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A broadband electromagnetic shielding layer

A technology of electromagnetic shielding layer and electromagnetic layer, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of poor flexibility, poor adhesion, and few research units of electromagnetic shielding coatings, and achieve the effect of solving poor adhesion

Active Publication Date: 2019-03-26
GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on electromagnetic shielding coatings with a frequency in the range of 100KHz to 1GHz has just started. There are few research units and a single variety, and serialization and industrialization have not yet been formed. Moreover, electromagnetic shielding coatings still have problems such as poor flexibility and poor adhesion, which limits the application of shielding coatings. Promote application

Method used

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  • A broadband electromagnetic shielding layer
  • A broadband electromagnetic shielding layer

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Embodiment 1

[0020] A broadband electromagnetic shielding layer, comprising a base material 1, a lower conductive layer 2, a middle electromagnetic layer 3, and an upper conductive layer 4; the upper conductive layer 4, the middle electromagnetic layer 3, the lower conductive layer 2, and the base material 1 from outside to inside cover in turn;

[0021] The base material 1 is rigid polyurethane foam;

[0022] The lower conductive layer 2 is pure aluminum, covered by thermal spraying process;

[0023] The middle electromagnetic layer 3 is covered by ferrite paint spraying;

[0024] The upper conductive layer 4 is sprayed with silver-clad copper conductive paint.

[0025] Using this setting, the electromagnetic shielding effectiveness test results are shown in Table 1.

[0026] Table 1 Electromagnetic shielding effectiveness test results

[0027]

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Abstract

The invention provides a broadband electromagnetic shielding layer, which comprises a substrate material, a lower conductive layer, a middle electromagnetic layer and an upper conductive layer, wherein the upper conductive layer, the middle electromagnetic layer, the lower conductive layer and the substrate material sequentially cover from the outside to the inside; the lower conductive layer is made of a high-electric conductivity material; the middle electromagnetic layer is made of a high-magnetic permeability material; and the upper conductive layer is made of the high-electric conductivity material. The broadband electromagnetic shielding layer can simultaneously meet the shielding effectiveness within a low-frequency range of 10KHz to 100KHz and a high-frequency range of 10KHz to 18GHz, and can well solve the problem of poor adhesive force of an electromagnetic shielding coating.

Description

technical field [0001] The invention relates to a broadband electromagnetic shielding layer and relates to the field of electromagnetic shielding materials. Background technique [0002] Rigid polyurethane foam has special characteristics such as light weight, flame retardancy, heat insulation, etc., and is now used in various fragile sealing covers, while the electromagnetic shielding test value of rigid polyurethane foam fragile covers is less than or equal to 3dB, No shielding performance. According to the frequency range of different fragile covers, the shielding effectiveness value is not less than 20dB in the frequency range of 10KHz~100KH, and the shielding effectiveness value is not less than 30dB in the frequency range of 100KHz~18GHz. According to the current domestic research on electromagnetic shielding rigid polyurethane foam, it is difficult to meet the requirements of use by adding shielding components to the foaming components. First, it increases the materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 汪鑫刘方辉陆璘饶安梅陈建平
Owner GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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