WO2017008709A1

WO2017008709A1 - Wave absorber structure

Info

Publication number: WO2017008709A1
Application number: PCT/CN2016/089493
Authority: WO
Inventors: 刘若鹏; 熊伟; 何嘉威; 叶金财; 刘列
Original assignee: 深圳光启尖端技术有限责任公司
Priority date: 2015-07-10
Filing date: 2016-07-08
Publication date: 2017-01-19

Abstract

A wave absorber structure, comprising a metal bottom plate (1) and an dielectric loss body (2) covering one surface of the metal bottom plate (1). Since the dielectric loss body (2) has high dielectric loss, compared with a common low-loss wave absorption material with multiple layers of wave absorption honeycombs in wave absorption performance, the wave absorber structure has a good wave absorption effect at a wide frequency band, so that not only the wave absorption performance is improved, but also this structure design reduces the thickness of the whole wave absorber structure and makes the wave absorber structure have a low areal density, and then enables the wave absorber structure to satisfy the application in the field having bearing and weight reduction requirements.

Description

Title of Invention: A absorbing structure

Technical field

[0001] The present invention relates to an absorber, and more particularly to a absorber structure.

Background technique

[0002] Electromagnetic wave absorbing materials (i.e., absorbing materials) can absorb incident electromagnetic waves, thereby reducing reflection and radiation of electromagnetic waves. Absorbing materials can reduce electromagnetic wave leakage in electronic systems, which can be used to reduce interference between electronic systems and improve electromagnetic compatibility.

[0003] Depending on the application, the absorbing material not only requires good absorbing properties, but also other properties such as weight, thickness and bandwidth. A single absorbing material is difficult to meet the comprehensive requirements of bandwidth and mechanical strength. The absorber structure is an important means to obtain lightweight broadband absorbing materials.

technical problem

[0004] However, the existing absorber structure has a narrow operating bandwidth, and particularly the low frequency band has poor absorbing effect. It is still desirable in practical applications to further improve the absorbing properties of the absorber structure.

[0005] According to the structure and shape, the absorbing material can be classified into a thin film absorbing material, a flat absorbing body, a pyramid or a pointed absorbing body, a honeycomb absorbing body, and the like. Absorbing materials not only require excellent absorbing properties, but also other properties such as weight, thickness and bandwidth depending on the application. Therefore, one design method cannot be expected to meet all performance requirements.

[0006] The absorber structure is an important means to obtain a lightweight broadband absorbing material. Generally, a low-density, low-dielectric dielectric material is formed between the resistor and the resistor. The resistance of the resistor is from surface to ground metal. The plate is gradually reduced. By changing the effective impedance along the thickness direction of the absorber to obtain the minimum reflection, the electromagnetic wave is maximally entered into the absorber, and the loss of the resistor and the interference between the layers are utilized to achieve the purpose of the absorption. . The bandwidth of the entire absorber is related to the number of layers used, and is an absorber of interference type and impedance gradient material.

[0007] In addition to the commonly used honeycomb structure, the absorber structure can employ various low dielectric absorbing materials, such as ceramic microspheres, carbon particles, and hollow glass microbeads, and the conventional one is based on ordinary low loss. The absorbing body of the layer absorbing honeycomb has a large thickness, and its absorption effect on the low frequency is not good, and the absorbing performance needs to be improved; The wave structure can also be made of high-loss materials, but due to the high density of the high-loss material, the low-area density cannot be met. And the absorber structure is generally applied to the part of the aircraft that needs to carry and lose weight. Therefore, the study of low-density ultra-wideband absorbers has great practical significance.

Problem solution

Technical solution

[0008] The present invention provides an absorber structure in view of the problem that the high loss material in the absorber in the prior art has a large density and cannot meet the requirement of low areal density.

The absorber structure provided by the present invention comprises a metal base plate and an electric loss body covering a surface of the metal base plate.

[0010] In the above absorbing structure, the absorber structure includes a layer of electrical loss body, and the electrical loss body includes a honeycomb layer and a resistor sheet layer, wherein the resistor sheet layer is superposed on the honeycomb layer.

[0011] The honeycomb layer includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet.

[0012] In the above-described absorbing structure, the absorber structure includes a plurality of layers of electric loss bodies, and the plurality of layers of electric loss bodies are closely superposed one upon another.

[0013] In the above-described absorbing structure, each of the multilayer electric loss bodies includes a honeycomb layer, and a resistor sheet superposed on the honeycomb layer.

