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Broadband electromagnetic wave absorption super material based on fusion of foam medium-based material and metal structure

A metal structure and base material technology, applied in electrical components, antennas, etc., can solve the problems of high density, poor electromagnetic wave absorption effect, and large thickness, and achieve the effect of simple structure and favorable engineering application.

Active Publication Date: 2019-04-19
INST OF METAL RESEARCH - CHINESE ACAD OF 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 provide a broadband electromagnetic wave absorbing metamaterial based on the fusion of foam dielectric base material and metal structure, so as to solve the problems of poor broadband and low frequency band electromagnetic wave absorption effect, large thickness and high density of existing wave absorbing materials

Method used

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  • Broadband electromagnetic wave absorption super material based on fusion of foam medium-based material and metal structure
  • Broadband electromagnetic wave absorption super material based on fusion of foam medium-based material and metal structure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The selected base material is carbon foam. A foam board with a mesh diameter of 1mm, an electrical conductivity of 0.7s / m-1s / m, 200×200mm, and a thickness of 20mm is processed into a 20×20×10mm square foam material; the square foam material is made of polyimide with a thickness of 2μm Wrap the film, glue the foam block on the 0.5mm thick FR4 dielectric bottom plate with epoxy resin, and put the foam block at a distance of 2mm, and put it into the mold. Mix phenolic resin with a weight ratio of 88:2:10, p-toluenesulfonic acid, and hollow glass microspheres with a particle size of 10-50 μm, fill the mixture in the gaps between the foams, and form the mixture with the above foam combination in the mold Completion of hot-press lamination, the lamination conditions are temperature control at 90°C, application of pressure at 9MPa, and keeping for 3 hours. The square metal ring is covered on the FR4 dielectric substrate. The thickness of the square metal ring structure is 30 ...

Embodiment 2

[0039] The selected base material is silicon carbide foam. Choose mesh aperture 4mm, resistivity 10 3 -10 10 Ω·m, 200×200mm foam board, thickness 20mm; processed into 50×50×15mm square foam material; wrap the square foam material with polyimide film with thickness 3μm, and glue the foam block with epoxy resin A 0.5mm thick FR4 dielectric bottom plate with a foam block spacing of 3mm is placed into the mold. Mix phenolic resin with a weight ratio of 88:2:10, p-toluenesulfonic acid and hollow glass microspheres with a particle size of 10-40 μm, fill the mixture in the gaps between the foams, and combine the mixture with the above foam in the mold Completion of hot-press lamination, the lamination conditions are temperature control at 90°C, application of pressure at 9MPa, and keeping for 3 hours. The square metal ring is covered on the FR4 dielectric substrate. The thickness of the square metal ring structure is 38 μm. The outer side length of the square metal ring is 36 mm, ...

Embodiment 3

[0042] The selected base material is sendust foam. Select a foam board with a mesh aperture of 2 mm, a particle size of 80 μm, and a thickness of 20 mm, and process it into a square foam material of 30 × 30 × 15 mm; wrap the square foam material with a polyimide film with a thickness of 3 μm, Use epoxy resin to glue the foam block on the 1mm thick FR4 dielectric bottom plate, the distance between the foam blocks is 5mm, and put it into the mold. Mix phenolic resin with a weight ratio of 88:2:10, p-toluenesulfonic acid and hollow glass microspheres with a particle size of 15-40 μm, fill the mixture in the gaps between the foams, and combine the mixture with the above foam in the mold Completion of hot-press lamination, the lamination conditions are temperature control 80°C, applied pressure 9MPa, and keep for 3 hours. The square metal ring covers the FR4 dielectric substrate, the thickness of the square metal ring structure is 25 μm, the outer side length of the square metal r...

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Abstract

The invention discloses a broadband electromagnetic wave absorption super material based on fusion of a foam medium-based material and a metal structure, and belongs to the technical field of electromagnetic wave absorption. The super material is composed of foam materials with different shapes and pore diameters and metal structures with different structural sizes. The combined metamaterial structure utilizes the advantages of light foam materials, large scattering loss, strong interface polarization loss and low impedance, and fully utilizes the flexible and controllable characteristics of the absorbing frequency band of the metal metamaterial structure so that the maximum flat reflectance of the metamaterial in the whole frequency range of 1-18 GHz is reduced to below 10 dB, and the flat panel reflectance of the key frequency band is reduced to below 15 dB, the surface density is less than 8kg / m2, and the super material has a good broadband electromagnetic wave absorption performance. The super material can achieve wide-band radar stealth, can solve the problems of narrow bands, large thickness and high surface density of the absorbing materials in the prior art, and achieves effective electromagnetic wave absorption.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption, in particular to a broadband electromagnetic wave absorption metamaterial based on the fusion of a foam dielectric base material and a metal structure. Background technique [0002] In recent years, wireless electronic communication technology has been used more and more frequently, and electromagnetic interference and pollution problems have become prominent, affecting daily life; in the field of military applications, with the improvement of radar detection technology, new requirements have been put forward for stealth performance, so the problem of stealth is solved The performance of electromagnetic wave absorbing materials also needs to be improved. [0003] Traditional stealth materials generally use dielectric uniform materials such as carbon and silicon carbide, and magnetic uniform materials such as sendust and ferrite as the wave-absorbing matrix, but they face p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 张劲松李万崇李处森林立海
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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