Orthogonal dual-polarization metal slot antenna substructure, manufacturing method thereof and array antenna

Abstract

The invention discloses an orthogonal dual-polarization metal slot antenna substructure and a manufacturing method thereof, and an array antenna, and the substructure comprises a first horizontal antenna unit half-radiation sheet, a second horizontal antenna unit half-radiation sheet, a first vertical antenna unit half-radiation sheet, and a second vertical antenna unit half-radiation sheet. The first horizontal antenna unit half-radiation sheet, the second horizontal antenna unit half-radiation sheet, the first vertical antenna unit half-radiation sheet and the second vertical antenna unit half-radiation sheet are of a cross-shaped integrally-formed structure. The outer edges of the first horizontal antenna unit half-radiation sheet, the second horizontal antenna unit half-radiation sheet, the first vertical antenna unit half-radiation sheet and the second vertical antenna unit half-radiation sheet are of arc-shaped structures; the non-electromagnetic sensitive area of each half radiation sheet in the orthogonal dual-polarization metal slot antenna substructure is provided with a plurality of weight reduction cavities. Therefore, the problems of structural design and manufacturing of some high-frequency-band, small-size and high-performance orthogonal dual-polarization metal slot array antennas are solved.

Description

Technical Field

[0001] This application belongs to the field of antenna structure technology, and particularly relates to an orthogonal dual-polarized metal slot antenna substructure and array antenna. Background Technology

[0002] Orthogonal dual-polarized metallic slot array antennas possess advantages such as wide operating frequency band, high gain, large power capacity, and the ability to automatically match targets with different polarization characteristics, and are currently widely used. As is well known, an antenna is a typical mechatronic product; each component in an antenna is both a structural component and an electrical component, closely related to the antenna's electromagnetic performance. Therefore, the antenna's structural form and the detailed structural design and manufacturing methods of its components not only determine the antenna's electromagnetic performance and mechanical strength but also affect its manufacturing cost and cycle time.

[0003] Antenna elements of common orthogonal dual-polarized metallic slot array antennas, such as Figure 1 As shown, it consists of a metal base plate, a metal radiating plate (composed of two parts, left and right, separated by an air gap, through which electromagnetic waves radiate outwards), and electrical connectors. Each antenna element has independent electromagnetic performance specifications, which are the foundation for the electromagnetic performance of this array antenna. The array antenna is composed of antenna elements arranged and combined according to certain rules.

[0004] The most common structural forms and manufacturing methods for orthogonal dual-polarized metal slot array antennas are integral welding and component assembly. Integral welding refers to welding the metal base plate and radiating plates of the antenna elements into a single unit. The high temperatures during welding can cause antenna deformation, leading to a decrease in electromagnetic performance. Furthermore, the aluminum alloys suitable for welding are generally low- to medium-strength aluminum, resulting in antennas with lower mechanical strength and limited applications. Component assembly involves using connecting brackets and screws to secure the metal base plate and radiating plates to form the array antenna. This type of antenna requires numerous components and screws unrelated to electromagnetic performance, significantly increasing weight and manufacturing cost. Additionally, this type of antenna also has lower structural strength and limited applications.

[0005] The published patent, "Orthogonal Dual-Polarized Metal Slot Array Antenna Structure and Array Antenna Containing This Structure" (ZL201910271033.2), proposes a new structural form of an array antenna composed of interlocking sub-structural units consisting of horizontal and vertical radiating elements. This structure solves the problems associated with integral welding and component assembly. However, this structure requires a relatively large space for the radiating elements to accommodate the fixing screws at the interlocking points. Furthermore, gaps inevitably exist at the interlocking slots on the radiating elements, reducing the antenna's mechanical strength and negatively impacting the performance of certain high-frequency, high-precision antennas. Therefore, the existing structure is not suitable for certain high-frequency, small-size, high-performance orthogonal dual-polarized metal slot array antennas.

