CN218215694U - Wave absorber - Google Patents
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- CN218215694U CN218215694U CN202222847568.XU CN202222847568U CN218215694U CN 218215694 U CN218215694 U CN 218215694U CN 202222847568 U CN202222847568 U CN 202222847568U CN 218215694 U CN218215694 U CN 218215694U
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Abstract
The application discloses a wave absorber which comprises a super surface, wherein the super surface comprises a plurality of structural units, the structural units are periodically arranged in an array manner, and each structural unit comprises a substrate layer, a dielectric layer and a pattern layer with a pattern structure; wherein the thickness of the base layer is configured such that the base layer prevents electromagnetic waves from penetrating the super-surface to reduce the transmissivity of the electromagnetic waves; meanwhile, the super surface meets the condition that the dielectric constant is consistent with the magnetic conductivity of the super surface, so that the reflectivity of the electromagnetic wave is reduced. The technical scheme of the application can be used for realizing the absorption effect on the electromagnetic waves.
Description
Technical Field
The application relates to the technical field of electromagnetic waves, in particular to a wave absorber.
Background
The radar finds a target and determines a spatial position of the target by using a radio method, and therefore, the radar is also called "radio positioning", which is an electronic device that detects a target using an electromagnetic wave, irradiates the target by transmitting the electromagnetic wave, and receives an echo thereof, thereby obtaining information on a distance, a change rate of distance (radial velocity), an azimuth, an altitude, and the like of the target to a transmission point of the electromagnetic wave.
In practical applications, the frequency of the radar operating band is typically in the range of 30MHZ-300 GHZ. Therefore, in order to avoid the detection and tracking of the radar, the wave needs to be absorbed in the working wave band of the radar, so as to realize the stealth of the radar.
For example, a plurality of wave-absorbing honeycomb core layers are adopted, adjacent layers are bonded by using glue films, each wave-absorbing honeycomb core layer is impregnated by using a carbon black solution, but electromagnetic waves can be absorbed only by mutually overlapping a plurality of layers of materials with wave-absorbing effects, and the weight of the two wave-absorbing honeycomb core layers reaches 90kg.
Therefore, the stealth function needs to be realized by the superposition of the wave-absorbing material on the electromagnetic wave absorption effect in the existing equipment, and the whole equipment needs to be provided with a plurality of wave-absorbing devices, so that the equipment occupies a large space, has more internal parts and has higher weight, which is a problem to be solved urgently in the existing electromagnetic wave-absorbing equipment.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, namely the problem that optical equipment in the existing wave absorber is more, the application provides a wave absorber which comprises a super surface, wherein the super surface comprises a plurality of structural units, the structural units are periodically arranged in an array manner, and each structural unit comprises a substrate layer, a dielectric layer and a pattern layer with a pattern structure;
wherein a thickness of the base layer is configured such that the base layer prevents electromagnetic waves from penetrating the super-surface;
the dielectric constant of the super surface is equal to the permeability of the super surface.
By adopting the technical scheme, on one hand, the electromagnetic wave is prevented from transmitting the super surface through the setting of the thickness of the substrate layer. Impedance matching, on the other hand, brings the impedance of the hypersurface and free space into agreement, so that the incident wave is not reflected at the hypersurface, but rather enters as far as possible, preferably completely, into the interior of the hypersurface and there dissipates energy, for example by resonance or the like, so that absorption of the electromagnetic wave is achieved.
In one embodiment of the present application, the base layer has a thickness greater than or equal to a skin depth of an electromagnetic wave incident to the super-surface. Here, it is to be explained that: when alternating current or alternating electromagnetic field exists in the conductor, the current distribution in the conductor is uneven, the current is concentrated on the skin part of the conductor, namely the current is concentrated on the thin layer on the outer surface of the conductor, the closer to the surface of the conductor, the higher the current density is, and the smaller the current is actually in the conductor. As a result, the resistance of the conductor increases, and its power loss also increases. This phenomenon is called skin effect. The skin effect increases the effective resistance of the conductor. The higher the frequency (f), the more pronounced the skin effect. When a current having a high frequency passes through the wire, it is considered that the current flows only in a thin layer on the surface of the wire, which is equivalent to a reduction in the cross section of the wire and an increase in the resistance. Since the central portion of the wire has little current flow, this central portion can be removed to save material. Therefore, a hollow wire may be used instead of a solid wire in the high-frequency circuit. The thickness of this wire is called the skin depth.
