Wide-frequency-band wave-absorbing high-strength metamaterial

Abstract

The invention discloses a wide-frequency-band wave-absorbing high-strength metamaterial which comprises a plurality of stacked frequency-absorbing units, and each frequency-absorbing unit is composed of a plurality of composite material layers with absorption frequency bands gradually increased in sequence. The composite material layers are divided into a plurality of low-frequency wave-absorbing material layers and a plurality of high-frequency wave-absorbing material layers according to different absorption frequency bands; the low-frequency wave-absorbing material layer and the high-frequency wave-absorbing material layer both take resin as a base material. According to the invention, the wave-absorbing structure realized by the low-frequency wave-absorbing material layer and the high-frequency wave-absorbing material layer respectively realizes the absorption work of high-frequency and low-frequency electromagnetic wave energy, and realizes the application under the requirement of relatively wide frequency band; the high-absorptivity frequency absorbing device has the technical advantages of being high in absorptivity, wide in absorbable frequency band, simple in frequency absorbing structure and low in manufacturing cost, can be well applied to actual work, and has wide generalizability.

Description

Technical Field

[0001] The present invention belongs to the technical field of metamaterials, and relates to a broadband absorbing and high-strength metamaterial. Background Art

[0002] With the development of electromagnetic wave technology and the wide application of communication products, the problems of electromagnetic radiation, electromagnetic scattering and electromagnetic compatibility have become increasingly prominent. The application of absorbing materials provides an effective method to solve this problem. Absorbing materials can generally be divided into structural absorbing materials and coating absorbing materials. Among them, the coating absorbing materials are mainly prepared by spraying, with simple structure and thin thickness, but usually have poor manufacturing accuracy and it is difficult to design the internal structure; the structural absorbing materials are mainly manufactured by molding or cutting, and have a series of problems such as low absorption rate, narrow frequency band and high cost, which greatly limit their practical application scope. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0004] A broadband absorbing and high-strength metamaterial includes a plurality of stacked frequency-absorbing units, and each frequency-absorbing unit is composed of multiple composite material layers with sequentially increasing absorption frequency bands;

[0005] According to different absorption frequency bands, each composite material layer is divided into a plurality of low-frequency absorbing material layers and a plurality of high-frequency absorbing material layers;

[0006] Both the low-frequency absorbing material layer and the high-frequency absorbing material layer use resin as the matrix material;

[0007] The low-frequency absorbing material layer further includes: low-frequency absorbing material accounting for 30% - 45% of the volume of the low-frequency absorbing material layer;

[0008] The high-frequency absorbing material layer further includes: high-frequency absorbing material accounting for 40% - 50% of the volume of the low-frequency absorbing material layer.

[0009] As a further scheme of the present invention: in order to improve the structural strength of each frequency-absorbing unit, a plurality of metal layers are provided in each sucker unit, and the metal layers are interspersed between the composite material layers at a certain distance interval.

[0010] As a further scheme of the present invention: the metal layer is composed of a metal material, including but not limited to one metal or an alloy composed of multiple metals such as Al, Ti, Au, Ag, Cu, Mo, W, etc.

[0011] As a further scheme of the present invention: the resin adopts any one or a mixture of several of ethyl cyanoacrylate, bisphenol A epoxy resin, bisphenol F epoxy resin or polyphenolic epoxy resin.

[0012] As a further solution of the present invention: the low-frequency wave-absorbing material is one or a mixture of more materials among FeSi particles, FeSiAl fine particles, and FeCo alloy powder.

[0013] As a further solution of the present invention: the high-frequency wave-absorbing material is carbonyl iron particles.

[0014] As a further solution of the present invention: graphene or a mixture of carbon nanotubes and an adhesive is filled between each stacked frequency-absorbing unit to form a graphene resistance layer.

[0015] As a further solution of the present invention: in the graphene resistance layer, the ratio of graphene to carbon nanotubes is 2:0.5, and graphene and carbon nanotubes account for 20% - 30% of the total weight volume of the graphene resistance layer.

[0016] The beneficial effects of the present invention: The wave-absorbing structure realized by the present invention through the low-frequency wave-absorbing material layer and the high-frequency wave-absorbing material layer respectively realizes the absorption of high-frequency and low-frequency electromagnetic wave energy, and realizes the application under the requirement of a relatively wide frequency band; it has the technical characteristics of high absorption rate, wide absorbable frequency band, simple frequency-absorbing structure, and low cost, and can be well applied to actual work, with wide popularization. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the present invention. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be understood that the present application is not limited by the example embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0020] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0021] Please refer to Figure 1 , in an embodiment of the present invention, a wide-band absorbing high-strength metamaterial includes a plurality of stacked frequency-absorbing units 1, and each frequency-absorbing unit 1 is composed of multiple composite material layers 11 with sequentially increasing absorption frequency bands. The absorption frequency band covers 1 GHz to 18 GHz, and it can achieve the absorption of electromagnetic waves in a super-wide frequency range;

[0022] In different absorbing scenarios, the thickness and filtering ability of the structural absorber can be changed by adjusting the number of each composite material layer 11 in the frequency-absorbing unit 1;

[0023] In each composite material layer 11, according to different absorption frequency bands, it is divided into a plurality of low-frequency absorbing material layers (absorbing the 1 GHz to 2 GHz frequency band) and a plurality of high-frequency absorbing material layers (absorbing the 2 GHz to 18 GHz frequency band);

[0024] Among them:

[0025] Both the low-frequency absorbing material layer and the high-frequency absorbing material layer use resin as the matrix material; the resin is any one or a mixture of several of ethyl cyanoacrylate, bisphenol A epoxy resin, bisphenol F epoxy resin or polyphenolic epoxy resin.

