A radome

Abstract

The present invention discloses a radome, which comprises: a wave-transmitting structural layer, the wave-transmitting structural layer comprises a skin layer and a metal hollow layer, the metal hollow layer is arranged between two adjacent skin layers; wherein the metal hollow layer comprises: a plurality of hollow structures, the hollow structure comprises: a polygonal metal sheet, a straight groove is arranged between opposite sides of the metal sheet, wherein the side length of the polygon is a positive even number. The present invention arranges the metal hollow layer between two adjacent skin layers, and the metal hollow layer comprises a plurality of hollow structures, and the hollow structure comprises a polygonal metal sheet, and a straight groove is arranged between opposite sides of the metal sheet, thereby forming a multilayer material composed of a metal microstructure and ordinary materials, which, on the one hand, ensures high wave transmission within the working frequency band, and on the other hand, also has good strength performance, providing a better protection environment for the normal operation of the antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna protection devices, and in particular to a radome. Background Art

[0002] Existing antenna covers are usually made of low-loss pure materials and can only protect the antenna. However, they can also affect the performance of the antenna within an allowable range.

[0003] For ordinary pure materials, the half-wavelength theory or quarter-wavelength theory is used to change the thickness of the material according to the frequency to adjust its wave transmission response to the incident electromagnetic wave. However, the existing radomes have the following three problems:

[0004] 1. When the incident electromagnetic wave band is low, the antenna cover will be too thick and heavy;

[0005] 2. The wave transmission performance of ordinary materials is relatively uniform. They can transmit waves within the working frequency band and the wave transmission effect of the adjacent frequency band is also good. The wave transmission outside the working frequency band is easy to interfere with the normal operation of the antenna;

[0006] 3. The wave transmittance at large angles is difficult to guarantee.

[0007] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0008] In response to the problems in the related technology, the present invention proposes a radome, which lays a metamaterial structure in a low-loss matrix material through a multi-layer stacking technology, so that the radome has a higher transmittance at a large angle, better ensuring the normal operation of the antenna, and at the same time has a higher mechanical strength.

[0009] The technical solution of the present invention is achieved in this way:

[0010] According to one aspect of the present invention, there is provided an antenna cover, which includes a cover body, and a receiving cavity for receiving an antenna is formed in the cover body.

[0011] The cover body includes: a wave-transmitting structural layer, the wave-transmitting structural layer includes a skin layer and a metal hollow layer, and the metal hollow layer is arranged between two adjacent skin layers; wherein the metal hollow layer includes: a plurality of hollow structures, and the hollow structure includes: a polygonal metal sheet, and straight grooves are arranged between opposite sides of the metal sheet, wherein the side length of the polygon is a positive even number.

[0012] According to an embodiment of the present invention, a hollow snap-fit ​​structure is further provided at the contact point between the linear groove and the edge of the metal sheet.

[0013] According to an embodiment of the present invention, a plurality of hollow structures are connected by a snap-fit ​​structure to form a single-layer conductive geometric structure.

[0014] According to an embodiment of the present invention, the metal hollow layer includes: a single-layer conductive geometric structure, or a multi-layer conductive geometric structure in which a single-layer conductive geometric structure is stacked.

[0015] According to an embodiment of the present invention, the metal sheet is a regular polygonal metal sheet.

[0016] According to one embodiment of the present invention, a plurality of straight grooves on the regular polygonal metal sheet intersect at the center of the regular polygon.

[0017] According to one embodiment of the present invention, a lightweight material layer is provided between the skin layer and the metal hollow layer.

[0018] According to one embodiment of the present invention, the lightweight material layer is a polymethacrylimide layer or a honeycomb structure layer.

[0019] According to an embodiment of the present invention, an adhesive film layer is provided between the lightweight material layer and the metal hollow layer.

[0020] According to one embodiment of the present invention, the dielectric constant of the skin layer is 2.7-3.2.

[0021] According to one embodiment of the present invention, the material of the metal sheet is gold, silver, copper, gold alloy, silver alloy, copper alloy, zinc alloy or aluminum alloy.

[0022] The beneficial technical effects of the present invention are:

[0023] The present invention arranges a metal hollow layer between two adjacent skin layers, and the metal hollow layer includes a plurality of hollow structures, and the hollow structure includes a polygonal metal sheet, and straight grooves are arranged between opposite sides of the metal sheet, thereby forming a multilayer material composed of a metal microstructure and ordinary materials. On the one hand, it ensures high wave transmittance within the working frequency band, and on the other hand, it also has good strength performance, thereby providing a better protection environment for the normal operation of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a schematic diagram of a cross section of a wave-transmitting structural layer according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of a hollow structure according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a single-layer conductive geometric structure according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of simulation results of the wave absorbing performance of the metamaterial according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] According to an embodiment of the present invention, a radome is provided.