[0014] In the above-described absorbing structure, in the absorber structure, a plurality of honeycomb layers and a plurality of resistor sheets are alternately stacked one on another.

[0015] In the above-described absorbing structure, each of the plurality of honeycomb layers includes a polymer resin sheet and a honeycomb structure which is disposed on the polymer resin sheet.

[0016] In the above absorbing structure, the honeycomb structures in each of the honeycomb layers are the same.

[0017] In the above absorbing structure, each of the resistor sheets includes a support surface and a plurality of resistor blocks on the support surface.

[0018] In the above-described absorbing structure, the support surface is located on the upper surface of the honeycomb layer below the corresponding resistor sheet layer.

[0019] In the above absorbing structure, each of the resistor sheets further includes a dielectric substrate under the respective resistor sheets to provide a support surface.

[0020] In the above-described absorbing structure, the sum of the resistance values of all the resistance blocks of each of the resistor sheets is the same.

[0021] In the above absorbing structure, the sum of the resistance values of all the resistor blocks of each resistor layer is different, and The incident surface of the electromagnetic wave is in a direction close to the metal base plate, and the sum of the resistance values of all the resistance blocks of the respective resistor sheets gradually decreases, wherein the incident surface of the electromagnetic wave is on the surface of the electric loss body and away from the metal base plate.

In the above absorbing structure, at least one of the shape, size and distribution of the resistor blocks is different in the different resistor sheets.

[0023] In the above absorbing structure, the plurality of resistor blocks each have a regular polygonal shape or an elliptical shape.

[0024] In the above-described absorbing structure, a plurality of resistor blocks in each of the resistor layers are periodically arranged in an array manner.

[0025] In the above absorbing structure, a plurality of resistor blocks in each of the resistor layers are randomly arranged.

In the above-described absorbing structure, each of the plurality of electric loss bodies has the same thickness.

[0027] In the above-described absorbing structure, the thickness of each of the plurality of electric loss bodies is not equal.

[0028] In the above absorbing structure, the thickness of the honeycomb layer is from 1 to 100 mm.

[0029] In the above absorbing structure, each honeycomb layer has a thickness of 50 mm.

[0030] The absorbing structure in the present invention comprises a metal base plate and an electric loss body covering a surface of the metal base plate. Since the electric loss body has high dielectric loss, the absorbing material of the ordinary low loss multilayer absorbing honeycomb is used. Compared with the absorbing property, the absorbing structure of the present invention has a good absorbing effect in a wide frequency band, not only improves the absorbing property, but also reduces the thickness of the entire absorbing structure and makes the suction The wave body structure has a low areal density, which in turn enables the absorbing structure of the present invention to be used in fields with load bearing and weight reduction requirements.

[0031] In addition, the present invention also provides a absorber structure, the absorber structure comprising: a metal base plate; a magnetic loss body located on the metal base plate; and at least one electricity located on the magnetic loss body Loss body.

[0032] Preferably, the magnetic loss body is a magnetic absorbing coating layer, and a surface of the magnetic absorbing coating layer is in close contact with a surface of the metal base plate.

[0033] Preferably, one of the at least one electrical loss body is in close contact with the other surface of the magnetic absorbing coating layer.

[0034] Preferably, the electrical loss body comprises: a honeycomb layer; and a resistor sheet; wherein the resistor layer is superposed on the honeycomb layer, and the honeycomb layer and the magnetic absorbing coating layer The other surface is in close contact

[0035] Preferably, the absorber structure comprises a plurality of electrical loss bodies, and the plurality of electrical loss bodies are closely adjacent to each other Superimposed.

[0036] Preferably, each of the plurality of electrical loss bodies comprises a honeycomb layer, and a resistor sheet superposed on the honeycomb layer.

[0037] Preferably, in the absorber structure, a plurality of honeycomb layers and a plurality of resistor sheets are alternately stacked one on another.

[0038] Preferably, the incident surface of the electromagnetic wave is a surface on the electrical loss body and away from the metal base plate.

[0039] Preferably, the magnetic absorbing coating layer comprises a polymer resin and a magnetic filler distributed in the polymer resin.

[0040] Preferably, the magnetic absorbing coating layer is located on a surface of the metal substrate adjacent to the laminate.

[0041] Preferably, the magnetic absorbing coating layer has a thickness of less than 15 mm.