[0006] In summary, among the existing structural forms and manufacturing methods of orthogonal dual-polarized metal slot array antennas, antennas formed by integral welding have large deformation, low precision, and low structural strength; antennas formed by assembling disassembled parts are heavy, costly, and have low structural strength; the method proposed in the patent "Orthogonal Dual-Polarized Metal Slot Array Antenna Structure and Array Antenna Containing This Structure" to form an array antenna by interlocking and inserting radiating unit pieces to form sub-structural units is not suitable for certain high-frequency small-size high-performance antennas. Summary of the Invention

[0007] The purpose of this application is to address the shortcomings of existing structural forms and manufacturing methods by proposing an orthogonal dual-polarized metal slot antenna substructure and array antenna, thereby solving the structural design and manufacturing problems faced by small-sized, high-performance orthogonal dual-polarized metal slot array antennas in certain high-frequency bands.

[0008] The objective of this application is achieved through the following technical solution: An orthogonal dual-polarized metal slot antenna substructure, wherein the orthogonal dual-polarized metal slot antenna substructure is an integrated structure, comprising: First horizontal antenna element half-radiator, second horizontal antenna element half-radiator, first vertical antenna element half-radiator, and second vertical antenna element half-radiator. The first horizontal antenna unit half-radiator, the second horizontal antenna unit half-radiator, the first vertical antenna unit half-radiator, and the second vertical antenna unit half-radiator are cross-shaped integral structures. The outer edges of the first horizontal antenna unit half-radiator, the second horizontal antenna unit half-radiator, the first vertical antenna unit half-radiator, and the second vertical antenna unit half-radiator are arc-shaped structures. Furthermore, each half-radiating plate in the orthogonal dual-polarized metal slot antenna substructure has several weight-reducing cavities in its non-electromagnetically sensitive region.

[0009] According to a preferred embodiment, the mounting surface of the orthogonal dual-polarized metal slot antenna substructure is provided with a rectangular positioning boss and four first threaded holes on the bottom side for assembling, positioning and fastening the orthogonal dual-polarized metal slot antenna substructure on the antenna base plate.

[0010] According to a preferred embodiment, the rectangular positioning boss and the orthogonal dual-polarized metal slot antenna substructure are an integral structure.

[0011] According to a preferred embodiment, feed holes are provided at the horizontal and vertical feed points of the orthogonal dual-polarized metal slot antenna substructure for antenna feeding. The inner conductor of the antenna connector is inserted into the feed hole and contacts the hole wall to achieve feeding.

[0012] According to a preferred embodiment, a second threaded hole is provided on the side of the antenna half-radiator perpendicular to the feed hole axis for installing a set screw. The set screw presses the inner conductor of the electrical connector into the feed hole to achieve reliable power supply.

[0013] According to a preferred embodiment, the set screw is a headless, fully threaded structure with a slotted top to facilitate tool tightening.

[0014] According to a preferred embodiment, the antenna base plate is provided with a rectangular positioning cavity and four first holes. The positions of the rectangular positioning cavity and the four first holes are matched and correspond to the rectangular positioning boss and the first threaded hole on the orthogonal dual-polarized metal slot antenna substructure, which are used for the assembly positioning and fixation of the orthogonal dual-polarized metal slot antenna substructure.