In one embodiment of the present application, the space between the pattern structures is filled with a filling material to reinforce and protect the pattern structures of the pattern layer.
In one embodiment of the present application, the pattern layer includes a cross pattern and at least four fan patterns, wherein the fan patterns are respectively disposed in respective quadrants of the cross pattern, and a space is disposed between the fan patterns and the cross pattern.
In one embodiment of the present application, the pattern structures are filled with a filling material therebetween.
In one embodiment of the present application, the wave absorber further includes a phase change device, where the phase change device includes a first electrode layer, a second electrode layer, and a phase change material layer, where the first electrode layer is filled around the pattern structure, and a height of the first electrode layer is lower than a height of the pattern structure; the phase change material layer is arranged on one side, away from the substrate layer, of the first electrode layer and is filled around the pattern structure, and the sum of the heights of the first electrode layer and the phase change material layer is larger than or equal to the height of the pattern structure; the second electrode layer is arranged on one side, far away from the substrate layer, of the phase change material layer.
By adopting the technical scheme, the pattern layer can be regulated and controlled through voltage, so that the electromagnetic wave absorption wave band of the wave absorber can be dynamically changed.
In one embodiment of the present application, the pattern layer includes at least two concentrically arranged square ring patterns and a plurality of bar patterns; a space is arranged between any adjacent square ring patterns in the at least two square ring patterns which are concentrically arranged, and the plurality of strip patterns are arranged in the space corresponding to the space; and in the direction far away from the center of the square ring pattern, the second to Nth square rings in the at least two square ring patterns which are concentrically arranged have at least one opening, N is a natural number and is more than or equal to 2.
In one embodiment of the present application, the material of the base layer is a metal; and/or the dielectric layer is made of metal, non-metal oxide or polymer.
In one embodiment of the present application, the polymer comprises an epoxy fiberglass cloth substrate or polyimide.
In one embodiment of the present application, the structural units are close-packed structures, and the pattern structure of the pattern layer is disposed at the vertices, contour intersections, and/or the center positions of the structural units.
In one embodiment of the present application, the frequency of the absorption band of the absorber is in the range of 30MHz to 300 GHz.
The beneficial effect of this application does:
1. in the wave absorber of this application, the thickness of the stratum basale of super surface can be set for according to required absorption electromagnetic wave frequency, and stratum basale thickness satisfies not less than the skin depth of incident electromagnetic wave, just can prevent from the electromagnetic wave to penetrate super surface from this. Meanwhile, the impedance of the super surface is matched with the impedance of the free space, so that incident electromagnetic waves are not reflected when passing through the super surface and are incident into the super surface.
2. Through set up phase change device in the pattern layer of this application, change phase change material's phase transition state with the help of voltage regulation and control, can the dynamic adjustment electromagnetic wave absorption wave band to make the ripples ware of this application can carry out the dynamic adjustment to various environment, can be used more extensively.
3. This application makes the overall structure of inhaling the ripples system simpler, weight is lighter and the volume is littleer and handy through adopting super surface.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.
FIG. 1 is a cross-sectional view of a super-surface in one embodiment of the present application.
Fig. 2 is a schematic structural diagram of a pattern layer in one embodiment of the present application.
Fig. 3 is a graph showing the effect of one embodiment of the present application.
Fig. 4 is a schematic structural diagram of a pattern layer according to another embodiment of the present application.
FIG. 5 is a cross-sectional view of the super-surface of the embodiment shown in FIG. 4.
Fig. 6 is a graph showing the effect of the embodiment shown in fig. 4.
FIG. 7 is a schematic diagram of the arrangement of structural units in the super-surface of the present application.
Fig. 8 is a schematic structural view of one embodiment of the wave absorber of the present application.
In the drawings, reference numerals denote:
1. a super-surface; 11. a base layer; 12. a dielectric layer; 13. a pattern layer; 14. a pattern structure; 23. a phase change material layer; 24. a first electrode layer; 25. a second electrode layer.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like numbers refer to like elements throughout. Also, in the drawings, the thickness, ratio and size of the components are exaggerated for clarity of explanation.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, "a," "an," "the," and "at least one" do not denote a limitation of quantity, but rather are intended to include both the singular and the plural, unless the context clearly dictates otherwise. For example, "a component" means the same as "at least one component" unless the context clearly dictates otherwise. "at least one of" should not be construed as limited to the quantity "one". "or" means "and/or". The term "and/or" includes any and all combinations of one or more of the associated listed items.
Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "comprising" or "comprises" indicates the property, quantity, step, operation, component, part or combination thereof, but does not exclude other properties, quantities, steps, operations, components, parts or combination thereof.
Embodiments are described herein with reference to cross-sectional views that are idealized embodiments. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, regions shown or described as flat may typically have rough and/or nonlinear features. Also, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.
In the prior art, a plurality of resistance layers with proper resistance values are arranged on a metal bottom plate, so that a Salisbury screen or a Jaumann wave absorber can be formed, the two structures have certain electromagnetic wave selectivity and have different characteristics at different electromagnetic wave frequencies, for example, the Jaumann wave absorber is used for absorbing electromagnetic waves to form a wave absorbing structure, the Salisbury screen is used for transmitting radar waves to form a radar cover, but the wave absorbing structure has pertinence to the frequency of the electromagnetic waves and cannot meet the requirement of the radar electromagnetic wave within the frequency range.
For the above reasons, the inventor proposes a wave absorber, which can solve the disadvantages of the prior art.
Hereinafter, exemplary embodiments of the present application will be described with reference to the accompanying drawings.
Referring to fig. 1, the present application proposes a wave absorber, in particular a radar signal broadband wave absorber, which can absorb electromagnetic waves in the frequency range of 30MHz-300GHz, for example. The wave absorber comprises a super surface 1 or consists of the super surface 1. The super surface 1 of this application comprises a plurality of constitutional units, and a plurality of constitutional units are periodic array and arrange, and every constitutional unit all includes stratum basale 11 and sets up dielectric layer 12 and the pattern layer 13 in stratum basale 11 top region.
The super-surface 1 is a sub-wavelength artificial nanostructure film, and the amplitude, phase and polarization of incident light can be modulated by the structural units arranged thereon, wherein it should be noted that the structure can be understood as a sub-wavelength structure capable of causing phase jump, and the structural units are structural units centered on each structure obtained by dividing the super-surface 1. The structures are periodically arranged on the substrate in the super surface 1, wherein the structures in each period form a structural unit, wherein the structural unit can be in a close-packed pattern, such as a regular quadrangle, a regular hexagon and the like, each period comprises a group of structures, and the vertexes and/or centers of the structural units can be provided with structures, for example. When the structural unit is a regular hexagon, at least one structure is provided at each vertex and center position of the regular hexagon. Alternatively, in the case of a square, at least one structure is provided at each vertex and central position of the square. Ideally, the structural units should be arranged in a hexagonal vertex and center or a square vertex and center, and it should be understood that the actual product may have structural defects at the edge of the super surface 1 due to the limitation of the shape of the super surface 1, so that the complete hexagon/square is not satisfied. Specifically, as shown in fig. 7, the structural units are regularly arranged in a structure, and a plurality of structural units are arranged in an array to form a super-surface 1 structure.
In this application, carry out the design to the wave-absorbing device according to the whole reflection and the transmission of wave-absorbing device to electromagnetic wave for the radar can't receive electromagnetic wave's echo or the echo of the electromagnetic wave received is not enough to show enough information, and the radar signal broadband wave-absorbing device of this application satisfies following absorption formula from this:
A(ω)＝1-R(ω)-T(ω)；
wherein A (omega) is the absorption rate of the wave absorber, R (omega) is the reflectivity of the wave absorber, and T (omega) is the transmissivity of the wave absorber.
To achieve the wave absorbing effect, it is desirable to reduce R (ω) and T (ω), preferably to near 0, most preferably to 0. Wherein the maximum value of the reflectance is 10%.
Among them, as for the transmittance T (ω), the base layer 11 may be configured such that its thickness is sufficient to prevent the electromagnetic wave from penetrating the super surface 1, thereby reducing, preferably preventing, the transmission of the electromagnetic wave.
In a preferred embodiment, the thickness of the base layer 11 can be calculated by the skin depth of the operating band of the absorber, and therefore, in order to achieve reduction or prevention of electromagnetic wave transmission, the thickness of the base layer 11 can be designed to be greater than or equal to, preferably greater than, the skin depth of the incident electromagnetic wave. Here, the thickness of the base layer 11, although it should be greater than the skin depth, should preferably be kept within a certain range to keep the overall size and weight of the wave absorber within a certain range. Preferably, the thickness of the base layer 11 is greater than or equal to 110% of the skin depth, and in one particular embodiment, the thickness of the base layer 11 may be 120% of the skin depth.
