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Embedded composite meta-material absorber

A technology of metamaterials and absorbers, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems that high and low frequencies cannot be taken into account at the same time, and the thickness of low frequency absorbers is thick, so as to achieve the effect of retaining high frequency performance and strong absorption

Inactive Publication Date: 2015-11-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a broadband ultra-thin embedded composite metamaterial absorber with both high and low, so as to solve the problem that the low-frequency absorbing thickness of the existing magnetic absorbing material is too thick and cannot take into account both high and low frequencies

Method used

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  • Embedded composite meta-material absorber
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  • Embedded composite meta-material absorber

Examples

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Embodiment 1

[0040] The composite metamaterial absorber unit (CMA) is embedded in a square ring, and its structure diagram is shown in figure 1 As shown, from top to bottom are: metal pattern 1 , nested structure, and metal backplane 3 , wherein the nested structure includes a patterned dielectric substrate 3 and a patterned wave-absorbing material 4 . figure 2 for figure 1 Top and cross-sectional views of the structure shown. The upper layer of the composite superstructure is a metal pattern, its material is copper, and its electrical conductivity is 5.8×10 7 s / m, the thickness is 0.017mm, the shape is a square ring, the size of the ring is 18mm, and the line width is 0.2mm. The middle layer is composed of a square ring-shaped dielectric substrate and a patterned wave-absorbing material, and the patterned wave-absorbing material is embedded in the square-ring dielectric base. figure 1 The Chinese annular dielectric matrix material is FR-4, and its dielectric parameter is ε r =4.3(1-i...

Embodiment 2

[0042] A dielectric-based superstructure (SR) with ring-shaped embedded composite metamaterial absorber units is prepared on a metal backplane, and thefigure 1 The patterned absorbing material referred to in 4 is removed to obtain the following Figure 5 Cross-sectional view of the annular dielectric-based superstructure shown. The upper layer is a circular metal pattern, its external dimension is a=18mm, and the line width of the metal ring is 0.2mm; the middle layer is, the size of the square annular dielectric substrate is: a=18.2mm, b=15.6mm, and its dielectric parameter is ε r =4.3(1-i0.025); the bottom layer is a metal backplane. Both the metal backplane and the metal pattern material are copper, and its conductivity is 5.8×10 7 s / m, the thickness is 0.017mm. The square-ring dielectric-based superstructure was prepared by circuit printed board engraving technology, and its fitting and measured absorption properties are as follows: Figure 6 As shown, the dotted line i...

Embodiment 3

[0044] A patterned absorber (MP) with a circular embedded composite metamaterial absorber unit prepared on a metal backplane, the top view and cross-sectional view of the unit structure are shown in Figure 7 shown. It consists of a metal backplane and a block of absorbing material located above the metal backplane. The material of the metal backplane is copper, and its conductivity is 5.8×10 7 s / m, the thickness is 0.017mm, the back plate is square, and the side length is a=18.2mm; the size of the absorbing material block is b=15.6mm, the absorbing material thickness is 2mm, and the absorbing material block is surrounded by air. Firstly, the patterned wave-absorbing material is calculated by the equivalent medium theory, satisfying that the thickness is 2 mm, and the electromagnetic wave absorption rate is above 80% at 8-18 GHz. The electromagnetic parameter dispersion of the magnetic wave-absorbing material is calculated as follows: image 3 As shown, the dielectric real pa...

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Abstract

The invention discloses an embedded composite meta-material absorber. The absorber is composed of periodical unit structures. Each unit structure is composed of a dielectric based superstructure, a patterned absorbing material and a metal backboard, wherein the dielectric based superstructure is composed of a metal pattern and a dielectric body, and the patterned absorbing material is a seamless fit with the dielectric based superstructure and embedded into the dielectric body under the metal patter to form an embedded structure, and the embedded structure is combined with the metal board in the vertical direction to form one unit structure. Due the embedded structure design, the problem that a present absorbing material is low in the low-frequency absorbing performance in an ultrathin state is solved, the high-frequency performance of the magnetic absorbing material is maintained to the largest degree, and brand new design ideals and methods are provided for ultrathin low-frequency ultra-wide-band absorbers, intelligent adjustable wave absorption, and ultrathin, ultralow-frequency wave absorption in future.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a composite metamaterial absorber. Background technique [0002] Low-frequency electromagnetic radiation can cause cataracts, hearing loss, hair loss, cardiovascular disease, depression, suicide, and neurodegenerative diseases. Absorbing residual radiation microwaves through microwave-absorbing materials can effectively reduce the radiation intensity of electromagnetic waves and prevent large-scale radiation from harming life and health. hazards. At the same time, in the military field, low-frequency decimeter waves can be used to detect targets covered by trees, soil, and camouflage nets. The absorption of low-frequency microwaves through wave-absorbing materials has important practical significance for anti-reconnaissance. Thin thickness and wide absorption bandwidth are one of the trends in the development of absorbing materials, and broadband absorbing, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
Inventor 官建国杨进李维王维
Owner WUHAN UNIV OF TECH
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