[0015] According to a preferred embodiment, the antenna base plate is provided with two electrical connector mounting holes. The positions of the two electrical connector mounting holes are matched and aligned with the positions of the feed holes for horizontal and vertical feeding on the orthogonal dual-polarized metal slot antenna substructure. In addition, two second holes are provided next to each electrical connector mounting hole for installing second screws to fix the electrical connector. On the other hand, this application also discloses: A method for manufacturing an orthogonal dual-polarized metal slot antenna substructure, the method comprising: Step 1: Identify the orthogonal dual-polarized metal slot antenna substructure based on electromagnetic sensitivity and installation importance. Identify the electromagnetically sensitive areas as the four arc-shaped surfaces that form the air slots, namely the outer edges of the first horizontal antenna element half-radiator, the second horizontal antenna element half-radiator, the first vertical antenna element half-radiator, and the second vertical antenna element half-radiator. The installation importance areas are the mounting surface and rectangular positioning boss at the bottom of the orthogonal dual-polarized metal slot antenna substructure. Machining allowances are reserved in these two areas, and all threaded holes and feed holes are filled. The overall precision casting design is completed through process reconstruction. Step 2: Use precision casting to obtain the precision casting part after process reconstruction, namely the semi-finished orthogonal dual-polarized metal slot antenna substructure; Step 3: Perform local machining on the semi-finished orthogonal dual-polarized metal slot antenna substructure. Complete the machining of the four arc surfaces, the bottom mounting surface, the rectangular positioning boss, the two feed holes, and all threaded holes of the orthogonal dual-polarized metal slot antenna substructure. Ensure the dimensional accuracy and surface quality of the corresponding areas through machining to ensure the high electromagnetic performance of the antenna.

[0016] On the other hand, this application also discloses: An array antenna, wherein the array size of the array antenna is M×N, comprises: M×N horizontal polarization units and M×N vertical polarization units; An array antenna is constructed by setting (M+1)×(N+1)-1 orthogonal dual-polarized metal slot antenna substructures on the antenna base plate.

[0017] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0018] The beneficial effects of this application are: (1) The integral molded substructure proposed in this application is simple and reliable. It not only completely eliminates the gaps between the radiating plates of each antenna element, but also does not contain any unnecessary brackets and fixing screws. While ensuring the electromagnetic performance of the antenna, it reduces the weight of the antenna and improves the rigidity of the antenna.

[0019] (2) The novel structure proposed in this application, which uses a set screw to press the inner conductor of the electrical connector into the feed hole to achieve power feeding, can ensure that the antenna can work reliably under severe vibration or extreme temperature environment, and improve the environmental adaptability of the antenna in actual use.

[0020] (3) Regarding the aforementioned antenna substructure, the combined manufacturing method proposed in this application, which combines the advantages of precision casting and machining, ensures high shape and size accuracy and high surface quality in its electromagnetically sensitive area and important installation area, while significantly reducing its manufacturing cost and improving production efficiency.

[0021] (4) The substructure and manufacturing method proposed in this application are not limited by the number of antenna elements and the arraying method of the array antenna. They can realize any number of antenna elements and any arrangement of arrays, and are particularly suitable for large-scale arrays.

[0022] (5) The substructure and manufacturing method proposed in this application effectively solve the structural design and manufacturing problem of high-frequency small-size high-performance orthogonal dual-polarized metal slot array antennas. It can also be used in the large-scale antenna element array and mass production of low-frequency large-size orthogonal dual-polarized metal slot array antennas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the antenna element of an orthogonal dual-polarized metal slot array antenna; Figure 2 This is an axial top view of the orthogonal dual-polarized metal slot antenna substructure of this application; Figure 3 This is an axial top view of the orthogonal dual-polarized metal slot antenna substructure of this application; Figure 4 This is a schematic diagram of the orthogonal dual-polarized metal slot antenna substructure of this application installed in the array antenna; Figure 5 This is an exploded view of the orthogonal dual-polarized metal slot antenna substructure of this application installed in the array antenna; Figure 6 This is a cross-sectional view of the feed point in this application; Figure 7 This is a schematic diagram of the set screw structure; Figure 8 This is a schematic diagram of a precision casting part (semi-finished substructure) after process reconstruction; Figure 9 This is the isometric view of the array antenna in this application (64 elements for horizontal polarization + 64 elements for vertical polarization). Figure 10 This is a top view of the array antenna of this application (64 elements for horizontal polarization + 64 elements for vertical polarization). Among them, 1-substructure, 2-antenna base plate, 3-electrical connector, 4-set screw, 5-first screw, 6-second screw, 11-first horizontal antenna unit half-radiator, 12-second horizontal antenna unit half-radiator, 13-first vertical antenna unit half-radiator, 14-second vertical antenna unit half-radiator, 15-weight reduction cavity, 16-rectangular positioning boss, 17-first threaded hole, 18-feed hole, 19-second threaded hole, 21-rectangular positioning cavity, 22-first hole body, 23-electrical connector mounting hole, 24-second hole body, 101-arc surface, 102-mounting surface. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0030] Example 1 refer to Figures 2 to 7 As shown in the figure, an orthogonal dual-polarized metal slot antenna substructure 1 is illustrated. This orthogonal dual-polarized metal slot antenna substructure 1 is an integrated structure comprising: a first horizontal antenna element half-radiator 11, a second horizontal antenna element half-radiator 12, a first vertical antenna element half-radiator 13, and a second vertical antenna element half-radiator 14. The outer edges of the first horizontal antenna element half-radiator 11, the second horizontal antenna element half-radiator 12, the first vertical antenna element half-radiator 13, and the second vertical antenna element half-radiator 14 are arc-shaped structures, i.e., arc-shaped surfaces 101.

