阅读说明：本技术 一种错位型立体式超材料透明吸波体 (Dislocation type three-dimensional metamaterial transparent wave absorber ) 是由 齐聪慧 杨伟 郭奕 董秀成 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种错位型立体式超材料透明吸波体,若干结构单元在二维上呈周期性连续分布,每个结构单元包括上层结构和下层结构,上层结构包括错位排列成两排的中空柱体单元,第一排包括存在间隙排布的、两个完整的中空柱体单元,第二排包括依次排布的中空柱体单元的右半侧结构、一个完整的中空柱体单元和中空柱体单元的左半侧结构,三者存在一定间隙排布；下层结构包括基板层和背板层；中空柱体结构的侧壁作为支撑层、其内侧用于附着导电薄膜层；结构单元采用透明材料制成。本发明通过能与空间电磁波产生多谐振的二维立体式中空柱体单元排布结构,使吸波体具有宽频带吸波的特性,从而解决目前的吸波体无法兼顾宽带吸波与高可见光透过率的问题。(The invention discloses a dislocation type three-dimensional metamaterial transparent wave absorber, wherein a plurality of structural units are periodically and continuously distributed in two dimensions, each structural unit comprises an upper layer structure and a lower layer structure, the upper layer structure comprises hollow cylinder units which are arranged in two rows in a dislocation way, the first row comprises two complete hollow cylinder units which are arranged in a clearance way, the second row comprises a right half structure of the hollow cylinder units, one complete hollow cylinder unit and a left half structure of the hollow cylinder units which are arranged in sequence, and the three structures are arranged in a certain clearance way; the lower layer structure comprises a substrate layer and a back plate layer; the side wall of the hollow column structure is used as a supporting layer, and the inner side of the hollow column structure is used for attaching a conductive film layer; the structural unit is made of transparent materials. According to the invention, through the two-dimensional three-dimensional hollow cylinder unit arrangement structure capable of generating multiple resonances with spatial electromagnetic waves, the wave absorber has the characteristic of broadband wave absorption, so that the problem that the existing wave absorber cannot take broadband wave absorption and high visible light transmittance into consideration is solved.)

1. The staggered three-dimensional metamaterial transparent wave absorber comprises a plurality of structural units (1), wherein the structural units (1) are periodically and continuously distributed in two dimensions, and the staggered three-dimensional metamaterial transparent wave absorber is characterized in that each structural unit (1) comprises an upper layer structure and a lower layer structure, the upper layer structure comprises hollow cylinder units (11) which are staggered into two rows, the first row comprises two complete hollow cylinder units (11) which are arranged in a gap, the second row comprises a right half side structure of the hollow cylinder units (11) which are sequentially arranged, one complete hollow cylinder unit (11) and a left half side structure of the hollow cylinder unit (11), and the three are arranged in a certain gap;

The lower layer structure comprises a substrate layer (12) and a back plate layer (13), the back plate layer (13) is attached to the outer side of the substrate layer (12), and the hollow cylinder units (11) are fixed to the inner side of the substrate layer (12);

The hollow cylinder unit (11) is in a rotational symmetry regular N-edge hollow cylinder structure, wherein N is an even number and is more than or equal to 4; the side wall of the hollow cylinder structure is used as a support layer (111), and the inner side of the hollow cylinder structure is used for attaching a conductive film layer (112);

the structural unit (1) is made of transparent materials.

2. The dislocation type three-dimensional metamaterial transparent wave absorber according to claim 1, wherein more than 20 structural units (1) are continuously distributed in two dimensional directions.

3. The dislocation type three-dimensional metamaterial transparent wave absorber according to claim 1, wherein a plurality of structural units are distributed in a rectangular array; and the right half side structure of the hollow cylinder unit (11) on one structural unit (1) and the left half side structure of the adjacent hollow cylinder unit (11) on the same straight line are spliced into a complete hollow cylinder unit (11).

4. the staggered three-dimensional metamaterial transparent wave absorber according to claim 1, wherein the included angle between the axial direction of the hollow cylinder units (11) and the plate surface of the substrate layer (12) is 90 degrees, and the hollow cylinder structure is a cube, a honeycomb prism or a cylinder structure.