In contrast, the reflectivity R (ω) is such that the incident electromagnetic wave is not reflected by the super-surface 1 after passing through the wave absorber of the present application, and that the incident electromagnetic wave should be mostly, preferably completely, injected into the interior of the material and then dissipated, for example, by resonance effects. Therefore, the impedance Z (ω) of the super-surface 1 and the impedance Z of the free space are made to match each other according to the impedance matching principle 0 (ω) equal (where impedance Z of free space is 0 (ω) = 1), that is, the matching formula Z (ω) = Z is satisfied 0 (ω) = =1. Furthermore, the impedance of the super-surface 1 is
Therefore, after substituting the impedance of the super surface 1 into the matching equation, it can be concluded that ∈ (ω)/μ (ω), i.e., the permittivity and permeability of the super surface 1 need to be made equal.
To this end, the material, the geometrical parameters and/or the arrangement of the pattern structure 14 are set such that the super surface 1 satisfies the above absorption formula.
In one particular embodiment, shown in FIG. 1, the meta-surface 1 is a three-layer structure, namely, a base layer 11, a dielectric layer 12, and a patterned layer 13. Here, the pattern layer 13 includes or is composed of a metal. In addition, a material of a medium having good conductivity, for example, a metal, may be selected for the base layer 11. For the intermediate dielectric layer 12, a metal or nonmetal oxide or other materials may be selected, for example, polymers such as an epoxy glass fiber cloth substrate (FR 4, film = Retardant = 4) or Polyimide, wherein, for example, polyimide (PI, polyimide) is a high-performance polymer material with an imide ring as a structural feature, has excellent thermal stability, chemical resistance, mechanical properties and good dielectric properties, and can be better applied to the dielectric layer 12 of the present application.
The period of the array of structuring elements of the super-surface 1 is 10 to 20mm, i.e. the width of the base layer 11 and the intermediate layer 12 of the structuring elements is 10 to 20mm. In the case of the base layer 11 being metal, its thickness may be, for example, 8 to 16mm, in order to ensure that it does not transmit the incident electromagnetic waves while ensuring that the overall weight of the absorber is low. Further, the thickness of the dielectric layer 12 may be, for example, 3 to 6mm to ensure sufficient electrical insulation. And the thickness of the pattern layer 13 may be in the range of 0.5 to 2mm, for example.
Here, in order to further reinforce the strength of the pattern structure 14 for more favorable use in a severe environment, filling material may be filled between the patterns. The filler material can be, for example, SU-8 polymer.
Regarding the pattern of the pattern layer 13 of the super surface 1, the pattern is used to realize impedance matching, and absorption response to electromagnetic waves of a specific wavelength band is realized by a specific pattern. Illustratively, the pattern layer 13 includes a plurality of pattern units, as shown in fig. 2, each pattern unit includes a cross pattern made of a metal material and at least four fan-shaped patterns, wherein the cross pattern is located at a central position of the pattern layer, and the fan-shaped patterns are uniformly distributed in each quadrant formed by the cross pattern. In one embodiment, the cross pattern has uniform length and width and is perpendicular to each other to form four square areas, or in another embodiment, the transverse structure of the cross pattern and the longitudinal structure thereof are arranged at an angle different from 90 degrees, and the fan-shaped patterns of the corresponding quadrants are adjusted accordingly according to the size of the areas.
Here, the pattern layer 13 has a gap between the cross pattern and the fan pattern, as shown by I in FIG. 2 4 . The gap, the cross pattern and the fan-shaped pattern act together to form a resonant cavity, and electromagnetic waves incident to the wave absorber are absorbed by the super surface and pass through the harmonics in the pattern layerThe cavity can be used for energy loss of electromagnetic waves entering the inside of the super-surface 1, so that the electromagnetic waves are prevented from penetrating the wave absorber.