[0031] It should be noted that the orthogonal dual-polarized metal slot antenna substructure 1 is not an antenna element of the array antenna. Although it has an independent physical form, it does not have independent electromagnetic performance indicators. It is merely a structural assembly extracted for the engineering implementation of the entire array antenna (processing, assembly, mechanical structural strength, etc.), and does not have a one-to-one correspondence with the antenna elements in the array antenna. The background technology section also clearly describes antenna elements such as... Figure 1 As shown, it consists of a metal base plate, a metal radiating plate (composed of two parts, left and right, with an air gap in the middle, through which electromagnetic waves gradually radiate outwards), and an electrical connector.

[0032] Preferably, the first horizontal antenna unit half-radiator 11, the second horizontal antenna unit half-radiator 12, the first vertical antenna unit half-radiator 13, and the second vertical antenna unit half-radiator 14 are integrally formed in a cross shape. That is, this substructure is simple and reliable, not only completely eliminating the splicing gap between the horizontal and vertical radiating plates of the antenna unit, but also not containing any unnecessary brackets and fixing screws.

[0033] Furthermore, in the orthogonal dual-polarized metal slot antenna substructure 1, each half-radiating plate has several weight-reducing cavities 15 in its non-electromagnetically sensitive region. This achieves the goal of reducing the weight of the antenna.

[0034] Preferably, the mounting surface 102 of the orthogonal dual-polarized metal slot antenna substructure 1 is provided with a rectangular positioning boss 16 and four first threaded holes 17 on the bottom side, which are used for the assembly, positioning and fastening of the orthogonal dual-polarized metal slot antenna substructure 1 on the antenna base plate 2.

[0035] Furthermore, the rectangular positioning boss 16 and the orthogonal dual-polarized metal slot antenna substructure 1 are integrated into one structure. The rectangular positioning boss 16 and the substructure are integrated to improve machining and assembly positioning accuracy.

[0036] Preferably, feed holes 18 are provided at the horizontal and vertical feed points of the orthogonal dual-polarized metal slot antenna substructure 1 for antenna feeding. The inner conductor of the antenna electrical connector 3 is inserted into the feed hole 18 and contacts the hole wall to achieve feeding.

[0037] Furthermore, a second threaded hole 19 is provided on the side of the antenna half-radiator perpendicular to the axis of the feed hole 18 for installing a set screw 4. The set screw 4 presses the inner conductor of the electrical connector 3 into the feed hole 18 to ensure reliable power supply, thereby ensuring reliable antenna operation under vibration or temperature conditions. Figures 4-6 As shown.

