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A wave-absorbing/wave-transmitting integrated material and its preparation method

A wave-transparent and metamaterial technology, applied in chemical instruments and methods, synthetic resin layered products, coatings, etc., can solve problems such as incompatibility with wave-transmission, narrow absorption frequency band, and large frequency-selective surface

Active Publication Date: 2022-04-22
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a wave-absorbing / wave-transmitting integrated material and its preparation method, which solves the problems of narrow absorption frequency band, incompatibility with wave-transmitting and frequency-selective surface of traditional coated wave-absorbing materials in the past.

Method used

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  • A wave-absorbing/wave-transmitting integrated material and its preparation method
  • A wave-absorbing/wave-transmitting integrated material and its preparation method
  • A wave-absorbing/wave-transmitting integrated material and its preparation method

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preparation example Construction

[0059] In a second aspect, the present invention provides a method for preparing the material, comprising the steps of:

[0060] (1) Preparation of metamaterials;

[0061] (2) providing a foam layer;

[0062] (3) Preparation of magnetic dielectric material film; and

[0063](4) Composite: Lay the magnetic dielectric film, foam material, and metamaterial to the specified thickness in sequence according to the design, bond, and cure to obtain a wave-absorbing / wave-transmitting integrated material.

[0064] Step (1): Step (1) is the step of preparing metamaterials. The metamaterial is preferably prepared by the following method:

[0065] (11) providing carbon nanotube slurry comprising carbon nanotube powder;

[0066] (12) scrape-coat the carbon nanotube slurry to form a film, and obtain a carbon nanotube coating film with a surface resistance of 5-20Ω after drying;

[0067] (13) Put the carbon nanotube coating film on the workbench of a laser etching instrument for vacuum a...

Embodiment 1

[0076] The wave-absorbing / wave-transmitting integrated material provided in this embodiment has a three-layer structure. The first layer is a metamaterial layer containing metamaterials, with a thickness of 0.13 mm. The second layer is PMI foam with a thickness of 3 mm. The third layer is The magnetic medium material layer including the ferrite magnetic medium material has a thickness of 4.4mm and is formed by paving and pasting the ferrite magnetic medium film. Among them, the metamaterial is a periodic structure etched on the carbon nanotube coating film, the surface square resistance of the carbon nanotube coating film is 10Ω, and the periodic structural unit is a regular hexagon with a side length of 12.5mm.

[0077] The preparation method comprises the following steps:

[0078] Step (1): Preparation of metamaterials

[0079] Weigh 20g of purified carbon nanotube powder into a 1000mL beaker, add 100g of distilled water, 0.5g of dispersant, and stir in a double planetary m...

Embodiment 2

[0088] The wave-absorbing / wave-transmitting integrated material provided in this embodiment has a three-layer structure. The first layer is a metamaterial layer containing metamaterials, with a thickness of 0.13 mm. The second layer is PMI foam with a thickness of 6 mm. The third layer is The magnetic medium material layer including the ferrite magnetic medium material has a thickness of 4.4mm and is formed by paving and pasting the ferrite magnetic medium film. Among them, the metamaterial is a periodic structure etched on the carbon nanotube coating film, the surface square resistance of the carbon nanotube coating film is 10Ω, and the periodic structural unit is a regular hexagon with a side length of 12.5 mm.

[0089] The preparation method comprises the following steps:

[0090] Step (1): Preparation of metamaterials

[0091] Weigh 20g of purified carbon nanotube powder into a 1000mL beaker, add 100g of distilled water, 0.5g of dispersant, and stir in a double planetary ...

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Abstract

The invention relates to a wave-absorbing / wave-transmitting integrated material and a preparation method thereof. The material includes a metamaterial layer comprising a metamaterial in turn; the metamaterial is a periodic structure etched on a carbon nanotube coating film, and the surface square resistance of the carbon nanotube coating film is 5-20Ω; a foam layer composed of a foam material; contains A layer of magnetic media material for a magnetic media material. In the present invention, a periodic structure pattern is formed by etching a nano-silver coating film with a certain impedance to form a metamaterial with a certain impedance, and then the metamaterial is used as a surface layer to be sequentially integrated with a foam layer and a magnetic medium material layer to form a broadband Wave-absorbing / wave-transmitting integrated material, the reflectivity of the composite material is ≤-5dB at 3-10GHz, the wave-transmission rate is ≥-2dB at 18-20GHz, and has polarization insensitivity.

Description

technical field [0001] The invention relates to the technical field of broadband wave-absorbing / wave-transmitting integrated materials, in particular to a wave-absorbing / wave-transmitting integrated material and a preparation method thereof. Background technique [0002] With the development of microwave technology, the system has higher and higher requirements for the electromagnetic shielding performance of microwave antennas. Not only do materials need to transmit waves within the antenna working frequency band, but also need to absorb broadband waves outside the antenna working frequency band. Traditional wave-absorbing materials such as ferrite, carbonyl iron powder, metal micropowder, etc., can only have wave-absorbing performance in a narrow frequency range, and do not have wave-transmitting performance. The frequency selective surface can realize wave transmission in the working frequency band of the antenna and reflection in other frequency bands, but requires a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/28B32B5/18B32B27/30B32B27/18B32B27/08B32B27/38B32B7/12B32B7/025B32B33/00B32B37/12B32B38/16B32B38/00B29C41/30
CPCB32B9/007B32B9/046B32B9/00B32B27/308B32B27/18B32B27/065B32B27/38B32B7/12B32B7/025B32B33/00B32B37/1284B32B38/164B32B38/00B29C41/30B29C41/003B32B2266/0214B32B2307/212B32B2307/20
Inventor 杨智慧孙新贺军哲张久霖赵轶伦于海涛
Owner BEIJING INST OF ENVIRONMENTAL FEATURES