[0042] Preferably, each of the plurality of honeycomb layers includes a polymer resin sheet and a honeycomb structure distributed in the polymer resin sheet.

[0043] Preferably, the honeycomb structures in each of the honeycomb layers are the same.

[0044] Preferably, each of the plurality of resistor sheets includes a support surface and a plurality of resistor blocks on the support surface.

[0045] Preferably, the support surface is located on an upper surface of the honeycomb layer below the corresponding resistor sheet layer.

[0046] Preferably, each of the plurality of resistor sheets further includes a dielectric substrate under the corresponding resistor layer to provide the support surface.

[0047] Preferably, the sum of the resistance values of all the resistor blocks of each of the plurality of resistor sheets is the same.

[0048] Preferably, the sum of the resistance values of all the resistor blocks of each of the plurality of resistor sheets is different, and from the incident surface of the electromagnetic wave to the direction close to the metal substrate, the resistor The sum of the resistance values of all the resistor blocks of the slice gradually decreases.

[0049] Preferably, at least one of the shape, size and distribution of the resistor blocks is different in different resistor sheets.

[0050] Preferably, the plurality of resistor blocks are all in a regular polygon or an ellipse.

[0051] Preferably, the plurality of resistor blocks in each of the resistor sheets are periodically arranged in an array manner.

[0052] Preferably, each of the plurality of electrical loss bodies has the same thickness.

[0053] According to the absorbing body structure of the embodiment of the present invention, the electric loss is obtained by using the electric loss body, and the magnetic loss is used. The magnetic body obtains magnetic loss, and the combined design of electrical loss and magnetic loss can significantly improve the absorbing effect.

Advantageous effects of the invention

Beneficial effect

[0054] The absorber structure is a multilayer structure. In one example, the magnetic loss body is a magnetic absorbing coating layer, and the electrical loss body comprises a honeycomb layer, and a resistive sheet layer superimposed on the honeycomb layer. The magnetic absorbing coating layer is located on at least one surface of the metal substrate, preferably on a surface of the metal substrate adjacent the laminate. In this preferred structural design, a plurality of electrical loss layers utilize the loss of electrical resistance and interference between the layers to achieve the purpose of absorbing the waves. The magnetic absorbing coating layer is located at the position of the magnetic field in the absorbing structure, which maximizes the magnetic loss effect of the magnetic absorbing coating layer. Further, the bandwidth is expanded by utilizing the difference in the frequency at which the magnetic material and the resistive material have the strongest absorbing properties.

In a preferred embodiment, the magnetic absorbing coating layer comprises a polymeric resin and a magnetic filler distributed therein having a thickness of, for example, less than 15 mm such that the absorber structure can maintain a good weight to strength ratio.

Brief description of the drawing

DRAWINGS

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a absorber structure according to Embodiment 1 of the present invention;

2 is a schematic view showing a resistance shape and arrangement of a resistor sheet according to Embodiment 1 of the present invention;

3 is a schematic structural view of a absorber structure according to Embodiment 2 of the present invention;

4 is a schematic view showing the resistance shape and arrangement of one of the resistor sheets according to Embodiment 2 of the present invention; [0061] FIG. 5 is an absorption curve of the absorber structure according to Embodiment 2 of the present invention;

6 is a schematic structural view of a structure of a absorber according to another embodiment of the present invention;

7 and 8 are graphs showing the reflectance of the absorber structure for the TE wave and the TM wave, respectively, according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0064] The technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention. Throughout the description, it is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of the present invention.

[0065] It should be understood that, in describing a certain structure, when a layer or an area is referred to as being "above" or "above" another layer, another layer may be directly located on another layer or another area. The above, or other layers or regions are included between the other layer and another region. Also, if the structure is flipped, the one layer, one area will be located on the other layer, and the other area "below" or "below". In the case of describing a situation directly above another layer or another area, this article will use the expression "A directly above B" or "A is above and adjacent to B".

[0066] The present invention provides a absorber structure including a metal base plate and an electric loss body covering a surface of the metal base plate. Since the electric loss body has high dielectric loss, it is combined with a common low loss multilayer suction. Compared with the absorbing property of the absorbing material of the wave honeycomb, the absorbing structure of the present invention has a good absorbing effect in a wide frequency band, not only improves the absorbing property, but also reduces the structure of the entire absorbing body. The thickness and the low areal density of the absorber structure allow the absorbing structure of the present invention to be used in applications having load bearing and weight reduction requirements.

