CN103296414B - Metamaterial antenna cover - Google Patents

Abstract

The present invention relates to a kind of metamaterial antenna cover, and it includes rigid framework and is fixed on the metamaterial plate with multiple metal micro structures on the framework surface, so as to form a cavity for being used to accommodate antenna.Because the rigidity of the framework is preferable, so that the metamaterial antenna cover has good mechanical performance, and the metamaterial plate for being covered in the framework has metal micro structure, and the loss to electromagnetic wave is smaller, also makes it have superior wave transparent performance.

Description

Metamaterial Radome

technical field

The present invention relates to a radome, and more particularly, to a metamaterial radome.

Background technique

In the antenna system, a radome is often used to protect the antenna from the harsh external environment, which not only prolongs the service life of the antenna, but also makes the antenna more concealed. Generally, this kind of radome is made of wave-transparent materials, such as high-molecular polymers such as fiberglass, epoxy resin, ABS, and UPVC with low dielectric constant and loss tangent and high mechanical strength, so that the radome has good Wave transparency and mechanical properties. However, with the emergence of new application requirements, the radome made of existing materials can no longer meet people's requirements for the antenna's mechanical properties and high transmittance.

Metamaterials are artificial composite structures with extraordinary physical properties that are not found in natural materials. Currently, metal microstructures with certain geometric shapes are periodically arranged on dielectric substrates to form metamaterials. Since the geometric shape, size and arrangement of metal microstructures can be used to change the dielectric constant and/or magnetic permeability of each point in the metamaterial space, it can produce the expected electromagnetic response, thereby controlling the propagation of electromagnetic waves. Therefore, it has broad application prospects in many fields and has become a research hotspot for researchers from all over the world. Using metamaterials as new wave-transparent materials to manufacture radomes is one of the application areas that people give priority to.

Contents of the invention

The technical problem to be solved by the present invention is to provide a metamaterial radome with better mechanical properties and wave-transmitting properties.

The technical solution adopted by the present invention to solve the technical problem is: a metamaterial radome, including a rigid frame and a metamaterial plate with a plurality of metal microstructures fixed on the surface of the frame, thereby forming a radome for accommodating the antenna cavity.

Preferably, the metamaterial sheet is fixed to the frame by glue.

Preferably, the frame includes a frame body, a concave groove is opened around the frame body, and the metamaterial sheet is fixed in the concave groove.

Preferably, the frame further includes a guide groove part provided on the frame body, and the guide groove part forms a guide groove communicating with the cavity.

Preferably, the frame body is substantially U-shaped, and the guide grooves are provided on two extension ends of the frame body.

Preferably, the metamaterial sheet includes at least one metamaterial sheet, and each metamaterial sheet includes two dielectric substrates bonded together and a substrate placed between the two dielectric substrates and covered by the two dielectric substrates. a structural layer formed from the plurality of metal microstructures.

Preferably, the metamaterial sheet comprises multiple laminated metamaterial sheets.

Preferably, the metamaterial sheet includes at least one dielectric substrate and at least one structural layer pressed on the dielectric substrate, and the structural layer is formed by the plurality of metal microstructures.

Preferably, the multilayer dielectric substrates and multilayer structure layers of the metamaterial sheet are alternately stacked together.

Preferably, the outermost side of the metamaterial sheet is covered by two layers of dielectric substrates.

The metamaterial radome of the present invention has the following beneficial effects: due to the better rigidity of the frame, the metamaterial radome has good mechanical properties, and the metamaterial plate covering the frame has a metal microstructure, The loss of electromagnetic waves is small, which also makes it have superior wave-transmitting performance.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the three-dimensional exploded view of a specific embodiment of the metamaterial radome of the present invention;

Fig. 2 is a schematic cross-sectional view of a metamaterial sheet of the metamaterial sheet in Fig. 1;

Fig. 3 is a schematic plan view of some structural layers of the metamaterial sheet in Fig. 2;

FIG. 4 is a perspective assembly view of FIG. 1 .

