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Broadband wave-absorbing metamaterial flexible sheet based on carbon-series material and preparation method of broadband wave-absorbing metamaterial flexible sheet

A flexible sheet, broadband technology, used in electrical components, magnetic/electric field shielding, antennas, etc., to reduce electromagnetic radiation, reduce the cross-sectional area of ​​radar scattering, and achieve electromagnetic compatibility

Pending Publication Date: 2022-01-11
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In general, there are few reports on flexible sheets of broadband absorbing metamaterials made of embedded carbon-based materials as periodic structural units in published patents and articles.

Method used

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  • Broadband wave-absorbing metamaterial flexible sheet based on carbon-series material and preparation method of broadband wave-absorbing metamaterial flexible sheet
  • Broadband wave-absorbing metamaterial flexible sheet based on carbon-series material and preparation method of broadband wave-absorbing metamaterial flexible sheet
  • Broadband wave-absorbing metamaterial flexible sheet based on carbon-series material and preparation method of broadband wave-absorbing metamaterial flexible sheet

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preparation example Construction

[0044] A method for preparing a flexible sheet of a broadband wave-absorbing metamaterial based on a carbon-based material, comprising the following preparation steps:

[0045] Step 1. The dielectric layer is divided into every other unit cell according to the unit size of the periodic resonant structure. P The size of the hole is mechanically punched in the shape of a double-layer concentric cylinder, and the diameter and height of the lower cylindrical hole are respectively w and t , the diameter and height of the upper cylindrical hole are y and x , see Figure 7 for the photo of the dielectric plate with the holes;

[0046] Step 2. Clean the small hole side of the dug-out dielectric plate with absolute ethanol, and apply metal materials such as copper film or aluminum film, or other materials with microwave total reflection ability as the reflective layer; this paste reflects The above steps can also be completed in the last step;

[0047] Step 3, stirring the graphene...

Embodiment 1

[0054] The broadband wave-absorbing metamaterial flexible patch based on carbon-based materials consists of a two-layer structure: the bottom layer is a metal reflective layer, and the upper layer is a 2.7mm dielectric layer. The dielectric layer is embedded with double-layer cylindrical carbon systems arranged periodically. The complex unit array, the structure diagram is as follows Figure 4 As shown, the electromagnetic wave is incident from the Z direction of the top layer; the embedded double-layer cylindrical carbon-based composite unit array uses a mixture of graphene powder and epoxy resin with a weight ratio of 15%, and the electromagnetic parameters are as follows: image 3 shown. The dimensions of the resonance unit are as follows: P = 13mm, x = 1.5mm, y = 4mm, t = 1.2mm and w =2.2mm, the dielectric board is polyester film (the relative dielectric constant is 3.8, the loss tangent is 0.03), the thickness of the dielectric board h = 2.7 mm; the reflective s...

Embodiment 2

[0058] The broadband wave-absorbing metamaterial flexible patch based on carbon-based materials includes a two-layer structure: the bottom layer is a copper film reflective layer, the upper layer is a 2.7mm polycarbonate film, and the dielectric layer is embedded with double-layer cylinders arranged periodically The unit array of carbon-based composites, the structure diagram is as follows Figure 4 As shown, the electromagnetic wave is incident from the Z direction of the top layer; the embedded double-layer cylindrical carbon-based composite unit array uses a mixture of graphene powder and polyurethane resin with a weight ratio of 15%. The dimensions of the resonance unit are as follows: P = 13mm, x = 1.5mm, y = 4mm, t = 1.6mm and w =2.2mm, the dielectric board is polycarbonate film (relative dielectric constant is 2.9, loss tangent is 0.01), the thickness of the dielectric board h = 3.1 mm; the reflective surface is a copper film (σ =5.8×107S / m), with a thickness of...

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Abstract

The invention provides a broadband wave-absorbing metamaterial flexible sheet based on a carbon material. The sheet comprises a reflecting layer and a dielectric layer embedded with periodically arranged structural units, and the dielectric layer is arranged above the reflecting layer. The preparation method of the broadband wave-absorbing metamaterial flexible sheet comprises the following preparation steps: according to the size of the periodic resonant structural units, for the dielectric layer, mechanically punching a hole in the shape of a double-layer concentric cylinder every other unit cell P; cleaning the small-hole surface of the dug dielectric plate with absolute ethyl alcohol, and pasting an upper reflecting layer on the small-hole surface of the dug dielectric plate; uniformly stirring graphene or carbon nanotubes with an adhesive to form a carbon compound for later use; filling the mixture into the periodically arranged holes in the step 1 by using a scraper; and naturally airing until the carbon-series compound is completely dried. According to the flexible sheet of the patent, the wave absorbing effect of a wide frequency band within the range of 2-18 GHz is achieved, the manufacturing process is simple, use is convenient, the flexible sheet can be attached to a measured object, and radar wave characteristic signals of a target object are effectively reduced.

Description

technical field [0001] The invention relates to the field of special functional materials, and relates to an artificial electromagnetic wave-absorbing material, which has the characteristics of light weight, flexibility, thin layer, and broadband wave-absorbing, and can be pasted on the outer surface of equipment to achieve electromagnetic compatibility, or applied to weapons The outer surface of the equipment has a radar stealth effect, and specifically relates to a carbon-based material-based broadband wave-absorbing metamaterial flexible sheet and a preparation method thereof. Background technique [0002] Metamaterials are a new type of artificial materials that have been vigorously developed at home and abroad in recent years. Through artificial design, extraordinary physical properties that do not exist in nature can be realized, and it also provides an unprecedented new idea for the development of wave-absorbing materials. Electromagnetic absorbing metamaterial is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q17/00H05K9/00
CPCH01Q15/0086H01Q15/0026H01Q17/00H05K9/0081
Inventor 庄海燕王晶晶陈翔叶志民洪岳辉
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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