[0067] In an embodiment of the invention, the absorber structure comprises a layer of electrical loss bodies, or a plurality of layers of electrical loss bodies, wherein the plurality of layers of electrical loss bodies are closely superposed one after the other, and each layer of the electrical loss body is A honeycomb layer and a resistive layer superposed on the honeycomb layer are included. In the present invention, the absorbing cell is used instead of the low-density dielectric material, so that the electromagnetic wave incident into the absorbing structure is absorbed by the high-loss absorbing cell, thereby achieving the purpose of improving the absorbing performance. Compared with the structure of the absorber using ordinary honeycomb, the absorber of the absorbing honeycomb is smaller in thickness than the ordinary honeycomb absorber due to the dielectric loss of the intermediate layer.

[0068] In the absorber structure including a layer of electrical loss body, the electrical loss body comprises a honeycomb layer and a resistor sheet, wherein the resistor sheet is superposed on the honeycomb layer, and the other surface of the honeycomb layer is tightly connected to the metal substrate contact. The honeycomb layer includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet.

[0069] In the absorber structure including the multilayer electric loss body, each of the multilayer electric loss bodies includes a honeycomb layer, and a resistor sheet superposed on the honeycomb layer. In this absorber structure, a plurality of honeycomb layers and a plurality of resistor sheets are alternately stacked one on another. Each of the plurality of honeycomb layers includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. According to different design requirements The honeycomb structures in each honeycomb layer can be the same or different to meet different performance requirements.

[0070] Whether in an absorber structure comprising a layer of electrical loss bodies or in an absorber structure comprising a plurality of layers of electromagnetic loss bodies, each layer of honeycomb layers has a thickness between 1 mm and 100 mm. In a preferred embodiment, the plurality of honeycomb layers each have a thickness of 50 mm. Thereby, the obtained absorber structure has good absorbing properties and has a suitable thickness.

[0071] In the absorber structure provided by the present invention, each of the resistor sheets includes a support surface and a plurality of resistor blocks on the support surface. The support surface is located on the upper surface of the honeycomb layer below the corresponding resistive sheet layer. Each of the resistor sheets further includes a dielectric substrate underlying the respective resistor sheets to provide a support surface. In an embodiment, the sum of the resistance values of all the resistor blocks of each resistor layer may be the same or different. In a preferred embodiment, the incident surface of the electromagnetic wave is a surface on the electrical loss body and away from the metal base plate, and the sum of the resistance values of all the resistance blocks of the respective resistor sheets from the incident surface of the electromagnetic wave to the direction close to the metal base plate slowing shrieking. The plurality of resistor blocks in each of the resistor sheets are regularly polygonal or elliptical and are periodically arranged in an array, wherein the plurality of deformations may be selected from the group consisting of a rectangle, a triangle, a square, and the like. In other embodiments, the plurality of resistor blocks in each of the resistor layers may also be randomly arranged. In a preferred embodiment, at least one of the shape, size and distribution of the resistive blocks is different in different resistive sheets to provide a good absorbing effect over a wide frequency range.

[0072] The metal base plate is preferably one of a copper base plate, an aluminum base plate, a silver base plate or an iron base plate.

[0073] When the dielectric constant of the absorbing cell is chromatic, that is, the dielectric constant changes with frequency, its absorbing property is also related to the frequency. Therefore, in the present invention, in addition to changing the thickness of each layer of the absorbing honeycomb, the shape, size and distribution of the resistive block of each layer of the resistive structural layer, different absorbing absorbing cells can be used to design different absorbing bodies. The structure has expanded the design of the material.

Embodiment 1

[0075] As shown in FIG. 1, an absorber structure includes a metal base plate 1 and a layer of electric loss body 2 covering a surface of the metal base plate 1. The electric loss body 2 includes a honeycomb layer 21 and is superposed on the honeycomb layer 21. The resistor sheet 22 on one surface, and the other surface of the honeycomb layer 21 is in close contact with the metal substrate 1. The metal base plate 1 is a copper base plate, and the honeycomb layer 21 includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. The thickness of the honeycomb layer 21 is 100 mm. 2 is a top view of the resistor sheet 22. As shown in FIG. 2, the resistor layer 22 includes a dielectric substrate 221 under the resistor layer and four resistors on the surface of the dielectric substrate 221. Block 222, the dielectric substrate 221 provides a support surface for the four resistor blocks 222, wherein each of the resistor blocks 222 has a rectangular shape and is periodically arranged in an array.