5. The dislocation type three-dimensional metamaterial transparent wave absorber as claimed in claim 1, wherein the gap between adjacent hollow cylinder units (11) in the same plane is S, and the requirement that S is more than or equal to 0.3 λ and more than or equal to 0.1 λ is satisfied, wherein λ is the shortest wavelength λ of wave absorbing frequency band_min。

6. the offset type three-dimensional metamaterial transparent wave absorber according to claim 1 or 5, wherein the ruler of the structural unit (1)The size p is more than or equal to 2 lambda, and the lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

7. the offset type three-dimensional metamaterial transparent absorber according to claim 1 or 5, wherein the maximum dimension L of the hollow cylindrical unit (11) in the polarization direction of the electric field is: l is more than or equal to 1.2 lambda and more than or equal to 0.6 lambda; the height h of the hollow cylinder unit (11) is 1.5 lambda, more than or equal to h and more than or equal to 0.6 lambda, wherein lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

8. The offset three-dimensional metamaterial transparent absorber according to claim 7, wherein the thickness of the support layer (111) is as follows: w is more than or equal to 0.06 lambda and more than or equal to 0.02 lambda, and the thickness of the conductive film layer (112) is g₀＝0.001λ。

9. the offset three-dimensional metamaterial transparent absorber according to claim 1, wherein the thickness of the back plate layer (13) is: g₁0.005 λ; the thickness of the substrate layer (12) is d ═ 0.01 lambda, and lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

10. The staggered three-dimensional metamaterial transparent absorber according to claim 1, wherein the substrate layer (12) and the support layer (111) are made of transparent inorganic materials; the back plate layer (13) and the conductive film layer (112) adopt transparent conductive films, the transparent conductive films adopt continuous conductive films, and the conductivity of the transparent conductive films is 10²S/m～10⁵S/m。

Technical Field

The invention relates to the technical field of electromagnetic metamaterials, in particular to a dislocation type three-dimensional metamaterial transparent wave absorber.

Background

the wave-absorbing material is a material capable of absorbing electromagnetic wave energy projected to the surface of the wave-absorbing material, and the metamaterial wave-absorbing body is widely applied to the fields of electromagnetic compatibility and the like due to the unique perfect absorption characteristic of the metamaterial wave-absorbing body. Some special electronic and electrical devices require absorption capability for electromagnetic waves and corresponding light transmission capability for visible light, but a conventional wave absorber cannot have both wave-absorbing and transparent performances, for example, a three-dimensional unit broadband periodic wave-absorbing structure provided in patent CN105101764A cannot give consideration to both broadband wave-absorbing and high visible light transmittance. With the development of scientific technology, in the research of electromagnetic wave-absorbing materials in the microwave field, the development of wave-absorbing materials meeting the requirements of 'thin, light, wide and strong' performance and simultaneously meeting the requirement of high light transmittance in the visible light range is urgently needed.

disclosure of Invention

The technical problem to be solved by the invention is as follows: the invention provides a dislocation type three-dimensional metamaterial transparent wave absorber which solves the problem that a conventional wave absorber cannot take broadband wave absorption and high visible light transmittance into consideration, and is particularly suitable for a visual window component with specific absorption and shielding requirements on electromagnetic waves.

The invention is realized by the following technical scheme:

A dislocation type three-dimensional metamaterial transparent wave absorber comprises a plurality of structural units, wherein the structural units are periodically and continuously distributed in two dimensions, each structural unit comprises an upper layer structure and a lower layer structure, the upper layer structure comprises hollow cylinder units which are arranged in two rows in a dislocation mode, the first row comprises two complete hollow cylinder units which are arranged in a clearance mode, the second row comprises a right half structure of the hollow cylinder units, a complete hollow cylinder unit and a left half structure of the hollow cylinder units which are arranged in sequence, and the three structures are arranged in a certain clearance mode;

The lower layer structure comprises a substrate layer and a back plate layer, the back plate layer is attached to the outer side of the substrate layer, and the hollow cylinder units are fixed on the inner side of the substrate layer;

The hollow cylinder unit is in a rotationally symmetric regular N-edge hollow cylinder structure, wherein N is an even number and is more than or equal to 4; the side wall of the hollow cylinder structure is used as a supporting layer, and the inner side of the hollow cylinder structure is used for attaching a conductive film layer;

The structural unit is made of transparent materials.

Furthermore, the wave absorber is provided with more than 20 structural units in continuous distribution in two dimensional directions.

furthermore, a plurality of structural units are distributed in a rectangular array; and the right half side structure of the hollow cylinder unit on one structural unit and the left half side structure of the adjacent hollow cylinder unit on the same straight line are spliced into a complete hollow cylinder unit.

Furthermore, the included angle between the axial direction of the hollow cylinder unit and the surface of the substrate layer is 90 degrees, and the hollow cylinder structure adopts a cube, a honeycomb prism or a cylindrical structure.

