An oblique polarization radome and its forming method

Abstract

The present invention provides an inclined polarization radome and a forming method, relating to the technical field of radomes. The present invention provides an inclined polarization radome, which includes: an inner skin, a copper tape-covered foam board, an outer skin, and a film layer; the inner skin, the copper tape-covered foam board, and the outer skin are adhered through the film layer; the copper tape-covered foam board is a foam board with a plurality of equidistantly arranged copper tapes paved on the surface, and any single copper tape is a continuous copper tape; wherein, the copper tapes on the same surface of the foam board serve as the same layer of polarization grids, and a single copper tape serves as a polarization grid bar. Based on the technical solution of the present invention, the polarization grid bars are made of continuous copper tapes, avoiding potential hazards such as block division, splicing, and break point connection in the polarization grid bars, improving the structural reliability of the large-sized inclined polarization radome and the performance of the antenna system; through the design of removing the dielectric layer, without a substrate, reducing the number of bonding layers, and decreasing the dielectric loss value, the number of delamination layers, and the complexity of the forming process of the large-sized inclined polarization radome.

Description

Technical Field

[0001] The present invention relates to the field of radomes, and particularly to an obliquely polarized radome and a forming method thereof. Background Art

[0002] In electronic information systems such as radar and countermeasure, the antenna is restricted by the physical space, and there is a situation where the antenna cannot be directly designed as obliquely polarized. Therefore, an obliquely polarized radome is often used to generate the effect of polarization rotation on the incident electromagnetic wave, twist the vertical polarization of the antenna into obliquely polarized, thereby greatly reducing the weight and volume of the antenna and optimizing the physical layout of the antenna.

[0003] Currently, the polarization grating layer of the obliquely polarized radome is generally etched with the required polarization grating pattern on a microstrip board or a printed board, and then connected to a filling layer, a skin layer, etc. With the continuous improvement of the requirements for integration and mobility of electronic information systems, the application scenarios of obliquely polarized radomes are also increasing. However, limited by the maximum outer dimension of the substrate, the outer shape of the radome is generally within 600mm×600mm. Beyond this range, multiple substrates need to be spliced. Correspondingly, a large number of splicing power breaks will occur in the polarization grating, and a soldering method needs to be adopted to ensure the electrical continuity of the polarization grating, resulting in potential cracking and short-circuit hazards during the use of large-sized obliquely polarized radomes.

[0004] Therefore, there is an urgent need for a large-sized obliquely polarized radome to solve the above problems. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides an obliquely polarized radome and a forming method thereof to solve the technical problem of cracking and short-circuiting existing in the use of large-sized obliquely polarized radomes.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions:

[0009] In the first aspect of the present invention, an obliquely polarized radome is provided, and the obliquely polarized radome includes: an inner skin, a copper tape foam board, an outer skin, and a film layer;

[0010] The inner skin, the copper tape foam board, and the outer skin are adhered through the film layer;

[0011] The copper tape foam board is a foam board with a plurality of equally spaced copper tapes laid on the surface, and any single copper tape is a continuous copper tape;

[0012] Wherein, the copper tapes on the same surface of the foam board are used as the same layer of polarization grating, and the single copper tape is used as a polarization grating bar.

[0013] Optionally, the copper strip is made of T2Y, and the thickness of the copper strip is 0.05 mm - 0.12 mm.

[0014] Optionally, the foam board is made of polymethacrylimide closed-cell rigid hard foam, with a dielectric loss value less than 1.2 and a loss tangent value less than 0.004.

[0015] Optionally, the slant-polarized radome further includes an epoxy adhesive layer located between the copper strip and the foam board.

[0016] Optionally, in the copper-clad foam board, several copper strips arranged at equal distances are laid on one side or both sides of the foam board.

[0017] Optionally, the slant-polarized radome further includes a connecting embedded part that penetrates through multiple layers of copper-clad foam board.

[0018] Optionally, the materials of the inner skin and the outer skin include: a combination of glass fiber and epoxy resin, or a combination of quartz fiber and cyanate resin;

[0019] The material of the adhesive film layer includes: epoxy resin, or cyanate resin;

[0020] Among them, in the same slant-polarized radome, the materials of the inner skin and the outer skin are the same, and the resin type of the adhesive film layer is the same as that of the inner skin and the outer skin. The material of the adhesive film layer includes: epoxy resin, cyanate resin.