[0076]

Example 2

[0078] As shown in FIG. 3, an absorber structure includes a metal base plate 1 and four layers of electric loss bodies 2 covering a surface of the metal base plate 1, each of which includes a honeycomb layer 21 and is superposed on The resistor sheet 2 2, the 4 layer honeycomb layer 21 and the 4 layer resistor sheet 22 on the honeycomb layer 21 are formed alternately stacked one on another. The metal base plate 1 is an aluminum base plate, and the honeycomb layer 21 includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. Each layer of the honeycomb layer 21 has a thickness of 50 mm. Starting from the metal substrate 1, the four layers of the resistor layer sequentially include a number of 4, 6, 5, and 7 elliptical resistor blocks 223, each of which is in the resistive layer. The elliptical resistor blocks 223 are randomly arranged, and the sizes of the resistor sheets in the different resistor sheets are different, and the sizes of the resistor blocks are the same in the same layer. 4 is a top view of the resistor sheet 22 closest to the metal substrate 1. As shown in FIG. 4, the resistor layer 22 includes a dielectric substrate 221 under the resistor layer 22 and four on the surface of the dielectric substrate 221. An elliptical resistor block 223, the dielectric substrate 221 provides a support surface for the four elliptical resistor blocks 223. Wherein, the sum of the resistance values of all the resistor blocks of each resistor layer is different, and the incident surface of the electromagnetic wave is on the surface of the electrical loss body and away from the metal base plate 1, and from the incident surface of the electromagnetic wave to the vicinity of the metal base plate 1. In the direction, the sum of the resistance values of all the elliptical resistor blocks 223 on the respective resistor sheets 22 gradually decreases.

Example 3

[0080] A absorbing body structure includes a metal bottom plate and four layers of electric loss bodies covering a surface of the metal base plate, each of the electric loss bodies including a honeycomb layer and a resistor layer superposed on the honeycomb layer, and a 4-layer honeycomb The layer and the 4-layer resistive sheets are formed by alternately stacking each other. The metal base plate is a silver base plate, and the honeycomb layer includes a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. The thickness of each layer of the honeycomb layer from the direction of the metal substrate is 1mm, 10mm. 50mm. 30mm, and each of the four layers of the resistor layer includes six triangular resistor blocks, and the triangular resistor blocks in each layer of the resistor layer The sizes vary, but they are all arranged in an array. Each of the resistor sheets includes a dielectric substrate under the resistive layer and six triangular resistor blocks on the surface of the dielectric substrate, the dielectric substrate providing a support surface for the six triangular resistor blocks. Wherein, the sum of the resistance values of all the triangular resistor blocks on each of the resistor layers is the same. Example 4

[0082] A absorbing body structure includes a metal bottom plate and six layers of electric loss bodies covering a surface of the metal base plate, each of the electric loss bodies including a honeycomb layer and a resistor layer superposed on the honeycomb layer, and a 6-layer honeycomb The layer and the 6-layer resistor sheets are formed by alternately stacking each other. The metal base plate is an iron base plate, and the honeycomb layer comprises a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. From the direction of the metal substrate, the thickness of each layer of the honeycomb layer is 30mm. Starting from the metal substrate, each of the 6 layers of the resistor layer includes 8 square resistor blocks, and the square in each layer of the resistor layer The resistor blocks vary in size and are arranged in a random arrangement. Each of the resistor sheets includes a dielectric substrate under the resistive layer and eight square resistor blocks on the surface of the dielectric substrate, the dielectric substrate providing a support surface for the eight square resistor blocks. Among them, the sum of the resistance values of all the square resistor blocks on each of the resistor layers is different.

Example 5

[0084] A absorbing body structure includes a metal bottom plate and two layers of electric loss bodies covering a surface of the metal base plate, each of the electric loss bodies including a honeycomb layer and a resistor layer superposed on the honeycomb layer, and two layers of cells The layer and the two layers of the resistor sheets are formed by alternately stacking each other. The metal base plate is a copper base plate, and the honeycomb layer comprises a polymer resin sheet and a honeycomb structure distributed on the polymer resin sheet. From the direction of the metal substrate, the thickness of each layer of the honeycomb layer is 100mm and 30mm respectively. Starting from the metal substrate, each of the two layers of the resistor layer includes four square resistor blocks, and each layer of the resistor layer The square resistor blocks are all the same in size, and are arranged in a periodic manner in a resistor block array in the resistor layer adjacent to the metal substrate layer, and the resistor blocks in the other resistor layer are randomly arranged. Each of the resistor sheets includes a dielectric substrate under the resistor layer and four square resistor blocks on the surface of the dielectric substrate, the dielectric substrate providing a support surface for the four square resistor blocks. Wherein, the sum of the resistance values of all the square resistor blocks on each of the resistor layers is different.