For example, in one particular embodiment, the material of the base layer 11 is copper, which has a conductivity of 5.96 × 10 7 S/m, the thickness of the substrate layer 11 is 11.6mm. The dielectric layer 12 has a thickness of 4mm, a refractive index of n =1.768, and is made of Al 2 O 3 . The material of the top pattern layer 13 is also metallic copper and has a thickness of 1.2mm. For a structural unit, the dimensions for a specific structural pattern and parts are shown in fig. 2, where the width D =15mm of the base layer 11 1 ＝＝12mm，l 2 ＝＝4.5mm，l 3 ＝＝1.2mm，l 4 ＝＝0.9mm。
The absorption rate of the wave absorber prepared by the parameters on electromagnetic waves is shown in figure 3, wherein the abscissa is the frequency of incident electromagnetic waves, and the ordinate is the absorption rate of the wave absorber, and the curve in the figure shows that the absorption rate of the wave absorber on normal incident electromagnetic waves can reach more than 90% under the condition that the working waveband of the electromagnetic waves is 2-7GHz, so that a good wave absorbing effect can be realized.
Alternatively, in another embodiment, as shown in fig. 4, the pattern layer 13 adopts a composite structure including at least two concentrically arranged square ring patterns and a plurality of bar patterns; a space is arranged between any adjacent square ring patterns in at least two square ring patterns which are concentrically arranged, and a plurality of strip patterns are arranged in spaces corresponding to the space; and along the direction far away from the center of the square ring pattern, the second to Nth square rings in the at least two square ring patterns which are concentrically arranged have at least one opening, N is a natural number and is more than or equal to 2. And the square ring pattern located outside the pattern layer 13 is provided in an open manner. For example, as shown in fig. 4 and 5, the pattern layer 13 may include two concentrically arranged square ring patterns, and an opening is provided on each side of the outer square ring. Wherein, the material of the substrate layer 11 is gold, and the conductivity thereof is 4.561 x 10 7 S/m, thickness a of the base layer 11 1 =15 μm; thickness a of dielectric layer 12 2 =18 μm and relative dielectric constant ∈ =4.3+0.11i, material FR4; the material of the top pattern layer 13 is a metal, such as gold, with a thickness a 3 =7 μm. The specific structural pattern and the size of each part of a structural unit are shown in fig. 4 and 5, wherein the width a =60 μm of the base layer 11 and the L of the pattern layer 13 1 ＝45μm，L 2 ＝35μm，L 3 ＝12μm，L 4 ＝22.5μm，L 5 ＝24μm，L 6 ＝6μm，L 7 ＝2.5μm，L 8 ＝2.5μm。
The absorption rate of the wave absorber prepared by the parameters on the electromagnetic waves is shown in figure 6, wherein the abscissa is the frequency of incident electromagnetic waves, and the ordinate is the absorption rate of the wave absorber, and the curve in the figure shows that the absorption rate of the absorber on normal incident electromagnetic waves can reach more than 90% under the condition that the working waveband of the electromagnetic waves is 0.4-1.4 THz, so that a good wave absorbing effect can be realized.
In a preferred embodiment, as shown in fig. 8, the wave absorber further comprises a phase change device comprising a first electrode layer 24, a second electrode layer 25 and a phase change material layer 23. Wherein the first electrode layer 24 is filled around the pattern structure 14 of the pattern layer 13, and the height of the first electrode layer 24 is lower than that of the pattern structure 14; the phase-change material layer 23 is arranged on one side of the first electrode layer 24 away from the substrate layer 11 and is filled around the pattern structure 14, and the sum of the heights of the first electrode layer 24 and the phase-change material layer 23 is greater than or equal to the height of the pattern structure 14; the second electrode layer 25 is arranged on one side of the phase-change material layer 23 away from the substrate layer; the first electrode layer 24 and the second electrode layer 25 are used to apply a voltage to the phase change material layer 23. The phase change material selected for the phase change material layer 23 may be germanium antimony tellurium (GST, ge) x Sb y Te z ) E.g. Ge 2 Sb 2 Te 5 . GST has and realizes that phase transition energy requires characteristics such as low, phase transition is reversible, and GST can realize the alternate reversible phase transition of crystalline state phase and amorphous state under the voltage of difference, the embodiment of the utility model provides a can utilize GST crystalline state and amorphous state refractive index's difference, realize the absorbing action to different frequency electromagnetic waves.
Through introducing above-mentioned phase change device, can change the absorption wave band of wave absorber as required dynamically to the realization absorbs the electromagnetic wave of different wave bands more in a flexible way, and then has enlarged the application range and the field of the wave absorber of this application, for example the wave absorber of this application can realize the absorption to microwave band, terahertz wave band, infrared band and visible light wave band.
