Transparent bidirectional wave-absorbing electromagnetic shielding device with graphene and double-layer metal grid

Abstract

The invention, which belongs to the technical field of electromagnetic shielding of an optical transparent element, provides a graphene / double-layer-metal-mesh--included transparent electromagnetic shielding device with a bidirectional wave absorbing effect. The electromagnetic shielding device employs a metal mesh A and a metal mesh B as transparent reflection layers; 1 to 6 layers of graphene films separated by transparent mediums are used as transparent absorption layers A and B; and the transparent absorption layers A and B are arranged at the two sides of transparent reflection layers. On the basis of organic combination of low reflection and partial microwave absorption characteristics of the graphene film with the strong electromagnetic reflection characteristic of the high-light-transmittance dual-layer metal mesh, radio-frequency radiation at two sides of the device can pass through the absorption layers by multiple times and thus can be absorbed strongly to realize bidirectional strong shielding and low reflection characteristics and visible light only passes through the multi-layer structure once to realize high light transmittance. With the electromagnetic shielding device, problems that bidirectional strong electromagnetic shielding, high light transmission and low electromagnetic reflection can not be realized simultaneously by the existing transparent electromagnetic shielding method can be solved; and thus the electromagnetic shielding device has characteristics of bidirectional high light transmittance, strong electromagnetic shielding, and low electromagnetic reflection.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding of optical transparent parts, in particular to a graphene / double-layer metal grid transparent electromagnetic shielding device with bidirectional wave absorption. Background technique [0002] With the development of radio, television, wireless communication technology and microwave technology, a large number of radio frequency devices are equipped in various places of human activities, and the spectrum range continues to widen, and the intensity doubles, which not only interferes with electronic equipment, but also affects human health. threaten. This invisible and intangible "electromagnetic pollution" directly acts on machines or human bodies, and is a serious "invisible killer". It has become the fifth largest pollution after air pollution, water pollution, solid waste pollution and noise pollution. Electromagnetic shielding (including absorption and reflection) is the main measure to...

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Problems solved by technology

[0020] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing transparent electromagnetic shielding technology, especially for the mutual restriction of transparency and conductive shielding ability in the existing reflective transparent shielding technology, it is difficult to take into account high light transmittance and strong microwave shielding efficiency, and reflective electromagnetic shielding technology In order to solve the problem of electromagnetic leakage and secondary pollution caused by signals, a graphene / double-layer metal grid transparent electromagnetic shielding device with two-way absorbing effect has been developed to achieve two-way strong electromagnetic shielding, high light transmission and low electromagnetic reflection performance. Purpose

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