[0031] like Figure 1 and Figure 2 As shown, the antenna cover according to an embodiment of the present invention includes: a wave-transmitting structure layer, the wave-transmitting structure layer includes a skin layer 1 and a metal hollow layer 4, the metal hollow layer 4 is arranged between two adjacent skin layers 1; wherein, the metal hollow layer 4 includes: a plurality of hollow structures, the hollow structure includes: a polygonal metal sheet, and a straight groove 21 is arranged between the opposite sides of the metal sheet, wherein the side length of the polygon is a positive even number.

[0032] In this embodiment, the common low-loss material in the prior art has a high wave transmittance, and the wave transmittance performance does not change much with the change of frequency. The present invention places a hollow structure in a sandwich of common materials and adjusts the electromagnetic response of the microstructure to modulate the incident electromagnetic wave. Specifically:

[0033] The cover is formed by placing a metal hollow layer 4 composed of a uniformly distributed hollow structure between two adjacent layers of skin composed of ordinary materials, so that the skin and the hollow structure constitute a wave-transmitting structure layer, and a light material layer 2 and a film layer 3 are also used in the wave-transmitting structure layer. Figure 1 As shown, the wave-transmitting structural layer includes, from top to bottom, a skin layer 1, a film layer 3, a metal hollow layer 4, a film layer 3, and a skin layer 1, wherein the film layer 3 can play a role in bonding the metal hollow layer 4 and the skin layer 1. In addition, in order to enhance the wave-transmitting performance of the radome, a lightweight material layer 2 can be provided between the skin layer 1 and the film layer 3, wherein the lightweight material layer 2 can be made of a honeycomb structure or a polymethacrylimide layer (or PMI layer) or other lightweight material with good wave-transmitting properties. In addition, although Figure 1The specific structure of the wave-transmitting structural layer is shown, but those skilled in the art should understand that the wave-transmitting structural layer can also be arranged according to actual needs. For example, according to one embodiment of the present invention, the wave-transmitting structural layer also includes: a film layer 3 is arranged between the skin layer 1 and the lightweight material layer 2; according to another embodiment of the present invention, a metal hollow layer 4 is also arranged on the outer surface of the skin layer 1, and the present invention is not limited to this.

[0034] In addition, if Figure 4 As shown in the simulation results of the radome, when the electromagnetic wave is incident on the radome and the TE wave irradiates the material along 70°, the electromagnetic wave transmission coefficient value in the 8-12GHz band is greater than -1dB, and the electromagnetic wave transmittance is very high.

[0035] With the aid of the above technical solution of the present invention, by arranging the metal hollow layer 4 between two adjacent skin layers 1, and the metal hollow layer 4 includes a plurality of hollow structures, and the hollow structure includes a polygonal metal sheet, and a straight groove 21 is arranged between the opposite sides of the metal sheet, so that a multilayer material composed of a metal microstructure and ordinary materials, on the one hand, ensures high wave transmittance within the working frequency band, and on the other hand, also has good strength performance, providing a better protection environment for the normal operation of the antenna.

[0036] According to an embodiment of the present invention, a hollow snap-fit ​​structure is further provided at the contact point between the linear groove 21 and the edge of the metal sheet.

[0037] In this embodiment, if Figure 2 As shown, the hollow structure is a regular hexagonal metal sheet, and a straight groove 21 is provided between each pair of opposite sides of the regular hexagon, and three straight grooves 21 in the regular hexagon are arranged at the center of the regular hexagon, and hollow buckle structures are also provided at the contact points between the straight groove 21 and the edge of the metal sheet, so that multiple hollow structures can be connected together through the buckle structures on the hollow structures. For example, according to one embodiment of the present invention, Figure 3 As shown, multiple hollow structures are periodically connected together through the buckle structures on the hollow structures to form a single-layer conductive geometric structure, which is equivalent to an LC circuit, allowing electromagnetic waves to pass through in a wide frequency band, thereby showing high wave transmission characteristics at 8-12 GHz. In addition, although Figure 2 and Figure 3 The hollow structure is shown to be a regular hexagon, but the hollow structure can also be any polygon with a positive even number, such as a quadrilateral or a hexagon.