[0038] Furthermore, the set screw 4 is a headless, fully threaded structure with a slotted top for easy tightening with tools. After installation, the set screw 4 has no protruding head, thus not affecting the antenna's electromagnetic performance, and is both aesthetically pleasing and practical. This innovative solution of using the set screw 4 to fix the inner conductor of the electrical connector is convenient, simple, and reliable, avoiding problems such as high-temperature deformation, operational difficulties, poor reliability, and low yield associated with traditional welding methods.

[0039] Preferably, the antenna base plate 2 is provided with a rectangular positioning cavity 21 and four first holes 22. The positions of the rectangular positioning cavity 21 and the four first holes 22 are matched and correspond to the rectangular positioning boss 16 and the first threaded hole 17 on the orthogonal dual-polarized metal slot antenna substructure 1, and are used for the assembly, positioning and fixing of the orthogonal dual-polarized metal slot antenna substructure 1.

[0040] The antenna base plate 2 is provided with two electrical connector 3 mounting holes. The positions of the two electrical connector 3 mounting holes are matched and aligned with the positions of the feed holes 18 on the orthogonal dual-polarized metal slot antenna substructure 1 for horizontal and vertical feeding. In addition, two second holes 24 are provided next to each electrical connector 3 mounting hole for installing second screws 6 to fix the electrical connector 3. The integral molded substructure proposed in this application is simple and reliable. It not only completely eliminates the gaps between the radiating plates of each antenna element, but also eliminates any unnecessary supports and fixing screws. While ensuring the electromagnetic performance of the antenna, it reduces the antenna weight and improves the antenna's rigidity. The novel structure proposed in this application, which uses set screws to press the inner conductor of the electrical connector into the feed hole to achieve feeding, ensures reliable operation of the antenna under severe vibration or extreme temperature environments, improving the antenna's environmental adaptability in practical use.

[0041] Example 2 Example 1: Common manufacturing methods for substructure parts include machining and integral precision casting. Machining uses solid blanks as raw materials, removing excess material to obtain the part. This method offers high dimensional accuracy and good surface quality, but it suffers from low material utilization, large processing volume, high cost for mass production, and a long manufacturing cycle. Integral precision casting involves precisely pouring molten metal into a pre-prepared mold, allowing it to cool and solidify to form the desired shape. This method boasts high material utilization and production efficiency, but the resulting parts generally have lower dimensional accuracy and surface quality compared to machining.

[0042] Based on Embodiment 1, this embodiment also discloses a manufacturing method for an orthogonal dual-polarized metal slot antenna substructure 1. Specifically, it is a combined manufacturing method of overall precision casting followed by local machining, which takes into account the advantages of precision casting and machining. While ensuring high shape and size accuracy and high surface quality of the electromagnetically sensitive area of ​​the complex antenna component, the substructure, it significantly reduces its manufacturing cost and improves production efficiency, thereby achieving high electromagnetic performance indicators for the antenna.

[0043] The manufacturing method includes the following steps.

[0044] Step 1: The orthogonal dual-polarized metal slot antenna substructure 1 is identified based on electromagnetic susceptibility and installation importance. The electromagnetically sensitive areas are identified as the four arc-shaped surfaces 101 forming the air slots, namely the outer edges of the first horizontal antenna element half-radiator 11, the second horizontal antenna element half-radiator 12, the first vertical antenna element half-radiator 13, and the second vertical antenna element half-radiator 14. The installation importance areas are the mounting surface 102 and the rectangular positioning boss 16 at the bottom of the orthogonal dual-polarized metal slot antenna substructure 1. Machining allowances are reserved in these two areas, and all threaded holes and feed holes 18 are filled. The overall precision casting design is completed through process reconstruction. (For example...) Figure 8 As shown in the figure. The shaded area in the figure represents the machining allowance.

[0045] Step 2: Use precision casting to obtain the precision casting part after process reconstruction, namely the semi-finished orthogonal dual-polarized metal slot antenna substructure 1.

