WO2019134599A1

WO2019134599A1 - Antenna cover

Info

Publication number: WO2019134599A1
Application number: PCT/CN2018/125122
Authority: WO
Inventors: 刘若鹏; 赵治亚; 刘政显
Original assignee: 深圳光启尖端技术有限责任公司
Priority date: 2018-01-08
Filing date: 2018-12-29
Publication date: 2019-07-11

Abstract

Disclosed is an antenna cover, comprising: a wave-transmitting structural layer comprising skin layers and a metal hollowed-out layer, the metal hollowed-out layer being arranged between two adjacent skin layers; wherein the metal hollowed-out layer comprises: multiple hollowed-out structures, each hollowed-out structure comprising: a polygonal metal sheet provided with a linear groove between opposite sides of the metal sheet, wherein the side length of the polygon is a positive even number. In the present invention, due to the fact that a metal hollowed-out layer is arranged between two adjacent skin layers, the metal hollowed-out layer comprises multiple hollowed-out structures, and each hollowed-out structure comprises a polygonal metal sheet with a linear groove arranged between opposite sides of the metal sheet, a multi-layered material composed of a metal microstructure and common materials guarantees high wave transmission in the working frequency band, and also has a good strength performance, thereby providing a better protection environment for the normal operation of the antenna.

Description

Radome cover

Technical field

The present invention relates to the field of antenna protection devices, and in particular to a radome.

Background technique

Existing radomes are usually made of a low-loss, pure material that only serves to protect the antenna, but it also affects the performance of the antenna to the permissible range.

For ordinary pure materials, using the half-wavelength theory or the quarter-wavelength theory, the thickness of the material is changed according to the frequency, and the transmission response to the incident electromagnetic wave is adjusted. However, the existing radome has the following three problems. :

1. When the incident electromagnetic wave band is low, the thickness of the radome will be too large, and the weight will be too large;

2. The wave-transparing performance of common materials is relatively uniform. The wave-transmission in the working frequency band is excellent in the wave-transmission effect of adjacent frequency bands. The wave-transmission outside the working frequency band easily interferes with the normal operation of the antenna;

3. The wave transmission rate at large angles is difficult to guarantee.

In view of the problems in the related art, no effective solution has been proposed yet.

Summary of the invention

In view of the problems in the related art, the present invention provides a radome that spreads a metamaterial structure in a low-loss matrix material by a multilayer stacking technique, thereby making the radome have a higher transmittance at a large angle, and Ensure that the antenna works properly and has high mechanical strength.

The technical solution of the present invention is implemented as follows:

According to an aspect of the invention, a radome is provided, the radome comprising a cover body having a receiving cavity for receiving an antenna.

The cover body comprises: a wave-transmission structure layer, the wave-transmission structure layer comprises a skin layer and a metal hollow layer, and the metal hollow layer is disposed between two adjacent skin layers; wherein the metal hollow layer comprises: a plurality of hollow structures, hollow structures The utility model comprises: a polygonal metal piece, wherein a straight groove is arranged between opposite sides of the metal piece, wherein the side length of the polygon is a positive even number.

According to an embodiment of the invention, the contact of the edge of the linear groove and the metal sheet is further provided with a snap-fit structure.

According to one embodiment of the invention, a plurality of hollow structures are connected by a snap-fit structure to form a single layer of conductive geometry.

According to an embodiment of the invention, the metal hollow layer comprises: a single layer of conductive geometry, or a single layer of conductive geometry superimposed multilayer conductive geometry.

According to an embodiment of the invention, the metal sheet is a regular polygonal metal sheet.

According to one embodiment of the invention, a plurality of linear grooves on the regular polygonal metal sheet intersect at the center of the regular polygon.

According to one embodiment of the invention, a layer of lightweight material is disposed between the skin layer and the metal hollow layer.

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

According to an embodiment of the invention, a film layer is disposed between the layer of lightweight material and the metal hollow layer.

According to an embodiment of the invention, the skin layer has a dielectric constant of 2.7-3.2.

According to an embodiment of the invention, the material of the metal sheet is gold, silver, copper, a gold alloy, a silver alloy, a copper alloy, a zinc alloy or an aluminum alloy.