[0085] absorbing performance test

[0086] The absorbing properties of the absorber structure obtained in Example 2 were measured in an anechoic chamber by a method of measuring the wavelength band of 1 to 25 GHz.

5 is a absorbing curve of a absorbing body structure according to Embodiment 2 of the present invention. As can be seen from Fig. 5, the absorber structure having four layers of absorbing cells has good absorbing properties at various places between the wavelength bands of 1 and 25 GHz, and therefore, from the characterization of Fig. 5, the suction provided by the present invention is known. The wave body structure is an ultra-wideband absorber structure with good absorbing properties. [0088] The absorber structure provided by the present invention comprises a metal bottom plate and one or more layers of electrical loss bodies covering a surface of the metal base plate, each layer of the electrical loss body comprising a honeycomb layer and superimposed on the honeycomb layer The resistive sheet layer has a high dielectric loss, so that the absorber structure of the present invention has a good absorption in a wide frequency band as compared with the absorbing property of an ordinary low-loss multilayer absorbing microwave absorbing material. The wave effect not only improves the absorbing performance, but also reduces the thickness of the entire absorbing structure and the low surface density of the absorbing structure, so that the absorbing structure of the present invention can satisfy the bearing. And applications in the field of weight loss requirements.

In addition, FIG. 6 is a schematic structural view of a absorber structure 100 according to another embodiment of the present invention. The absorber structure 100 includes a metal base plate 110, a magnetic absorbing coating layer 120 on at least one surface of the metal base plate 110, and a plurality of honeycomb layers 131 to 13m and a plurality of resistor sheets 141 located above the metal base plate 110. Stacks formed by alternately stacking up to 14 m. In this embodiment, the magnetic absorbing coating layer functions as a magnetic loss body, and each of the honeycomb layers and the resistor sheets on the surface thereof serve as an electric loss body.

[0090] The incident direction and the reflection direction of the electromagnetic wave are shown by arrows in FIG. 6. As shown in Fig. 6, the incident surface of the electromagnetic wave is the upper surface of the absorber structure 100 (i.e., the upper surface of the resistor sheet 14m) opposed to the metal base plate 110.

The honeycomb layers 131 and 13m are each composed of a polymer resin. For example, an epoxy resin is used as a raw material to prepare a sheet by injection molding, and the injection molding temperature is 150 ° C and the daytime is 1 minute. The prepared sheet was placed in a roller press, the rolling teeth of the rolling machine were triangular, the rolling speed of the rolling machine was 5 rpm, and the temperature of the rolling machine was 130 ° C to form a honeycomb layer including a V-shaped structure. . In an alternative embodiment, any shape of rolled teeth can be used to form a honeycomb structure of any shape. The thickness of the honeycomb layers 131 to 13 m may be the same or different depending on the requirements of the absorbing properties.

[0092] The resistor sheets 141 to 14m respectively include a plurality of resistor blocks. The resistor block is composed of any suitable metal material, such as gold, silver, copper, aluminum or alloys thereof, or of any suitable non-metallic conductive material, such as: miscellaneous polysilicon, graphite, carbon nanotubes, indium tin oxide.

In the case where the surfaces of the honeycomb layers 131 to 13m are intact, the resistor sheets 141 to 14m may be formed directly on the surfaces of the honeycomb layers 131 and 13m. In the case where the honeycomb structures of the honeycomb layers 131 to 13m are exposed on the surface to cause the surface to be incomplete, a dielectric substrate may be separately formed on the honeycomb layers 131 to 13m to provide a support surface, and then a corresponding resistor sheet is formed on the dielectric substrate. Floor. The dielectric substrate can be any suitable The composition of the dielectric material, for example: glass fiber, ceramic, PTFE, ferroelectric material, ferrite material. The dielectric substrate is a commercially available dielectric substrate, such as a dielectric substrate of the type FR4, TP1.