[0046] Step 3: Perform partial machining on the semi-finished orthogonal dual-polarized metal slot antenna substructure 1, completing the machining of the four arc surfaces 101, the bottom mounting surface 102, the rectangular positioning boss 16, the two feed holes 18, and all threaded holes of the orthogonal dual-polarized metal slot antenna substructure 1. Ensure the dimensional accuracy and surface quality of the corresponding areas through machining to ensure the high electromagnetic performance of the antenna.

[0047] The combined manufacturing method proposed in this application, which involves overall precision casting followed by local machining, combines the advantages of both precision casting and machining. While ensuring high dimensional accuracy and high surface quality in electromagnetically sensitive areas and important installation areas, it significantly reduces manufacturing costs and improves production efficiency.

[0048] The substructure and manufacturing method proposed in this application are not limited by the number of antenna elements and the array arrangement of the array antenna. They can realize any number of antenna elements and any arrangement of arrays, and are particularly suitable for large-scale arrays.

[0049] The substructure and manufacturing method proposed in this application effectively solve the structural design and manufacturing problems of high-frequency band small-size high-performance orthogonal dual-polarized metal slot array antennas. It can also be used in low-frequency band large-size orthogonal dual-polarized metal slot array antennas for large-scale antenna element arrays and mass production.

[0050] Example 3 Based on Embodiment 1, this embodiment also discloses: an array antenna, wherein the array size of the array antenna is M×N, comprising: M×N horizontal polarization units and M×N vertical polarization units. If the array antenna is designed according to the substructure proposed in this application, the number of substructures is (M+1)×(N+1)-1.

[0051] For example, a high-frequency orthogonal dual-polarized metal slot array antenna has an array size of 8×8 (M=8, N=8), that is, 64 horizontally polarized elements and 64 vertically polarized elements, with an element spacing of 19.8mm. The final array antenna is designed and manufactured according to the substructure proposed in this application, as shown below. Figure 9 and Figure 10 As shown, it comprises 80 substructures, corresponding to 64 horizontally polarized antenna elements and 64 vertically polarized antenna elements. All of these antenna elements are located in... Figure 10The dashed box shown represents the virtual elements of the array antenna, used to improve the radiation pattern of the edge antenna elements, thereby increasing the overall radiation efficiency of the array antenna. In this example, the antenna base is a frame structure, with 80 substructures mounted on the top surface of the frame. Several electronic modules and printed circuit boards are installed inside the frame, and high-frequency and low-frequency connectors (the external electrical interfaces of the array antenna) are mounted on the sides of the frame. This array antenna has a simple and reliable structure, is lightweight, high-strength, and has good manufacturability, and is already in mass production. Physical testing has shown that all electromagnetic performance indicators of the array antenna meet the design requirements, with a 100% product qualification rate.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An orthogonal dual-polarized metal slot antenna substructure, characterized in that, The orthogonal dual-polarized metal slot antenna substructure is an integrated structure, comprising: The first horizontal antenna unit half-radiator (11), the second horizontal antenna unit half-radiator (12), the first vertical antenna unit half-radiator (13), and the second vertical antenna unit half-radiator (14). The first horizontal antenna unit half-radiator (11), the second horizontal antenna unit half-radiator (12), the first vertical antenna unit half-radiator (13), and the second vertical antenna unit half-radiator (14) are cross-shaped integral structures. The outer edges of the first horizontal antenna unit half-radiator (11), the second horizontal antenna unit half-radiator (12), the first vertical antenna unit half-radiator (13), and the second vertical antenna unit half-radiator (14) are arc-shaped structures. Furthermore, each half-radiating plate in the orthogonal dual-polarized metal slot antenna substructure has several weight-reducing cavities (15) in its non-electromagnetically sensitive region.

2. The orthogonal dual-polarized metal slot antenna substructure as described in claim 1, characterized in that, The mounting surface (102) of the orthogonal dual-polarized metal slot antenna substructure is provided with a rectangular positioning boss (16) and four first threaded holes (17) on the bottom side, which are used for the assembly, positioning and fastening of the orthogonal dual-polarized metal slot antenna substructure on the antenna base plate (2).