[0021] In the second aspect of the present invention, a forming method of a slant-polarized radome is provided, characterized in that the forming method includes: sequentially laying an outer skin, an adhesive film layer, a connecting embedded part, multiple layers of copper-clad foam board, an adhesive film layer, and an inner skin on a precision flat plate, and forming by vacuum-assisted curing;

[0022] Among them, the multiple layers of copper-clad foam board are adhered through an adhesive film layer.

[0023] Optionally, the forming method further includes:

[0024] The copper strip is evenly laid on the surface of the foam board pre-coated with an epoxy adhesive layer in a rolling and pasting manner in the guide groove of the positioning template.

[0025] Optionally, before the copper strip is evenly laid on the surface of the foam board pre-coated with an epoxy adhesive layer in a rolling and pasting manner in the guide groove of the positioning template, the forming method further includes:

[0026] By means of screen printing, a uniform epoxy adhesive layer is added to the surface of the foam board.

[0027] (III) Advantageous Effects

[0028] The present invention provides the following advantageous effects as compared with the prior art:

[0029] In the technical solution provided by the present invention, an inclined polarization radome includes: an inner skin, a copper-clad foam board, an outer skin, and a film layer; the inner skin, the copper-clad foam board, and the outer skin are adhered through the film layer; the copper-clad foam board is a foam board with a plurality of equally spaced copper strips laid on its surface, and any single copper strip is a continuous copper strip; wherein, the copper strips on the same surface of the foam board serve as the same layer of polarization grids, and a single copper strip serves as a polarization grid bar.

[0030] Based on the above technical solution, the polarization grid bars are made of continuous copper strips, avoiding potential problems such as block division, splicing, and break point connection in the polarization grid bars, effectively solving the problem of cracking and short circuit in the use of existing large-sized inclined polarization radomes, and improving the structural reliability of large-sized inclined polarization radomes and the performance of the antenna system; and through the design of removing the dielectric layer, that is, introducing a copper-clad foam board, a plurality of copper strips are fixed on the foam board at equal distances, and multiple copper-clad foam boards are combined to form multiple layers of polarization grids, without a substrate, reducing the number of bonding layers, thereby reducing the dielectric loss value, the number of delamination, and the complexity of the forming process of large-sized inclined polarization radomes, and further improving the process stability and environmental adaptability of large-sized inclined polarization radomes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0032] Figure 1 It is an overall view of a large-sized flat inclined polarization radome provided by an embodiment of the present invention;

[0033] Figure 2 is Figure 1 sectional view B-B in;

[0034] Figure 3 is Figure 2 an enlarged view of part A in;

[0035] Figure 4 It is a schematic structural view of a foam board support plate of a large-sized flat inclined polarization radome provided by an embodiment of the present invention;

[0036] Figure 5 is Figure 4 sectional view C-C in;

[0037] Figure 6 is Figure 3 the D-D cross-sectional view in;

[0038] Figure 7 is Figure 6 the enlarged view at D in;

[0039] Figure 8 is Figure 3 the E-E cross-sectional view in;

[0040] Figure 9 is Figure 8 the enlarged view at C in;

[0041] Figure 10 is Figure 3 the F-F cross-sectional view in;

[0042] Figure 11 is Figure 10 the enlarged view at B in;

[0043] Figure 12 is the structural schematic diagram of a positioning template provided by an embodiment of the present invention;

[0044] Figure 13 is the structural schematic diagram of a screen printing template provided by an embodiment of the present invention;

[0045] 1 - outer skin; 2 - adhesive film layer; 3 - single-sided copper-clad foam board; 4 - adhesive film layer; 5 - double-sided copper-clad foam board; 6 - adhesive film layer; 7 - inner skin; 8 - connecting embedded part; 31 - foam board; 32 - polarization grid; 51 - foam board; 52 - polarization grid; 53 - polarization grid; 9 - high-precision stainless steel mesh board; 10 - process frame. Specific embodiments

[0046] 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 are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0047] The embodiments of the present invention provide an inclined polarization radome and a forming method, effectively solving the problem of cracking and short-circuiting existing in the use of large-sized inclined polarization radomes, and improving the structural reliability of large-sized inclined polarization radomes and the performance of antenna systems.