Advantageous technical effects of the present invention are:

The present invention provides a metal hollow layer between adjacent two skin layers, and the metal hollow layer includes a plurality of hollow structures, and the hollow structure includes a polygonal metal piece, and a straight groove is disposed between opposite sides of the metal piece, thereby The multi-layer material consisting of metal microstructure and common materials guarantees high transmission in the working frequency band on the one hand, and good strength performance on the other hand, providing a better protection environment for the normal operation of the antenna.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a schematic view of a cross section of a transmission structure layer according to an embodiment of the present invention;

2 is a schematic view of a hollow structure according to an embodiment of the present invention;

3 is a schematic diagram of a single layer conductive geometry in accordance with an embodiment of the present invention;

4 is a schematic diagram showing simulation results of absorbing properties of a metamaterial according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention are within the scope of the present invention.

According to an embodiment of the invention, a radome is provided.

As shown in FIG. 1 and FIG. 2, a radome according to an embodiment of the present invention includes: a wave permeable structure layer including a skin layer 1 and a metal hollow layer 4, and a metal hollow layer 4 disposed on two adjacent skin layers 1; wherein, the metal hollow layer 4 comprises: a plurality of hollow structures, the hollow structure comprises: a polygonal metal piece, and the opposite sides of the metal piece are provided with a linear groove 21, wherein the side length of the polygon is a positive even number.

In this embodiment, the conventional low-loss material in the prior art has a high wave-transmission rate, and the wave-transmission performance does not change much as the frequency changes. The present invention places the hollow structure in a common material interlayer. By adjusting the electromagnetic response of the microstructure, the incident electromagnetic wave can be modulated, specifically:

The cover body is formed by placing a metal hollow layer 4 composed of a uniformly distributed hollow structure between two adjacent skin layers composed of a common material, so that the skin and the hollow structure constitute a wave-transparent structure layer, and the wave-transmission structure The layer of lightweight material 2 and the film layer 3 are also used in the layer. As shown in FIG. 1 , the wave-transmissive layer includes, in order from top to bottom, a skin layer 1, a film layer 3, a metal hollow layer 4, and a film layer. 3, the skin layer 1, wherein the film layer 3 can play the role of bonding the metal hollow layer 4 and the skin layer 1, in addition, in order to enhance the wave transmission performance of the radome, can also be in the skin layer 1 and the film layer A lightweight material layer 2 is provided between the three, wherein the lightweight material layer 2 may be a lightweight material having good microwave permeability such as a honeycomb structure or a polymethacrylimide layer (or a PMI layer), and 1 shows the specific structure of the transmission structure layer, but those skilled in the art should understand that the transmission structure layer can also be set according to actual needs, for example, according to an embodiment of the present invention, the transmission structure layer is further The method includes: providing a film layer 3 between the skin layer 1 and the lightweight material layer 2; Another embodiment of the invention, further provided with a hollow metal layer on the outer surface of the skin layer 4, which is not limited in the present invention.

In addition, as shown in FIG. 4, the simulation result of the radome is that when the electromagnetic wave is incident on the radome, the electromagnetic wave transmission coefficient value in the 8-12 GHz band is greater than -1 dB when the TE wave is irradiated to the material at 70°, and the electromagnetic wave is transmitted through. The wave rate is very high.

By means of the above technical solution of the present invention, the metal hollow layer 4 is disposed between the adjacent two skin layers 1, and the metal hollow layer 4 includes a plurality of hollow structures, and the hollow structure includes a polygonal metal piece, the metal piece A linear groove 21 is disposed between the opposite sides, so that the multi-layer material composed of the metal microstructure and the common material ensures high transmittance in the working frequency band on the one hand, and good strength performance on the other hand. The normal work provides a better protection environment.

According to an embodiment of the present invention, the contact between the linear groove 21 and the edge of the metal piece is further provided with a snap-fit structure.

In this embodiment, as shown in FIG. 2, the hollow structure is a regular hexagonal metal piece, and a linear groove 21 is disposed between each pair of opposite sides of the regular hexagon, and three of the regular hexagons The linear groove 21 is provided with a hollow snap structure at the contact of the straight hexagon 21 and the edge of the metal strip, so that the plurality of hollow structures can pass through the snap structure on the hollow structure Connected together, for example, according to one embodiment of the present invention, as shown in FIG. 3, a plurality of hollow structures are periodically connected together by a snap structure on the hollow structure to form a single layer conductive geometry, the single layer conductive geometry A circuit equivalent to one LC allows electromagnetic waves to pass through in a wide frequency band, and thus exhibits high wave transmission characteristics at 8-12 GHz. In addition, although FIG. 2 and FIG. 3 show that the hollow structure is a regular hexagon, the hollow structure may be any polygon of a positive even number such as a quadrangle or a hexagon.