The resistive sheets 141 to 14m may be formed on the support surface by any suitable process including, but not limited to, screen printing, laser engraving, and etching, preferably etching. The etching may be by dry etching, such as ion milling, plasma etching, reactive ion etching, laser ablation, or by selective wet etching using an etchant solution. A photoresist mask containing a specific pattern is formed on the surface of the conductive layer by photolithography prior to etching. A portion of the surface of the conductive layer is exposed in the pattern of the photoresist mask. Etching is then performed to remove the exposed portions of the conductive layer via the pattern pass. The photoresist mask is removed by dissolution or ashing in a solvent after etching. In an alternative embodiment, the conductive ink is printed on the support surface by screen printing to form the resistive sheets 141 to 14m.

[0095] The thickness of the honeycomb layers 131 to 13m may be the same or different from each other according to the demand of the absorbing property, and the thicknesses of the resistive sheets 141 to 14m may be the same or different from each other. In each of the resistor sheets, the shape and/or size of the resistor blocks may be the same or different. The resistor blocks can be distributed in any periodic form or randomly. The square resistance values of the resistor blocks may be the same or different between different resistor layers. The shape of the resistor block may be one selected from the group consisting of a polygon, a circle, or an ellipse, such as a square, a rectangle, a triangle, a quadrangle, and the like. In the example shown in Fig. 6, the resistor blocks are square and arranged in a row array in a periodic array. In a preferred embodiment, in the absorber structure 100, the resistance of the resistor sheet gradually decreases from the incident surface of the electromagnetic wave to the metal substrate. The electromagnetic wave is maximally entered into the absorber by changing the effective impedance along the thickness direction of the absorber to obtain the minimum reflection.

The absorber structure 100 according to an embodiment of the present invention includes the magnetic wave absorbing coating layer 120 on at least one surface of the metal base plate 110 as compared with the absorber structure according to the prior art. In the example of Fig. 6, the magnetic absorbing coating layer 120 is shown as being located on the upper surface of the metal base plate 110. The upper surface of the magnetic absorbing coating layer 120 is in close contact with the lower surface of the honeycomb layer 131, and the lower surface of the magnetic absorbing coating layer 120 is in close contact with the upper surface of the metal base plate 110.

[0097] In an alternative embodiment, the magnetic absorbing coating layer may be located on either or both of the upper and lower surfaces of the metal base plate 110 of the metal base plate 110. The thickness of the magnetic absorbing coating layer 120 is, for example, less than 15 mm, so that the weight of the absorber structure 100 is not significantly increased. Therefore, the absorber structure 100 can still maintain a good weight to strength ratio. [0098] The magnetic absorbing coating layer 120 is composed of, for example, a ferromagnetic material, for example, a coating material formed by dispersing a magnetic filler such as ferrite in a polymer resin. The magnetic absorbing coating layer 120 can achieve high magnetic loss. The magnetic absorbing coating layer 120 is applied at a position where the magnetic field is greatest, that is, near the surface of the metal ground plate 110. In the absorber structure 100 according to the embodiment of the present invention, the combination of the resistor sheets 141 to 14m and the magnetic absorbing coating layer 120 provides an absorbing material having both electrical loss and magnetic loss, thereby significantly improving absorption. The effect of electromagnetic waves.

7 and 8 are graphs showing the reflectance of the absorber structure for the TE wave and the TM wave, respectively, according to another embodiment of the present invention. In Figure 7, the reflectance of the absorber structure for the TE wave shows a reflection coefficient of -15 dB or less in the 5-20 GHz band, and the minimum reflection coefficient appears around 9 GHz, which is about -29 dB. The reflectance curve of the absorber structure in Fig. 8 shows a reflection coefficient of -15 dB or less in the 2.4-20 GHz band, and the minimum reflection coefficient appears around 9.75 GHz, which is about -38 dB, and in the low frequency band, for example. Around 3 GHz, the reflectance curve shows another valley with a corresponding reflection coefficient of about -24 dB. As is apparent from the graphs shown in Figs. 7 and 8, the absorber structure 100 according to the embodiment of the present invention not only significantly improves the effect of absorbing electromagnetic waves, but also expands the bandwidth and improves the absorbing effect at a low frequency band.

[0100] In the above description, well-known structural elements and steps have not been described in detail. However, those skilled in the art should understand that the various structural elements and steps can be implemented by various technical means. In addition, in order to form the same structural elements, those skilled in the art can also design a method that is not exactly the same as the method described above. In addition, although the respective embodiments have been separately described above, this does not mean that the measures in the respective embodiments are not advantageously used in combination.