[0048] The technical solutions in the embodiments of the present invention are generally as follows to achieve the above beneficial effects:

[0049] Currently, the forming method of etching the required polarization grating pattern on a microstrip board or printed circuit board has the following problems in high-power, multi-layer, and large-size application scenarios: There are potential risks of cracking and short-circuiting in the use of large-size oblique polarization radomes; large-size oblique polarization radomes have too many layers, the forming process is relatively complex, there is a risk of interlayer cracking during use, and the discreteness of the bonding interface is significantly increased, which is not conducive to the stability and consistency of the microwave performance of large-size oblique polarization radomes.

[0050] In response to the above problems, in the technical solution of the present invention, the dielectric loss value of the large-size oblique polarization radome is reduced by using a low-dielectric-loss medium or a de-medium layer design; through structural design, the integrity and continuity of the large-size oblique polarization radome are improved, splicing design is avoided, and an integral continuous polarization grating is adopted; in the process design, the number of bonding layers is reduced, the complexity of the forming process is reduced, and the process stability is improved.

[0051] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0052] In some embodiments, the oblique polarization radome includes: an inner skin, a copper-clad foam board, an outer skin, and an adhesive film layer; the inner skin, the copper-clad foam board, and the outer skin are adhered through the adhesive film layer; the copper-clad foam board is a foam board with a number of equally spaced copper strips laid on its surface, and any single copper strip is a continuous copper strip; wherein, the copper strips on the same surface of the foam board are used as the same layer of polarization grating, and a single copper strip is used as a polarization grating bar.

[0053] The equal-spacing arrangement of a number of copper strips means that these copper strips are parallelly distributed on the surface of the foam board. Among them, with the assistance of a tooling, the copper strips are directly positioned and fixed on the foam board. The specific number of copper strips is related to factors such as the size of the oblique polarization radome, the width of the copper strip, and the polarization requirements of the oblique polarization radome. The continuous copper strip means that the copper strip is integrally formed and has not undergone processes such as welding and splicing.

[0054] The oblique polarization radome usually includes multiple layers of parallel polarization gratings with a gradually changing polarization angle for each layer. The commonly used oblique polarization angle is 45°, and the number of layers of the polarization grating is mostly 3 layers or 5 layers. Among them, for the 3-layer polarization grating, the polarization angle of each layer of the polarization grating is: 0°, 22.5°, 45°; for the 5-layer polarization grating, the polarization angle of each layer of the polarization grating is 0°, 11.25°, 22.5°, 33.75°, 45°.

[0055] The spacing between the same-layer polarization gratings and the spacing between different-layer polarization gratings mainly affect the antenna pattern and polarization performance, and the width of the polarization grating mainly affects the standing wave ratio. Therefore, the above parameters can all be determined by telecommunication simulation design. The material of the polarization grating is generally a metal strip with good conductivity. Among them, the application range and polarization effect of the copper strip are both at the top.

[0056] Based on the above technical solution, the polarization grating bars are made of continuous copper strips, avoiding potential problems such as block segmentation, splicing, and break-point connection in the polarization grating bars, effectively solving the problem of cracking and short-circuiting existing in the use of large-sized oblique polarization radomes, improving the structural reliability of the large-sized oblique polarization radome and the performance of the antenna system; and through the design of removing the dielectric layer, that is, introducing copper-clad foam boards, fixing several copper strips on the foam board at equal distances, and combining multiple copper-clad foam boards to form a multi-layer polarization grating. Without a substrate, the number of bonding layers is reduced, thereby reducing the dielectric loss value, the number of delamination layers, and the complexity of the forming process of the large-sized oblique polarization radome, and further improving the process stability and environmental adaptability of the large-sized oblique polarization radome.

[0057] In some embodiments, the oblique polarization radome further includes a connecting embedded part, which penetrates through multiple layers of copper-clad foam boards. Among them, the connecting embedded part is made of an aluminum alloy rod, located between the adhesive film layer attached to the inner skin and the adhesive film layer attached to the outer skin, acting as a positioning pin during the process and playing a role in local strengthening and connection in the finished oblique polarization radome.

[0058] The technical solution of the present invention is applicable to oblique polarization radomes in the shapes of flat plates, cylinders, spheres, etc. The embodiments of the present invention are described by taking a flat-plate oblique polarization radome as an example.