Furthermore, the gap between adjacent hollow cylinder units in the same plane is S, and the requirement that S is more than or equal to 0.3 lambda and more than or equal to 0.1 lambda is met, wherein lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

furthermore, the size p of the structural unit is more than or equal to 2 lambda, wherein lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

Further, the maximum dimension L of the hollow cylinder unit in the electric field polarization direction is: l is more than or equal to 1.2 lambda and more than or equal to 0.6 lambda; the height h of the hollow cylinder unit is 1.5 lambda, more than or equal to h and more than or equal to 0.6 lambda, wherein lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

Further, the thickness of the support layer is: w is more than or equal to 0.06 lambda and more than or equal to 0.02 lambda, and the thickness of the conductive film layer is g₀0.001 λ, wherein λ is the shortest wavelength λ of the wave-absorbing frequency band_min。

Further, the thickness of the back plate layer is: g₁0.005 λ; the thickness of the substrate layer is d ═ 0.01 lambda, and lambda refers to the shortest wavelength lambda of the wave-absorbing frequency band_min。

Further, the substrate layer and the support layer are made of transparent inorganic materials; the back plate layer and the conductive film layer are transparent conductive films, the transparent conductive films are continuous conductive films, and the conductivity of the transparent conductive films is 10²S/m～10⁵S/m。

The invention has the following advantages and beneficial effects:

1. According to the invention, through the two-dimensional three-dimensional hollow cylinder unit arrangement structure capable of generating multiple resonances with spatial electromagnetic waves, the wave absorber has the characteristic of broadband wave absorption, so that the problem that the existing wave absorber cannot take broadband wave absorption and high visible light transmittance into consideration is solved. Different from the wave-absorbing characteristics of the traditional wave-absorbing material (electric loss, magnetic loss and dielectric loss type material), the invention not only has good electromagnetic absorption characteristics, but also has good light transmittance characteristics; the absorption rate of the wave absorber in the frequency band of 2.9 GHz-28.8 GHz is more than 90%, and the light transmittance of the wave absorber in the wavelength range of 430 nm-800 nm can be more than 80% through the light transmittance test;

2. The wave absorber provided by the invention has wave absorbing performance of incoming wave wide angle incidence and wave absorbing characteristic of polarization insensitivity. As in the xoy plane, for example, the electromagnetic waves are incident at different polarization angles, i.e., the electric field polarization direction of the electromagnetic wavesWhen the wave absorbing body is incident under different angles with the x axis or the y axis, the absorption characteristic of the wave absorbing body is basically unchanged. Namely, the wave absorber has the wave absorbing characteristic of polarization insensitivity; the wave absorber provided by the invention is a hollow cylinder with depth height as a whole, taking the yoz plane as an example, the wave propagation directionwhen the incident angle between the wave absorbing body and the z axis is 0-55 degrees, the absorption curve of the wave absorbing body to electromagnetic waves is basically consistent, namely, the wave absorbing body has the wave absorbing performance of incoming wave width angle incidence;

3. Compared with the wave absorbers arranged in parallel arrays, the staggered arrays on the integral display position of the wave absorber provided by the invention can reduce the coupling inductance capacitance between each structural unit and can increase the effective size of the hollow cylinder unit, so that the low-frequency resonance frequency point is reduced, the low-frequency absorption characteristic is expanded, and the lowest absorption rate is more than 90% at 2.9 GHz; the three-dimensional wave-absorbing integral design provided by the invention ensures that the wave absorber not only has stability of physical structure, attractive appearance and light weight, but also can effectively eliminate the defect that the corresponding single-layer wave-absorbing structure is easy to generate total reflection by absorbing incident electromagnetic waves through the side resistive film of the three-dimensional unit structure, improve the wave-absorbing characteristic of intermediate frequency, and have a plurality of resonance peaks, so that the wave absorber has good strong wave-absorbing characteristic in medium and high frequency bands.

in conclusion, the dislocation type three-dimensional wave absorber provided by the invention solves the problem that broadband wave absorption and high visible light transmittance cannot be considered at the same time, and is particularly suitable for a visual window component with specific absorption and shielding requirements on electromagnetic waves.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic diagram of a staggered three-dimensional periodic array model of wave absorbers according to the present invention;

FIG. 2 is a schematic diagram of a structural unit of the wave absorber of the present invention;

FIG. 3 is a wave-absorbing curve of the dislocation type three-dimensional wave absorber of the present invention;

FIG. 4 is a light transmittance curve of the dislocation type three-dimensional wave absorber of the present invention.

Reference numbers and corresponding part names in the drawings: 1-structural unit, 11-hollow column unit, 111-supporting layer, 112-conductive film layer, 12-substrate layer, and 13-back plate layer.

Parameters in the drawing are defined as follows:

Wherein p is defined as the size of the structural unit;

Wherein L is defined as the maximum size of the hollow cylinder unit in the electric field polarization direction;

Wherein h is defined as the height of the hollow cylinder unit;

Wherein s defines a gap between adjacent hollow cylinder units in the same plane;

Wherein w is defined as the thickness of the support layer;

Wherein d is defined as the thickness of the substrate layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.