[0101] Those of ordinary skill in the art will appreciate that the above embodiments are merely preferred embodiments of the present invention. The invention is not limited to the use in the examples.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

[Attach 1] A absorber structure, wherein the absorber structure comprises:

Metal base plate, and

An electrical loss body covering a surface of the metal base plate.

[Claim 2] The absorber structure according to claim 1, wherein the absorber structure comprises a layer of electrical loss bodies, and the power loss body comprises:

Honeycomb layer;

Resistor layer

Wherein, the resistor sheet layer is superposed on the honeycomb layer.

[Attachment 3] The absorber structure according to claim 1, wherein the absorber structure includes a multilayer electric loss body, and the multilayer electric loss bodies are closely superposed one upon another.

[Attachment 4] The absorber structure according to claim 3, wherein each of the multilayer electric loss bodies includes a honeycomb layer, and is superposed on the honeycomb layer Resistor layer.

[Attachment 5] The absorber structure according to claim 4, wherein, in the absorber structure, a plurality of the honeycomb layers and the plurality of the resistor sheets are alternately stacked one on another.

[Attachment 6] The absorber structure according to claim 4, wherein each of the resistor sheets includes a support surface and a plurality of resistor blocks on the support surface.

[Attachment 7] The absorber structure according to claim 6, wherein the support surface is located on an upper surface of the honeycomb layer below the corresponding resistor sheet layer.

[Attachment 8] The absorber structure according to claim 6, wherein each of the resistor sheets further includes a dielectric substrate under the corresponding one of the resistor sheets to provide the support surface.

[Attachment 9] The absorber structure according to claim 6, wherein a sum of resistance values of all of the resistor blocks of each of the resistor sheets is the same.

[Attachment 10] The absorber structure according to claim 6, wherein a sum of resistance values of all of the resistor blocks of each of the resistor sheets is different, and from an incident surface of the electromagnetic wave a sum of resistance values of all the resistor blocks of each of the resistor sheets gradually decreases in a direction close to the metal substrate, wherein an incident surface of the electromagnetic wave is at the electrical loss body Up and away from the surface of the metal base plate.

The absorber structure according to claim 6, wherein each of the plurality of resistor blocks has a regular polygonal shape or an elliptical shape.

An absorber structure, characterized in that: the absorber structure comprises:

Metal base plate

a magnetic loss body on the metal base plate;

At least one electrical loss body on the magnetic loss body.

The absorber structure according to claim 12, wherein the magnetic loss body is a magnetic absorbing coating layer, and a surface of the magnetic absorbing coating layer is in close contact with a surface of the metal base plate.

The absorber structure according to claim 13, wherein one of said at least one electric loss body is in close contact with the other surface of said magnetic absorbing coating layer.

The absorber structure according to claim 13, wherein the electric loss body comprises

Honeycomb layer;

Resistor layer

Wherein the resistor sheet layer is superposed on the honeycomb layer, and the honeycomb layer is in close contact with the other surface of the magnetic wave absorbing coating layer.

The absorber structure according to claim 13, wherein the absorber structure comprises a plurality of electric loss bodies, and the plurality of electric loss bodies are closely superposed one upon another.

The absorber structure according to claim 16, wherein each of said plurality of electric loss bodies comprises a honeycomb layer, and a resistor sheet layer superposed on said honeycomb layer.

The absorber structure according to claim 17, wherein in the absorber structure, a plurality of honeycomb layers and a plurality of resistor sheets are alternately stacked one on another.

The absorber structure according to claim 18, wherein each of the plurality of resistor sheets comprises a support surface and a plurality of resistor blocks on the support surface. [Claim 20] The absorber structure according to claim 19, wherein each of the plurality of resistor sheets further comprises a dielectric substrate under the corresponding resistor layer to provide The support surface.

[Claim 21] The absorber structure according to claim 19, wherein a total of resistance values of all the resistor blocks of each of the plurality of resistor sheets are different, and electromagnetic waves are obtained The incident surface is in a direction close to the metal substrate, and the sum of the resistance values of all the resistor blocks of the resistor layer gradually decreases.

[Attachment 22] The absorber structure according to claim 19, wherein the plurality of resistor blocks are each of a regular polygon or an ellipse.