[0059] See Figure 1 、 Figure 2 and Figure 3 wherein, Figure 1 is an overall view of a large-sized flat-plate oblique polarization radome provided by an embodiment of the present invention; Figure 2 is Figure 1 the sectional view taken along line B-B in Figure 3 is Figure 2 the enlarged view at position A in Figure 1 、 Figure 2 、 Figure 3 As shown in

[0060] In some embodiments, the material of the copper strip is T2Y, and the thickness is 0.05 mm - 0.12 mm.

[0061] In one implementation, the material of the polarization grating is pure copper strip T2Y. Among them, the thickness of the pure copper strip is 0.05 mm, and the width is 2 ± 0.05 mm. The pure copper strip is processed by a precision cutting machine to obtain the pure copper strip of the above dimensions, and the pure copper strip after the cutting process is supplied in a disc shape.

[0062] In some embodiments, the material of the foam board is polymethacrylimide (PMI) closed-cell rigid hard foam, the dielectric loss (ε) value is less than 1.2, and the loss tangent (tanδ) value is less than 0.004.

[0063] See Figure 4 and Figure 5 , among which, Figure 4 is a schematic structural diagram of a foam board support plate of a large-sized flat inclined polarization radome provided by an embodiment of the present invention; Figure 5 is Figure 4 the C-C sectional view in Figure 4 . As Figure 5 shown, the external dimensions of the foam support plates (31, 51) (i.e., the foam board of the present invention) are 1300 mm (length) × 1300 mm (width) × 10 mm (width).

[0064] Among them, the material of the foam support plate is polymethacrylimide (PMI) closed-cell rigid hard foam. The two sides of the thickness of the foam support plates (31, 51) are not processed, and the external shape and installation positioning holes around are formed by numerical control milling.

[0065] In some embodiments, the radome further includes an epoxy adhesive layer, and the epoxy adhesive layer is located between the copper strip and the foam board. Among them, the epoxy adhesive layer is used to fix the copper strip on the surface of the foam board.

[0066] In some embodiments, in the copper-clad foam board, several copper strips are arranged at equal intervals on one side or both sides of the foam board.

[0067] Among them, the prefabricated part of the copper-clad foam board is formed by vacuum-assisted curing.

[0068] See Figure 6 and Figure 7 , among which, Figure 6 is Figure 3 the D-D sectional view in Figure 7 is Figure 6 the enlarged view at D in Figure 6 . As Figure 7As shown, the single-sided copper-clad foam board (3) consists of a polarization grid (32) and a foam support board (31). Among them, the polarization grid (32) is formed by evenly laying 170 extremely thin pure copper strips, with the laying range being 1200 mm (length) × 1200 mm (width). The longest copper strip is 1689.2 mm, and the shortest is 6.2 mm. Among them, the spacing requirement of the polarization grid bars is 10.8 ± 0.1 mm, and the requirement for the angle between the polarization grid bars and the horizontal direction

[0069] See Figure 8 、 Figure 9 、 Figure 10 and Figure 11 wherein, Figure 8 is Figure 3 the E-E cross-sectional view in Figure 9 is Figure 8 the enlarged view at C in Figure 10 is Figure 3 the F-F cross-sectional view in Figure 11 is Figure 10 the enlarged view at B in Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, the double-sided copper-clad foam board (5) consists of 2 layers of polarization grids (52, 53) and a foam support board (51). The polarization grid (52) is formed by evenly laying 156 extremely thin pure copper strips, with the laying range being 1200 mm (length) × 1200 mm (width). The longest pure copper strip is 1299 mm, and the shortest is 31 mm. Among them, the grid bar spacing requirement is 10.8 ± 0.1 mm, and the requirement for the angle between the grid bars and the horizontal direction is 22.5° ± 0.1°. The polarization grid (53) is formed by evenly laying 126 extremely thin pure copper strips, with the laying range being 1200 mm (length) × 1200 mm (width), and the length of the pure copper strip is 1200 mm. Among them, the grid bar spacing requirement is 9.5 ± 0.1 mm.

