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Ultra-wideband wave-absorbing material and preparation method thereof

A wave-absorbing material and ultra-broadband technology, which is applied in the field of ultra-broadband absorbing materials and their preparation, can solve the problems of difficult processing of metal resistance composite multi-resonant ring layers, and achieve targeted improvement, good conductivity, and enhanced absorption effect Effect

Pending Publication Date: 2021-07-23
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the processing of metal resistance composite multi-resonant ring layers is difficult

Method used

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  • Ultra-wideband wave-absorbing material and preparation method thereof
  • Ultra-wideband wave-absorbing material and preparation method thereof
  • Ultra-wideband wave-absorbing material and preparation method thereof

Examples

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example 1

[0033]Example 1 Ultra-broadband absorbing material

[0034] The material is composed of a low-frequency absorbing layer and a high-frequency absorbing layer. The low-frequency absorbing layer is composed of a loss film and a single-layer surface film. The loss film is blown from microcrystalline graphite / polyethylene, and the content of microcrystalline graphite is 8. %wt, the loss film thickness is 0.08mm; the material of the surface film is carbon black / polylactic acid composite material, the content of microcrystalline graphite is 15-20%wt, it is screen printed, and the surface film unit pattern is a single layer of equal width stripes Composition, the stripe width is 0.7mm, the stripe spacing in the unit is 0.6mm, the spacing between the unit patterns is 1.2mm, and the surface film thickness is not more than 0.1mm. The high-frequency absorbing layer adopts two layers of 10mm-high rectangular through-hole frames (through-hole frames such as figure 2 , image 3 (shown) im...

example 2

[0035] Example 2 Ultra-broadband absorbing material

[0036] The material is composed of a low-frequency absorbing layer and a high-frequency absorbing layer. The low-frequency absorbing layer is composed of a loss film and several layers of surface films. The loss film is made of carbon black / polyethylene blow molding, and the carbon black content is 5%wt. , the thickness of the loss film is 1mm; the material of the surface film is carbon black / polylactic acid composite material, the content of microcrystalline graphite is 15-25%wt, and it is screen printed. The surface film unit pattern is composed of two layers of rectangular stripes, and the unit rectangle The size of the stripes is 4×3 mm, the spacing between unit patterns is 1-2 mm, and the thickness of the surface film is not greater than 0.1 mm. The high-frequency absorbing layer is composed of two layers of 10mm-high rectangular through-hole frame, impregnated and bonded. The size of the rectangular hole is 4×5 mm, an...

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Abstract

The invention relates to an ultra-wideband wave-absorbing material and a preparation method thereof. The ultra-wideband wave-absorbing material is composed of a low-frequency wave-absorbing layer and a high-frequency wave-absorbing layer, wherein the low-frequency wave-absorbing layer is composed of a loss film and a plurality of surface films incompletely covering the loss film, and the surface films are printed on the loss film through silk-screen printing or thermal transfer printing; the high-frequency wave-absorbing layer is formed by impregnating and curing at least two layers of through hole frames and then bonding and compounding the through hole frames in the height direction of through holes, the characteristic sizes of the through holes are in a range of 3-12 mm, the wall thickness of the through holes is in a range of 0.3-1 mm, the through hole frames are impregnated in thermosetting resin / absorbent composite slurry at least two times, the height of a single-layer through hole frame is 5-25 mm, and the height of the high-frequency wave-absorbing layer is 20-60 mm; and the low-frequency wave-absorbing layer and the high-frequency wave-absorbing layer are compounded to form the ultra-wideband wave-absorbing material. The wave-absorbing material is composed of a plurality of materials including the loss film, the surface films, each layer of through hole frame and an impregnation layer, so the electromagnetic characteristic distribution and the resonance characteristic of the wave-absorbing material can be adjusted more easily by adjusting the variety and the content of an absorbent in each part of the material, and matching between structure and material characteristics is perfectly realized.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material and a production method, in particular to an ultra-broadband wave absorbing material and a preparation method thereof. Background technique [0002] Absorbing materials eliminate or weaken the complex electromagnetic environment effects of systems, equipment, and components through physical reactions such as electricity, magnetism, and heat. They are important functional units of modern electronic information equipment. Radar absorbing materials can effectively suppress transmitted waves and reflected waves, so they are widely used in the fields of stealth, electromagnetic shielding and compatibility, and wireless communication. Traditional radar absorbing materials are usually composed of matrix materials and absorbers, and the absorbing performance mainly depends on the electromagnetic parameters and dispersion characteristics of the absorber. At present, commonly used absorbents ma...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H01Q15/00H05K9/00B41M1/12B41M5/382
CPCB41M1/12B41M5/382H01Q15/0086H01Q17/00H01Q17/007H05K9/0088
Inventor 谢炜曹太山罗奕兵余小峰杨添悦王鹏宇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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