[0026] The low-frequency absorbing material layer further includes: low-frequency absorbing material accounting for 30% to 45% of the volume of the low-frequency absorbing material layer; the low-frequency absorbing material is a mixture of one or more of FeSi particles, FeSiAl fine particles and FeCo alloy powder;

[0027] The high-frequency absorbing material layer further includes: high-frequency absorbing material accounting for 40% to 50% of the volume of the low-frequency absorbing material layer; the high-frequency absorbing material is carbonyl iron particles; materials with the same performance characteristics can also be selected;

[0028] The absorption of high-frequency and low-frequency electromagnetic wave energy is respectively realized through the low-frequency absorbing material layer and the high-frequency absorbing material layer, so as to realize the application under the requirements of a relatively wide frequency band.

[0029] Furthermore, in order to improve the structural strength of each frequency absorption unit 1, a plurality of metal layers 12 are provided in each sucker unit. The metal layers 12 are interspersed between the composite material layers 11 at a certain distance interval. By enhancing the overall structural strength of the frequency absorption unit 1 through the metal layers 12, it can effectively prevent the situation where the frequency absorption function of the frequency absorption unit 1 fails due to puncture or scratching.

[0030] The metal layer 12 is composed of a metal material, including but not limited to an alloy composed of one or more metals among Al, Ti, Au, Ag, Cu, Mo, W, etc.

[0031] Furthermore, a mixture of graphene or carbon nanotubes and an adhesive is filled between the stacked frequency absorption units 1. Through this mixture, the frequency absorption units 1 are tightly combined, and a graphene resistance layer 2 is formed. By cooperating with each composite material layer 11 through the graphene resistance layer 2, a full-band wave absorption effect is achieved.

[0032] In the graphene resistance layer 2, the ratio of graphene to carbon nanotubes is 2:0.5, and graphene and carbon nanotubes account for 20% - 30% of the total weight and volume of the graphene resistance layer 2.

[0033] It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A broadband absorbing high-strength metamaterial, characterized in that, It includes a plurality of stacked frequency absorption units, and each frequency absorption unit is composed of multiple composite material layers with sequentially increasing absorption frequency bands; According to different absorption frequency bands, each composite material layer is divided into a plurality of low-frequency wave-absorbing material layers and a plurality of high-frequency wave-absorbing material layers; Both the low-frequency wave-absorbing material layer and the high-frequency wave-absorbing material layer use resin as the matrix material; The low-frequency wave-absorbing material layer further includes: low-frequency wave-absorbing material accounting for 30% - 45% of the volume of the low-frequency wave-absorbing material layer; The high-frequency wave-absorbing material layer further includes: high-frequency wave-absorbing material accounting for 40% - 50% of the volume of the low-frequency wave-absorbing material layer.

2. The broadband wave-absorbing and high-strength metamaterial according to claim 1, characterized in that, In order to improve the structural strength of each frequency absorption unit, a plurality of metal layers are provided in each sucker unit, and the metal layers are interspersed between the composite material layers at a certain distance interval.

3. The broadband wave-absorbing high-strength metamaterial according to claim 1, wherein The metal layer is composed of a metal material, including but not limited to an alloy composed of one or more of metals such as Al, Ti, Au, Ag, Cu, Mo, W, etc.

4. A broadband absorbing and high-strength metamaterial according to claim 1, wherein The resin adopts any one or a mixture of several of ethyl cyanoacrylate, bisphenol A epoxy resin, bisphenol F epoxy resin or polyphenolic epoxy resin.

5. A broadband absorbing and high-strength metamaterial according to any one of claims 1 or 4, characterized in that The low-frequency wave-absorbing material is a mixture of one or more of FeSi particles, FeSiAl fine particles and FeCo alloy powder.

6. A broadband absorbing and high-strength metamaterial according to any one of claims 1 or 4, characterized in that, The high-frequency wave-absorbing material is carbonyl iron particles.

7. A broadband wave-absorbing and high-strength metamaterial according to any one of claims 1 or 4, characterized in that, Between each stacked frequency absorption unit, graphene or a mixture of carbon nanotubes and an adhesive is filled to form a graphene resistance layer.

8. The broadband wave-absorbing and high-strength metamaterial according to claim 1, wherein In the graphene resistance layer, the ratio of graphene to carbon nanotubes is: 2:0.5, and graphene and carbon nanotubes account for 20% - 30% of the total weight volume of the graphene resistance layer.

Images