[0070] In some embodiments, the materials of the inner skin and the outer skin include: a combination of glass fiber and epoxy resin, or a combination of quartz fiber and cyanate resin;

[0071] The material of the adhesive film layer includes: epoxy resin, or cyanate resin;

[0072] Among them, in the same obliquely polarized radome, the materials of the inner skin and the outer skin are the same, and the resin type of the adhesive film layer is the same as that of the inner skin and the outer skin.

[0073] In the above technical solution, the dielectric loss values of glass fiber, epoxy resin, quartz fiber and cyanate resin are all relatively low, thus effectively reducing the dielectric loss value of the formed obliquely polarized radome. In addition, since the dielectric loss values of glass fiber and epoxy resin are basically the same, the dielectric loss values of quartz fiber and cyanate resin are basically the same, and in the same obliquely polarized radome, the materials of the inner skin and the outer skin are the same, and the resin type of the adhesive film layer is the same as that of the inner skin and the outer skin, the dielectric loss values of the inner skin, the outer skin and each adhesive film layer in the same obliquely polarized radome are basically the same, thereby effectively improving the process stability of the formed obliquely polarized radome and the performance of the antenna system.

[0074] In one implementation, the inner skin and the outer skin generally adopt a combination of glass fiber and epoxy resin, or a combination of quartz fiber and cyanate resin. The main basis for material selection is telecommunication design and working temperature. The adhesive film layer generally adopts epoxy resin or cyanate resin, which is consistent with the resin types of the inner skin and the outer skin. As Figure 3 shown, the thicknesses of the inner skin (7) and the outer skin (1) are both 0.6 mm, and their materials are a combination of quartz fiber and cyanate resin, and the material of the adhesive film layer is correspondingly cyanate resin.

[0075] The embodiment of the present invention also provides a forming method for an obliquely polarized radome. The forming method includes: sequentially laying the outer skin, the adhesive film layer, the connecting embedded part, the multi-layer copper-clad foam board, the adhesive film layer, and the inner skin on a precision flat plate, and forming by vacuum-assisted curing;

[0076] Among them, the multi-layer copper-clad foam boards are adhered through the adhesive film layer.

[0077] Taking the two-layer copper-clad foam board as an example, referring to Figure 3 the large-sized flat obliquely polarized radome shown, sequentially lay the outer skin (1), the adhesive film layer (2), the connecting embedded part (8), the single-sided copper-clad foam board (3), the adhesive film layer (4), the double-sided copper-clad foam board (5), the adhesive film layer (6), and the inner skin (7) on a precision flat plate, and then form by vacuum bag pressing.

[0078] Based on the above technical solution, a large-sized flat obliquely polarized radome in the present invention adopts a dielectric layer removal design, which optimizes the electrical performance of the radome. The continuous polarization grating design improves the reliability and environmental adaptability of the radome structure; at the same time, the delamination number of the large-sized obliquely polarized radome is reduced, and the forming process is simplified into a similar conventional A sandwich radome, thereby reducing the difficulty in the process and ensuring reliable process stability.

[0079] In some embodiments, the forming method of the obliquely polarized radome further includes: uniformly laying the copper strip on the surface of the foam board pre-coated with an epoxy adhesive layer in a rolling and pasting manner in the positioning template guide groove.

[0080] In one implementation, the copper strip is evenly laid on the surface of the foam board pre-coated with an epoxy adhesive layer in a rolling and pasting manner within the positioning template guide groove; wherein, the shape of the positioning template guide groove is the same as that of the polarization grating, and the thickness is 4 mm. Refer to Figure 12 , Figure 12 which is a schematic structural diagram of a positioning template provided by an embodiment of the present invention.

[0081] In some embodiments, before the copper strip is evenly laid on the surface of the foam board pre-coated with an epoxy adhesive layer in a rolling and pasting manner within the positioning template guide groove, the forming method of the oblique polarization radome further includes: adding a uniform epoxy adhesive layer on the surface of the foam board by screen printing.

[0082] In one implementation, a uniform epoxy adhesive layer is added to the foam board by screen printing. The thickness of the adhesive layer is 0.05 mm, the width of the adhesive layer is 1.9 mm, and the width of the adhesive layer is reduced by 10% compared to the width of the polarization grating.

[0083] Among them, the screen printing template adopts a structural form of a stainless steel thin plate + a process frame around. After the stainless steel thin plate is laser cut with leakage holes, a release agent is evenly coated on it.

