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A broadband electromagnetic wave absorbing metamaterial based on the fusion of foam dielectric matrix material and metal structure

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

Active Publication Date: 2021-01-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A broadband electromagnetic wave absorbing metamaterial based on the fusion of foam dielectric matrix material and metal structure
  • A broadband electromagnetic wave absorbing metamaterial based on the fusion of foam dielectric matrix material and metal structure

Examples

Experimental program
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Embodiment 1

[0036] The base material was selected as carbon foam. Mesh size 1mm, conductivity 0.7s / m-1s / m, 200×200mm foam board, board thickness 20mm, processed into 20×20×10mm square foam material; the square foam material is made of polyimide with thickness 2μm Film wrap, epoxy the foam blocks to a 0.5mm thick FR4 dielectric base plate with a 2mm spacing between the foam blocks and place them into the mold. Mix the phenolic resin, p-toluenesulfonic acid and hollow glass beads with a particle size of 10-50 μm in a weight ratio of 88:2:10, fill the mixture in the gap between the foams, and place the mixture and the above-mentioned foam assembly in the mold The hot-pressing compounding was completed, and the compounding conditions were 90° C. temperature control, 9 MPa pressure applied, and maintained for 3 hours. The square metal ring covers the top of the FR4 dielectric substrate. The thickness of the square metal ring structure is 30μm. The outer length of the square metal ring is 40mm...

Embodiment 2

[0039] The selected base material is silicon carbide foam. Select 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 a thickness of 3μm, and use epoxy resin to stick the foam block on On the 0.5mm thick FR4 dielectric base plate, the foam block spacing is 3mm, and put it into the mold. Mix the phenolic resin, p-toluenesulfonic acid and hollow glass microspheres with a particle size of 10-40 μm in a weight ratio of 88:2:10, fill the mixture in the gap between the foams, and place the mixture and the above-mentioned foam assembly in the mold The hot-pressing compounding was completed, and the compounding conditions were 90° C. temperature control, 9 MPa pressure applied, and maintained for 3 hours. The square metal ring covers the top of the FR4 dielectric substrate. The thickness of the square metal ring structure is 38μm. The outer length...

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, the use of wireless electronic communication technology has become more and more frequent, and the problems of electromagnetic interference and pollution have become prominent, affecting daily life; in the field of military applications, with the improvement of radar detection technology, new requirements for stealth performance are also put forward, 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 uniform dielectric materials such as carbon and silicon carbide, and uniform magnetic materials such as iron, silicon, aluminum, and ferrite as the absorbin...

Claims

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Application Information

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Patent Type & Authority Patents(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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