[0038] In addition, the metal hollow layer 4 can be a single-layer conductive geometric structure, or a multi-layer conductive geometric structure superimposed by a single-layer conductive geometric structure. At the same time, the geometric size of each hollow structure in each layer of conductive geometric structure (the length or width of the adjustable polygon) can be adjusted. For example, according to one embodiment of the present invention, the metal hollow layer 4 is a single-layer conductive geometric structure superimposed by three layers, and the hollow structure in each single-layer conductive geometric structure adopts Figure 2 The hollow structure shown is connected and constituted, and the hollow structure is a regular hexagon, and the side length of the regular hexagon is 3mm. In the hollow structure, the width of the straight groove 21 is 1mm, and the snap structure includes a plurality of snap parts 22, and the snap part 22 is an open square structure, and the side length of the snap part 22 is 0.05mm; according to another embodiment of the present invention, the metal hollow layer 4 is a single-layer conductive geometric structure stacked with two layers, and the number of hollow structures in each single-layer conductive geometry is different, and the sizes of any two hollow structures in each layer are inconsistent. The present invention is not limited to this, so that different skin materials or hollow structures can be selected or their sizes can be adjusted to make the entire structure have total reflection performance or wave transmission performance in a certain frequency band.

[0039] According to one embodiment of the present invention, the dielectric constant of the skin layer is 2.7-3.2.

[0040] In this embodiment, the dielectric constant of the skin can be selected within the range of 2.7-3.2 according to actual needs. For example, according to one embodiment of the present invention, two layers of skin are arranged in the antenna cover, and the relative dielectric constants of the two layers of skin are 3.15 and 2.7 respectively. In addition, it can be understood that other coefficients of the skin can also be set according to actual needs. For example, according to one embodiment of the present invention, the losses of the two layers of skin are 0.005 and 0.0065 (purple) respectively; according to another embodiment of the present invention, the thicknesses of the two layers of skin are 0.4 mm and 0.1 mm respectively, and the present invention is not limited to this.

[0041] According to one embodiment of the present invention, the material of the metal sheet is gold, silver, copper, gold alloy, silver alloy, copper alloy, zinc alloy or aluminum alloy.

[0042] In this embodiment, the hollow structure can use any metal material, including but not limited to gold, silver, copper, gold alloy, silver alloy, copper alloy, zinc alloy or aluminum alloy, and the metal material can also be solid, liquid, fluid or powder.

[0043] In summary, with the help of the above-mentioned technical scheme of the present invention, by arranging the metal hollow layer between two adjacent skin layers, and the metal hollow layer includes a plurality of hollow structures, and the hollow structure includes a polygonal metal sheet, and straight grooves are arranged between the opposite sides of the metal sheet, so that a multilayer material composed of a metal microstructure and ordinary materials, on the one hand, ensures high wave transmittance within the working frequency band, and on the other hand, also has good strength performance, providing a better protection environment for the normal operation of the antenna.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A radome, comprising a cover body, wherein a cavity for accommodating an antenna is formed in the cover body, wherein: The cover body comprises: a wave-transmitting structural layer, the wave-transmitting structural layer comprises a skin layer and a metal hollow layer, and the metal hollow layer is arranged between the two adjacent skin layers; The metal hollow layer includes: a plurality of hollow structures, the hollow structures include: a polygonal metal sheet, a linear groove is arranged between opposite sides of the metal sheet, wherein the side length of the polygon is a positive even number, Among them, a hollow snap-on structure is also provided at the contact point between the linear groove and the edge of the metal sheet, and multiple hollow structures are connected by the snap-on structure to form a single-layer conductive geometric structure. The snap-on structure includes multiple snap-on components, and the snap-on component is an open square structure.

2. The radome according to claim 1, characterized in that: The metal hollow layer includes: the single-layer conductive geometric structure, or a multi-layer conductive geometric structure formed by stacking the single-layer conductive geometric structure.

3. The radome according to claim 1, characterized in that: The metal sheet is a regular polygonal metal sheet.

4. The radome according to claim 3, characterized in that: A plurality of straight grooves on the regular polygonal metal sheet intersect at the center of the regular polygon.

5. The radome according to claim 1, characterized in that: A light material layer is arranged between the skin layer and the metal hollow layer.

6. The radome according to claim 5, characterized in that: The light material layer is a polymethacrylimide layer or a honeycomb structure layer.

7. The radome according to claim 5, characterized in that: An adhesive film layer is arranged between the light material layer and the metal hollow layer.

8. The radome according to claim 1, characterized in that: The dielectric constant of the skin layer is 2.7-3.

2.

9. The radome according to claim 1, characterized in that: The material of the metal sheet is gold, silver, copper, gold alloy, silver alloy, copper alloy, zinc alloy or aluminum alloy.

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