A Thin and Broadband Absorbing Metamaterial

A metamaterial and broadband technology, which is applied in the field of light and thin broadband absorbing metamaterial structure and design, can solve the problems of complex preparation process of multilayer absorbing metamaterials, inability to realize broadband and high-efficiency absorbing, and achieve good symmetry and absorption peak The effect of stable frequency position and good absorption stability

Active Publication Date: 2020-12-08
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems that the current microwave absorbing metamaterials are difficult to use in a relatively thin thickness, especially the single-layer metamaterial absorbing structure cannot achieve broadband and high-efficiency absorbing, and the preparation process of multilayer absorbing metamaterials is complicated.

Method used

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  • A Thin and Broadband Absorbing Metamaterial
  • A Thin and Broadband Absorbing Metamaterial
  • A Thin and Broadband Absorbing Metamaterial

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Experimental program
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Effect test

Embodiment 1

[0041] refer to figure 1 The microwave-absorbing metamaterial structure includes a bottom metal plate, an intermediate dielectric substrate, and a metal film layer with a periodic configuration on the surface. The bottom metal plate and the surface metal film layer are made of copper metal, the thickness is 0.035mm, and its conductivity is 5.96×107S / m; the intermediate dielectric substrate is made of FR4, the thickness is 2.8mm, and the dielectric constant is 4.3 (1+0.025i) .

[0042] Morphology reference of surface periodic units figure 2As shown, the period P of the unit is 9.2mm. The surface metal film layer is composed of a cut square metal sheet and two circular metal sheets. The length L of the square metal sheet is 8.28mm. The square metal sheet is cut with two pairs of circles whose center is located on the diagonal. The center of the circle is O1 The relative position to the unit cell center O is (-2.42mm, 2.42mm), and the radius r1 is 3.3mm; the relative position...

Embodiment 2

[0045] refer to figure 1 The structural form of the microwave-absorbing metamaterial, the bottom metal plate and the surface metal film layer are made of copper metal, the thickness is 0.035mm; the intermediate dielectric substrate is made of FR4, the thickness is 2.9mm; the period P of the surface periodic unit is 9.18mm, and the square metal sheet The length L is 8.26mm, and the square metal sheet is cut with two pairs of circles whose center is located on the diagonal. The relative position of the circle center O1 and the unit cell center O is (-2.42mm, 2.42mm), and the radius r1 is 3.3mm ; The relative position between the circle center O2 and the unit cell center O is (-3.63mm, -3.63mm), and the radius r2 is 2.0mm. The two circular metal sheets in the unit are located on the diagonal of the cut square metal sheet, the center of the circle is also at O1, and the radius r3 is 2.5mm.

[0046] Figure 9 is the absorption rate of the metamaterial in the case of normal incide...

Embodiment 3

[0048] refer to figure 1 The structure of the wave-absorbing metamaterial, the bottom metal plate and the surface metal film layer are made of copper metal with a thickness of 0.035mm; the intermediate dielectric substrate is made of FR4 with a thickness of 2.4mm; the period P of the surface periodic unit is 9mm. The length L of the square metal sheet is 8.1mm, and the square metal sheet is cut with two pairs of circles whose center is located on the diagonal. The relative position of the circle center O1 and the unit cell center O is (-2.42mm, 2.42mm), and the radius r1 is 3.3mm; the relative position of the circle center O2 and the unit cell center O is (-3.63mm, -3.63mm), and the radius r2 is 2.0mm. The two circular metal sheets in the unit are located on the diagonal of the cut square metal sheet, the center of the circle is also at O1, and the radius r3 is 1.3mm.

[0049] Figure 13 is the absorption rate of the metamaterial in the case of normal incidence of electromag...

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Abstract

The present invention provides a design of a light and thin broadband wave absorbing metamaterial. The structure of the broadband wave absorbing metamaterial comprises a bottom copper metal plate, anintermediate FR4 dielectric substrate and a copper metal film layer having a periodic configuration on the surface. The unit cell structure of the metal film layer is composed of a cut square metal sheet and two circular metal sheets. The absorption rate of electromagnetic wave in the whole frequency band is higher than 90% under vertical polarization and horizontal polarization in the response band of X (8-12GHz) and Ku (12-18GHz), the absorption rate of oblique incident electromagnetic waves up to 40 degrees in the X-band is over 80%, and the wide incidence angle and the high efficiency absorption characteristics can be realized. The design has the characteristics of simple design method, easy adjustment of wave absorbing performance, low thickness, insensitivity to polarization and wideincident angle and the like, has great feasibility of practical application and has wide application in the field of X, Ku microwave band wide-band stealth material, wave absorbing skin, wave absorbing device and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic functional materials, and in particular relates to a light and thin broadband wave-absorbing metamaterial structure and design method. Background technique [0002] Radar absorbing materials can effectively absorb incident electromagnetic waves and reduce target echo intensity, which is an important technical approach for radar wave stealth of weapons, equipment and special devices. For radar absorbing materials to achieve excellent absorbing performance, two conditions must be met at the same time: first, the surface impedance of the absorbing material must match the wave impedance of free space to ensure that electromagnetic waves can enter the interior of the material; second, the absorbing material must With proper loss, the electromagnetic energy can be efficiently dissipated. But these two requirements are often contradictory. Materials with higher losses have lower impedance, while materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0086H01Q17/008
Inventor 邹春荣沈同圣郭少军周晓松汪涛黎松
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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