The names corresponding to the labels in the figure are:

10 metamaterial radome, 20 frame, 22 frame body, 222 recessed groove, 24 guide groove part, 242 guide groove, 26 cavity, 30 metamaterial plate, 40 metamaterial sheet layer, 42, 44 dielectric substrate, 46 structural layer , 48 metal microstructure

detailed description

As shown in Figure 1, the metamaterial radome 10 of the present invention includes a hollow rigid frame 20 and a metamaterial plate 30 that can be fixed on the surface of the frame 20, and the two shown in Figure 1 can be respectively fixed on the frame 20 on two opposite sides of the metamaterial sheet 30 . The frame 20 is made of any existing material such as fiberglass, and includes a substantially U-shaped frame body 22 and elongated guide grooves 24 disposed at two extending ends of the frame body 22 . A concave groove 222 is respectively formed on both sides of the periphery of the frame body 22 . The guiding groove portion 24 forms a guiding groove 242 .

As shown in FIGS. 2 and 3 , each metamaterial sheet 30 includes at least one metamaterial sheet 40 . Each metamaterial sheet 40 includes two dielectric substrates 42 , 44 bonded together and a structural layer 46 placed between the two dielectric substrates 42 , 44 and covered by the two dielectric substrates 42 , 44 . The two dielectric substrates 42, 44 can be made of polymer materials, ceramic materials, ferroelectric materials, ferrite materials, ferromagnetic materials, etc., and the two dielectric substrates 42, 44 can be made of the same material, or Can be made of two different materials; they can be equal or unequal in thickness. The two dielectric substrates 42, 44 shown in FIG. 2 are sheets of equal thickness made of the same material.

Please continue to refer to FIG. 3 , the structural layer 46 includes a plurality of metal microstructures 48 , as shown in the pattern separated by dotted lines, and FIG. 3 shows only part of the metal microstructures 48 of the structural layer 46 . We refer to each metal microstructure 48 and its corresponding two dielectric substrates 42, 44 as a metamaterial unit. Generally, the geometric dimension of each metamaterial unit is related to the wavelength of the electromagnetic wave passing through the metamaterial radome 10, for example, its geometric dimension is one-tenth of the electromagnetic wave wavelength. Each metal microstructure 48 is a planar or three-dimensional structure with a certain geometric shape composed of a metal wire segment of a certain size, wherein the cross section of the metal wire segment can be flat or any other shape, such as a cylinder. The metal microstructure 48 shown in FIG. 3 is a planar structure composed of metal wire segments with a flat cross section, and is periodically arranged, that is, the plurality of metal microstructures 48 are periodically arranged on the between the two dielectric substrates 42, 44 and covered by the two dielectric substrates 42, 44. In this embodiment, the plurality of metal microstructures 48 are formed by etching a metal foil such as copper foil covering a dielectric substrate 42 (or 44), and then covering another dielectric substrate 44 (or 42 ) and cover the plurality of metal microstructures 48. Of course, the plurality of metal microstructures 48 may also be formed on the dielectric substrate 42 or 44 by means of electroplating, drilling, photolithography, electron etching or ion etching.

The metal microstructure 48 shown in FIG. 3 is only an example for illustration, and is roughly in the shape of a cross, and the two opposite metal line segments of every two adjacent metal microstructures 48 are located on the same straight line and arranged at intervals. In practice, the metal microstructure 48 may also be in any other shape as required. We use the geometric shape, size and arrangement of the metal microstructure 48 to change the dielectric constant and/or magnetic permeability of the metamaterial sheet 40, so that the loss of electromagnetic waves is small when passing through the metamaterial sheet 40 , There is less reflection when incident and leaving the metamaterial sheet 40 , thereby improving the wave transmittance of the metamaterial sheet 40 . It can be seen that even if the metamaterial plate 30 is composed of multiple layers of the metamaterial sheets 40 , it has a relatively high wave transmittance.

Please continue to refer to FIG. 4. During assembly, the two metamaterial plates 30 are respectively placed in the recessed grooves 222 on both sides of the frame body 22, and fixed on the frame 20 with glue, thereby forming a frame for accommodating The cavity 26 of the antenna, and the guide groove 242 of the guide groove part 24 communicates with the cavity 26 . At this time, the metamaterial radome 10 can be installed at the desired place, and the antenna (not shown) can be placed in the cavity 26 for protection. In this way, the metamaterial radome 10 has good mechanical properties due to the rigidity of the frame 20, and since the metamaterial sheet 30 covered on the frame 20 has a plurality of metal microstructures 48, it can reduce the antenna reception and / Or the loss of the emitted electromagnetic wave also makes it have superior wave-transmitting performance.