It should be noted that the super-surface 1 provided in the embodiments of the present application can be processed by a semiconductor process, and has the advantages of light weight, thin thickness, simple structure and process, low cost, high consistency of mass production, and the like.
In summary, in the wave absorber of the present application, the thickness of the substrate layer 11 of the super-surface 1 can be set according to the frequency of the electromagnetic wave to be absorbed, and the thickness of the substrate layer 11 is not less than the skin depth of the incident electromagnetic wave, so that the electromagnetic wave can be prevented from penetrating through the super-surface 1. Meanwhile, the impedance of the super surface 1 is matched with the impedance of free space, so that incident electromagnetic waves are not reflected when passing through the super surface 1 and are incident into the super surface 1.
Through set up phase change device in the pattern layer 13 of this application, change phase change material's phase transition state with the help of voltage regulation and control, can the frequency range of dynamic adjustment absorption electromagnetic wave to make the ripples ware of this application can carry out the dynamic adjustment to various environment, still realize this ripples ware's more extensive use in addition.
This application makes the overall structure of wave absorber simpler, weight is lighter and the volume is littleer through adopting super surface 1.
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments disclosed in the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A wave absorber is characterized by comprising a super surface (1), wherein the super surface (1) comprises a plurality of structural units, the structural units are arranged in a periodic array manner, and each structural unit comprises a substrate layer (11), a dielectric layer (12) and a pattern layer (13) with a pattern structure (14);
wherein the thickness of the base layer (11) is configured such that the base layer (11) prevents electromagnetic waves from penetrating the meta-surface (1);
the dielectric constant of the super surface (1) is equal to the magnetic permeability of the super surface (1).
2. A wave absorber according to claim 1, wherein the thickness of the substrate layer (11) is larger than or equal to the skin depth of the electromagnetic waves incident to the super surface (1).
3. The wave absorber according to claim 1 or 2, wherein the pattern layer (13) comprises a cross pattern and at least four fan patterns, wherein the fan patterns are arranged in respective quadrants of the cross pattern and wherein a spacing is arranged between the fan patterns and the cross pattern.
4. A wave absorber according to claim 1, wherein the pattern structures (14) are filled with a filling material in between.
5. The wave absorber according to claim 3, further comprising a phase change device, wherein the phase change device comprises a first electrode layer (24), a second electrode layer (25) and a phase change material layer (23), wherein the first electrode layer (24) is filled around the pattern structure (14), and the height of the first electrode layer (24) is lower than that of the pattern structure (14); the phase change material layer (23) is arranged on one side, away from the substrate layer (11), of the first electrode layer (24) and filled around the pattern structure (14), and the sum of the heights of the first electrode layer (24) and the phase change material layer (23) is greater than or equal to the height of the pattern structure (14); the second electrode layer (25) is arranged on one side, far away from the substrate layer (11), of the phase change material layer (23).
6. The wave absorber according to claim 1 or 2, wherein the pattern layer (13) comprises at least two concentrically arranged square ring patterns and a plurality of strip patterns; a space is arranged between any adjacent square ring patterns in the at least two square ring patterns which are concentrically arranged, and the plurality of strip patterns are arranged in the space corresponding to the space; and in the direction far away from the center of the square ring pattern, the second to Nth square rings in the at least two square ring patterns which are concentrically arranged have at least one opening, N is a natural number and is more than or equal to 2.
7. The wave absorber according to claim 1, wherein the material of the base layer (11) is metal; and/or the dielectric layer (12) is made of metal, non-metal oxide or polymer.
8. The wave absorber of claim 7 wherein the polymer comprises epoxy fiberglass cloth substrate or polyimide.
9. A wave absorber according to claim 1, wherein the structural elements are of a close-packed type, and the pattern structure (14) of the pattern layer (13) is arranged at the vertices, contour intersections and/or the central positions of the structural elements.
10. The wave absorbing device of claim 1, wherein the frequency of the absorption band of the wave absorbing device is in the range of 30MHz to 300 GHz.
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| CN202222847568.XU CN218215694U (en) | 2022-10-27 | 2022-10-27 | Wave absorber |
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| CN202222847568.XU CN218215694U (en) | 2022-10-27 | 2022-10-27 | Wave absorber |
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