In addition, the metal hollow layer 4 can be a single layer conductive geometry, and can also be a multi-layer conductive geometry with a single layer of conductive geometry superimposed, and the geometry of each hollow structure in each layer of conductive geometry (adjustable The length or width of the polygon can be adjusted. For example, according to an embodiment of the present invention, the metal hollow layer 4 is a three-layer superimposed single-layer conductive geometry, and the hollow structure in each single-layer conductive geometry adopts FIG. The hollow structure shown is connected, the hollow structure is a regular hexagon, and the side length of the regular hexagon is 3 mm. In the hollow structure, the width of the linear groove 21 is 1 mm, and the buckle structure comprises a plurality of buckles. Component 22, and the snap member 22 is a non-closed square structure, and the side length of the snap member 22 is 0.05 mm; according to another embodiment of the present invention, the metal hollow layer 4 is a 2-layer superimposed single The layer has a conductive structure, and the number of the hollow structures in each single-layer conductive geometry is different, and the sizes of any two hollow structures in each layer are inconsistent, which is not limited by the present invention. Optional skin material or of different hollow structure or resized, the entire structure having total reflection properties or performance in a transparent wave band.

According to one embodiment of the invention, the skin layer has a skin dielectric constant of 2.7-3.2.

In this embodiment, the dielectric constant of the skin can be selected according to actual needs in the range of 2.7-3.2. For example, according to an embodiment of the present invention, the radome is provided with two layers of skins, the two layers. The relative dielectric constants of the skins are 3.15 and 2.7, respectively. In addition, it is of course understood that other coefficients of the skin may also be set according to actual needs, for example, the loss of the two layers of skin according to an embodiment of the present invention. The thickness of the two layers of the skin is 0.4 mm and 0.1 mm, respectively, which is not limited in the present invention.

In this embodiment, the hollow structure may 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 may also be solid, liquid, Fluid or powder.

In summary, with the above technical solution of the present invention, the metal hollow layer is disposed between two adjacent skin layers, and the metal hollow layer includes a plurality of hollow structures, and the hollow structure includes a polygonal metal piece, metal A linear groove is arranged between the opposite sides of the sheet, so that the multi-layer material composed of the metal microstructure and the common material ensures high transmittance in the working frequency band on the one hand and good strength performance on the other hand. The normal operation of the antenna provides a better protection environment.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

A radome, the radome includes a cover body having a receiving cavity for accommodating an antenna, wherein the cover body comprises: a wave permeable structure layer, the permeable structure layer comprises a skin layer and a metal hollow layer, the metal hollow layer being disposed between the adjacent two layers of the skin layer;

The metal hollow layer includes: a plurality of hollow structures, the hollow structure includes: a polygonal metal piece, and a straight groove is disposed between opposite sides of the metal piece, wherein a length of the side of the polygon is a positive even number .
The radome according to claim 1, wherein the linear groove and the edge of the metal piece are further provided with a snap-fit structure.
The radome according to claim 2, wherein a plurality of said hollow structures are connected by said snap structure to form a single layer conductive geometry.
The radome of claim 3, wherein the metal hollow layer comprises: the single layer conductive geometry, or the multilayer conductive geometry in which the single layer conductive geometry is superimposed.
The radome according to claim 1, wherein the metal piece is a regular polygonal metal piece.
The radome according to claim 5, wherein a plurality of linear grooves on the regular polygonal metal piece intersect at a center of the regular polygon.
The radome according to claim 1, wherein a layer of lightweight material is disposed between the skin layer and the metal hollow layer.
The radome according to claim 7, wherein the layer of lightweight material is a polymethacrylimide layer or a honeycomb structure layer.
The radome according to claim 7, wherein a film layer is disposed between the layer of lightweight material and the metal hollow layer.
The radome according to claim 1, wherein said skin layer has a dielectric constant of 2.7 to 3.2.
The radome according to claim 1, wherein the metal piece is made of gold, silver, copper, a gold alloy, a silver alloy, a copper alloy, a zinc alloy or an aluminum alloy.