In fact, since the metal microstructure 48 in each metamaterial sheet 30 is placed between the two dielectric substrates 42 and 44 and is protected, it can be free from the adverse effects of harsh external conditions and not only maintain stable wave-transmitting performance , and because the two dielectric substrates 42, 44 are pressed together to form a compact structure, the mechanical properties are also better. Especially when it is necessary to make a thicker metamaterial radome 10 to meet diverse application requirements, the metamaterial sheet 30 can be formed by laminating multiple layers of metamaterial sheets 40 , so that its mechanical properties are better.

In addition, the metamaterial sheet 30 can be formed by at least one dielectric substrate and a structural layer composed of a plurality of metal microstructures laminated on the dielectric substrate; and when the metamaterial sheet 30 includes a multilayer dielectric substrate and a multilayer In layer structure layer, multi-layer dielectric substrates and multi-layer structure layers are stacked together alternately. Of course, the outermost sides of the metamaterial sheet 30 are covered by two dielectric substrates.

The above descriptions are only some specific embodiments of the present invention, and should not be construed as limiting the present invention. For those of ordinary skill in the art, without departing from the basic idea of the present invention, some improvements and modifications can also be made, such as the frame 20 can also be made of lightweight materials to make lighter components as required , to facilitate handling and installation; the metamaterial sheet 30 can also be made into any shape according to the shape of the frame 20 and other needs, or it can be spliced into a certain shape by a plurality of metamaterial sheets 30, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (9)

1. A kind of 1. metamaterial antenna cover, it is characterised in that including rigid framework and be fixed on the framework surface have it is more The metamaterial plate of individual metal micro structure, so as to form a cavity for being used to accommodate antenna；The multiple metal micro structure is in week Phase property is arranged, and each metal micro structure is the plane or vertical with certain geometrical shape being made up of the metal wire sections of certain size Body structure；Two relative metal wire sections of every two adjacent metal micro structure are located along the same line and are arranged at intervals；The framework Including a support body to take the shape of the letter U, the periphery of the support body offers recessed groove, and the metamaterial plate is fixed on the recessed groove； The metamaterial plate includes an at least metamaterial sheet, each metamaterial sheet include two medium substrates to fit together and The structure sheaf covered between two medium substrate by two medium substrate is placed in, the structure sheaf includes multiple gold Belong to micro-structural, each metal micro structure and two corresponding medium substrate parts form metamaterial unit, each Meta Materials list The physical dimension of member is through 1/10th of the electromagnetic wavelength of the metamaterial antenna cover.
2. 2. metamaterial antenna cover according to claim 1, it is characterised in that the metamaterial plate is fixed on using glue The framework.
3. 3. metamaterial antenna cover according to claim 1, it is characterised in that the framework is also arranged at the frame including one The channel guide section of body, the channel guide section form a guide groove being connected with the cavity.
4. 4. metamaterial antenna cover according to claim 3, it is characterised in that the support body is substantially u-shaped, the channel guide section It is arranged on two elongated ends of the support body.
5. 5. metamaterial antenna cover according to claim 1, it is characterised in that the metamaterial plate includes at least one surpassing material Tablet layer, each metamaterial sheet include two medium substrates to fit together and are placed between two medium substrate and by institute The structure sheaf of two medium substrates covering is stated, the structure sheaf is formed by the multiple metal micro structure.
6. 6. metamaterial antenna cover according to claim 5, it is characterised in that the metamaterial plate exists including Multi-layer force fit Metamaterial sheet together.
7. 7. metamaterial antenna cover according to claim 1, it is characterised in that the metamaterial plate includes an at least medium Substrate and at least one structure sheaf for being pressed together on the medium substrate, the structure sheaf are formed by the multiple metal micro structure.
8. 8. metamaterial antenna cover according to claim 7, it is characterised in that the multilayer dielectric substrate of the metamaterial plate It is alternatingly stacked together with multiple layer.
9. 9. metamaterial antenna cover according to claim 8, it is characterised in that the outermost of the metamaterial plate is situated between by two Matter substrate covers.