3. The orthogonal dual-polarized metal slot antenna substructure as described in claim 2, characterized in that, The rectangular positioning boss (16) and the orthogonal dual-polarized metal slot antenna substructure are an integral structure.

4. The orthogonal dual-polarized metal slot antenna substructure as described in claim 2, characterized in that, Feed holes (18) are provided at the horizontal and vertical feed points of the orthogonal dual-polarized metal slot antenna substructure for antenna feeding. The inner conductor of the antenna connector is inserted into the feed hole (18) and contacts the hole wall to achieve feeding.

5. The orthogonal dual-polarized metal slot antenna substructure as described in claim 4, characterized in that, A second threaded hole (19) is provided on the side of the antenna half-radiator perpendicular to the axis of the feed hole (18) for installing a set screw (4). The inner conductor of the electrical connector is pressed into the feed hole (18) by the set screw (4) to achieve reliable power supply.

6. The orthogonal dual-polarized metal slot antenna substructure as described in claim 5, characterized in that, The set screw (4) is a headless, fully threaded structure with a slotted top for easy tightening with tools.

7. The orthogonal dual-polarized metal slot antenna substructure as described in claim 3, characterized in that, The antenna base plate (2) is provided with a rectangular positioning cavity (21) and four first holes (22). The positions of the rectangular positioning cavity (21) and the four first holes (22) are matched and correspond to the rectangular positioning boss (16) and the first threaded hole (17) on the orthogonal dual-polarized metal slot antenna substructure, and are used for the assembly positioning and fixation of the orthogonal dual-polarized metal slot antenna substructure.

8. The orthogonal dual-polarized metal slot antenna substructure as described in claim 5, characterized in that, The antenna base plate (2) is provided with two electrical connector mounting holes (23). The positions of the two electrical connector mounting holes (23) are matched and aligned with the positions of the feed holes (18) used for horizontal and vertical feeding on the orthogonal dual-polarized metal slot antenna substructure. In addition, two second holes (24) are provided next to each electrical connector mounting hole (23) for installing second screws (6) to fix the electrical connector.

9. A method for manufacturing an orthogonal dual-polarized metal slot antenna substructure as described in any one of claims 1 to 8, characterized in that, The manufacturing method includes: Step 1: The orthogonal dual-polarized metal slot antenna substructure is identified based on electromagnetic sensitivity and installation importance. The electromagnetic sensitive areas are identified as the four arc-shaped surfaces (101) that form the air slots, namely the outer edges of the first horizontal antenna unit half-radiator (11), the second horizontal antenna unit half-radiator (12), the first vertical antenna unit half-radiator (13), and the second vertical antenna unit half-radiator (14). The installation important areas are the mounting surface (102) and the rectangular positioning boss (16) at the bottom of the orthogonal dual-polarized metal slot antenna substructure. Machining allowances are reserved in these two areas, and all threaded holes and feed holes are filled. The overall precision casting design is completed through process reconstruction. Step 2: Use precision casting to obtain the precision casting part after process reconstruction, namely the semi-finished orthogonal dual-polarized metal slot antenna substructure; Step 3: Perform local machining on the semi-finished orthogonal dual-polarized metal slot antenna substructure, complete the machining of the four arc surfaces (101), the bottom mounting surface (102), the rectangular positioning boss (16), the two feed holes (18), and all threaded holes of the orthogonal dual-polarized metal slot antenna substructure, and ensure the dimensional accuracy and surface quality of the corresponding areas through machining, so as to ensure the high electromagnetic performance index of the antenna.

10. An array antenna, characterized in that, The array size of the array antenna is M×N, which includes: M×N horizontal polarization units and M×N vertical polarization units. An array antenna is formed by setting (M+1)×(N+1)-1 orthogonal dual-polarized metal slot antenna substructures as described in any one of claims 1 to 7 on the antenna base plate (2).

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