete the positive Z - direction adjustment.

[0054] A certain dual - reflector antenna adopting the sub - reflector 1 position adjustment structure proposed by the present invention is as Figure 12 shown. The dual - reflector antenna includes a main reflector 4, a feed 9 is installed in the middle of the main reflector 4, and 4 support rods 8 are connected between the main reflector 4 and the sub - reflector 1 position adjustment structure.

[0055] After the antenna assembly is completed, first obtain the offset values of the sub - reflector 1 in the X, Y, and Z directions through testing, and then complete the position adjustment of the sub - reflector 1 according to the foregoing method. After the adjustment is completed, the electromagnetic performance of the antenna is tested. The electromagnetic performance test results show that all electromagnetic performance indicators of this dual - reflector antenna meet the design requirements.

[0056] The present invention is not limited to the above - mentioned optional embodiments. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A position adjustment structure for the sub-reflector of a dual-reflector antenna, characterized in that: It includes a sub-reflector (1), on which a rectangular boss (12) is provided. An X-direction adjustment plate (2) is sleeved on the rectangular boss (12), and an X-direction adjustment screw (21) is connected to the X-direction adjustment plate (2), and the X-direction adjustment screw (21) contacts the rectangular boss (12); an upper part of the X-direction adjustment plate (2) is sleeved with a Y-direction adjustment plate (3), and a Y-direction adjustment screw (31) is connected to the Y-direction adjustment plate (3), and the Y-direction adjustment screw contacts the X-direction adjustment plate (2); an upper part of the Y-direction adjustment plate (3) is provided with a mounting cylinder (35), the mounting cylinder (35) is connected with a fixing column (5), a fixing cylinder (6) is sleeved outside the fixing column (5), and a Z-direction adjustment screw (61) is connected to the fixing cylinder (6), and the Z-direction adjustment screw (61) contacts the fixing column (5); a Z-direction adjustment plate (7) is connected to the fixing cylinder (6), and the Z-direction adjustment plate (7) is connected to one end of a support rod (8) of the antenna away from the main reflector (4); a Z-direction compression spring (51) is arranged between the fixing column (5) and the Z-direction adjustment plate (7).

2. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 1, characterized in that: An X-direction compression spring (13) is arranged between the rectangular boss (12) and the X-direction adjustment plate (2), and a Y-direction compression spring (22) is arranged between the X-direction adjustment plate (2) and the Y-direction adjustment plate (3).

3. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 2, characterized in that: A mounting through hole (74) is arranged in the middle of the Z-direction adjustment plate (7), the mounting cylinder (35) passes through the mounting through hole (74), and the Z-direction compression spring (51) is sleeved on the mounting cylinder (35).

4. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 1, characterized in that: An X-direction mounting waist-shaped hole (23) is arranged on the X-direction adjustment plate (2), and an X-direction fixing screw (24) connected to the sub-reflector (1) is arranged in the X-direction mounting waist-shaped hole (23); a Y-direction mounting waist-shaped hole (32) is arranged on the Y-direction adjustment plate (3), and a Y-direction fixing screw (33) connected to the X-direction adjustment plate (2) is arranged in the Y-direction mounting waist-shaped hole (32); the Z-direction adjustment plate (7) is sleeved on an upper part of the Y-direction adjustment plate (3), and a Z-direction mounting waist-shaped hole (71) is arranged on the Z-direction adjustment plate (7), and a Z-direction fixing screw (72) connected to the Y-direction adjustment plate (3) is arranged in the Z-direction mounting waist-shaped hole (71).

5. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 4, characterized in that: A plurality of rectangular through cavities (76) are arranged on the Z-direction adjustment plate (7), and the positions of the plurality of rectangular through cavities (76) correspond to the X-direction fixing screw (24) and the Y-direction fixing screw (33) respectively.

6. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 4, characterized in that: When each component is in the theoretical position, W2 = W1 + δ + δ, where W1 is the width of the rectangular boss (12) on the sub-reflector (1) in the X direction, δ is the maximum adjustment distance in a single direction, and W2 is the width of the concave cavity on the X-direction adjustment plate (2) in the X direction; W4 = W3 + δ + δ, where W3 is the width of the upper part of the X-direction adjustment plate (2) in the Y direction, and W4 is the width of the concave cavity on the Y-direction adjustment plate (3) in the Y direction; the distance between the top surface of the fixing column (5) and the top surface of the cylindrical concave cavity (62) on the fixing cylinder (6) is not less than δ.

7. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 6, characterized in that: The lengths L of the X-direction mounting waist-shaped hole (23), the Y-direction mounting waist-shaped hole (32) and the Z-direction mounting waist-shaped hole (71) are L = δ + δ, where L is the distance between the centers of the two arcs of the waist-shaped hole.

8. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 1, characterized in that: Mounting lugs (73) are provided at four corners of the Z-direction adjustment plate (7), and the Z-direction adjustment plate (7) is connected to the support rod (8) through the mounting lugs (73).

9. The position adjustment structure of the sub-reflector of a dual-reflector antenna according to claim 1, characterized in that: The fixed cylinder (6) and the Z-direction adjustment plate (7) are fixed by fastening screws.

10. A method for adjusting the position of the sub-reflector of a dual-reflector antenna, using the structure for adjusting the position of the sub-reflector of a dual-reflector antenna described in claim 1, characterized in that: It includes the following steps: X-direction adjustment process: Rotate the X-direction adjustment screw (21) on the X-direction adjustment plate (2) to push the secondary reflector (1) to move in the positive or negative X direction by ΔX; Y-direction adjustment process: Rotate the Y-direction adjustment screw (31) on the Y-direction adjustment plate (3) to push the X-direction adjustment plate (2) to move in the positive or negative Y direction by ΔY; Z-direction adjustment process: If it is necessary to adjust in the negative Z direction, rotate the adjustment screw on the fixed cylinder (6) clockwise to push the fixed column (5) to move in the negative Z direction by ΔZ; if it is necessary to adjust in the positive Z direction, rotate the adjustment screw on the fixed cylinder (6) counterclockwise, and the fixed column (5) moves in the positive Z direction by ΔZ under the resilience of the Z-direction compression spring (51).

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