[0084] Refer to Figure 13 , Figure 13 which is a schematic structural diagram of a screen printing template provided by an embodiment of the present invention. As Figure 13 shown, the screen printing template includes a high-precision stainless steel mesh plate (9) and a process frame (10). Among them, the process frame (10) plays a role in maintaining the shape of the high-precision stainless steel mesh plate (9), and the positioning of the high-precision stainless steel mesh plate (9) and the foam board is realized by using the hole positions around the foam board.

[0085] The formed large-size flat oblique polarization radome (as Figure 1 shown) is fixedly sealed on the vehicle-mounted interference system product through the through holes on the flange around, and passes through various environmental tests such as high and low temperatures, rain, transportation vibration, and durability with the product. The test results show that its electrical performance and stiffness characteristics meet the use requirements. Therefore, the structural design ideas and methods proposed and adopted in the present invention are reasonable and feasible, and have good application and promotion prospects in the interference system.

[0086] In summary, compared with the prior art, the following beneficial effects are achieved:

[0087] The polarization grid bars are made of continuous copper strips, avoiding potential problems such as block segmentation, splicing, and break-point connection in the polarization grid bars, effectively solving the problem of cracking and short-circuiting in the use of existing large-sized inclined polarization radomes, and improving the structural reliability of the large-sized flat inclined polarization radome and the performance of the antenna system; and through the design of removing the dielectric layer, that is, introducing a copper-clad foam board, fixing several copper strips on the foam board at equal distances, and combining multiple copper-clad foam boards to form a multi-layer polarization grid, without a substrate, reducing the number of bonding layers, thereby reducing the dielectric loss value of the large-sized flat inclined polarization radome, reducing the delamination number and the complexity of the forming process of the inclined polarization radome, and further improving the process stability and environmental adaptability of the large-sized flat inclined polarization radome.

[0088] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slant-polarized radome, characterized in that, The slant-polarized radome includes: an inner skin, a copper-clad foam board, an outer skin and an adhesive film layer; The inner skin, the copper-clad foam board and the outer skin are adhered together through the adhesive film layer; The copper-clad foam board is a foam board with a number of copper strips arranged at equal distances on its surface, and any single copper strip is a continuous copper strip; Among them, the copper strips on the same surface of the foam board are used as the same layer of polarization gratings, and the single copper strip is used as a polarization grating bar; The forming method of the copper-clad foam board includes: first, by means of screen printing, a uniform epoxy adhesive layer is added to the surface of the foam board, and then the copper strip is evenly laid on the surface of the foam board pre-coated with the epoxy adhesive layer in a rolling and pasting manner in the positioning template guide groove.

2. The obliquely polarized radome according to claim 1, characterized in that, The material of the copper strip is T2Y, and the thickness of the copper strip is 0.05mm - 0.12mm.

3. The obliquely polarized radome according to claim 1, wherein The material of the foam board is poly(methacrylimide) closed-cell rigid hard foam, with a dielectric loss value less than 1.2 and a loss tangent value less than 0.

004.

4. The obliquely polarized radome according to claim 1, characterized in that, In the copper-clad foam board, a number of copper strips are laid on one side or both sides of the foam board at equal distances.

5. The obliquely polarized radome according to claim 1, wherein The slant-polarized radome further includes a connecting embedded part, and the connecting embedded part penetrates through multiple layers of copper-clad foam boards.

6. The obliquely polarized radome according to claim 1, characterized in that The materials of the inner skin and the outer skin include: a combination of glass fiber and epoxy resin, or a combination of quartz fiber and cyanate resin; The material of the adhesive film layer includes: epoxy resin, or cyanate resin; Among them, in the same slant-polarized radome, the materials of the inner skin and the outer skin are the same, and the resin type of the adhesive film layer is the same as the resin types of the inner skin and the outer skin.

7. A forming method of an inclined polarization radome, characterized in that, Based on the slant-polarized radome according to any one of claims 1-6, the forming method includes: sequentially laying the outer skin, the adhesive film layer, the connecting embedded part, multiple layers of copper-clad foam boards, the adhesive film layer, and the inner skin on a precision flat plate, and curing by vacuum-assisted forming; Among them, the multiple layers of copper-clad foam boards are adhered together through the adhesive film layer.

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