Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof

An electromagnetic shielding and ultra-broadband technology, which is applied in the field of transparent ultra-broadband strong electromagnetic shielding devices and its preparation, can solve the problems of insignificant improvement of shielding performance and reduction of light transmittance

Active Publication Date: 2021-05-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In short, most of the existing electromagnetic shielding composite structures directly stack multiple transparent conductive layers on the transparent substrate to improve the electromagnetic shielding efficiency. This design will lead to a significant decrease in light transmission, and the improvement in shielding performance is not obvious.

Method used

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  • Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof
  • Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof
  • Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] see figure 1 structure, the electromagnetic shielding device is composed of transparent conductive layer A (3), transparent medium A (4), spacer shielding layer (5), transparent film (6), transparent medium B (7), transparent conductive layer B(8) is assembled; the sheet resistance of the transparent conductive layers 3 and 8 is 4.2 ohms, and the conductivity is 1.7×10 7 S m -1 ; The transparent conductive layer is an oxide / metal / oxide three-layer structure composed of metal oxide and ultra-thin metal layer; the interval shielding layer is a silver metal grid, the square resistance is 2 ohms, and the conductivity is 1.4 ×10 7 S m -1 . The visible light transmittance of the transparent conductive layer is 90.5%, and the visible light transmittance of the spacer shielding layer is 87.4%.

[0086] The specific implementation method is as follows: firstly, the selected glass substrate is ultrasonically cleaned in ethanol, acetone cleaning solution and deionized water f...

Embodiment 2

[0089] see figure 1 structure, the electromagnetic shielding device is composed of transparent conductive layer A (3), transparent medium A (4), spacer shielding layer (5), transparent film (6), transparent medium B (7), transparent conductive layer B(8) is assembled; the sheet resistance of the transparent conductive layers 3 and 8 is 4.4 ohms, and the conductivity is 1.62×10 7 S m -1 ; The transparent conductive layer is an oxide / metal / oxide three-layer structure composed of a metal oxide and an ultra-thin metal layer; the interval shielding layer is a silver nanowire layer with a square resistance of 50 ohms and a conductivity of 1.0 ×10 6 S m -1 . The visible light transmittance of the transparent conductive layer is 90.6%, and the visible light transmittance of the interval shielding layer is 88.8%.

[0090] The specific implementation method is: on one side of the transparent glass substrate, the silver nanowire (the average diameter of the silver nanowire used is 3...

Embodiment 3

[0093] see figure 1 structure, the electromagnetic shielding device is composed of transparent conductive layer A (3), transparent medium A (4), spacer shielding layer (5), transparent film (6), transparent medium B (7), transparent conductive layer B(8) is assembled; the sheet resistance of the transparent conductive layers 3 and 8 is 4.6 ohms, and the conductivity is 1.55×10 7 S m -1 ; The transparent conductive layer is an oxide / metal / oxide three-layer structure composed of metal oxide and ultra-thin metal layer; the interval shielding layer is an ITO layer. The visible light transmittance of the transparent conductive layer is 90.2%, and the visible light transmittance of the interval shielding layer is 82.3%.

[0094] The specific implementation method is: the ITO film is plated on one side of the transparent glass substrate by magnetron sputtering. ITO is sputtered by DC power supply, the power is 50W, the thickness of ITO film is 100nm, the square resistance is 40Ω / s...

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Abstract

The invention provides a transparent ultra-wideband electromagnetic shielding device. The device is composed of transparent conducting layers arranged on the outer surfaces of transparent substrates and interval shielding layers arranged among the multiple layers of transparent substrates in an interlayer mode. Because the two transparent conductive layers symmetrically arranged on the outer surface of the substrate have strong reflectivity to microwave electromagnetic waves, a microwave Fabry-Perot (FP) interference cavity can be formed between the two transparent conductive layers. And the microwave Fabry-Perot Interference cavity formed by the transparent conductive layer on the outer surface can be equally divided into a plurality of cavity bodies by the single-layer or multi-layer interval shielding layer which is sandwiched between the plurality of layers of transparent substrates. On one hand, the effects of expanding the resonance period and increasing the shielding bandwidth can be achieved; and on the other hand, the microwave electromagnetic waves are subjected to multiple reflection in the plurality of Fabry-Perot interference cavities, so that the maximum attenuation is realized.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a transparent ultra-broadband strong electromagnetic shielding device and a preparation method thereof. Background technique [0002] With the increasing complexity of the electromagnetic environment, electromagnetic interference has become a serious problem in the fields of industry, commerce, science and military. The demand for faster signal transmission speed and greater data volume requires communication networks to work at higher and wider frequencies, such as the emerging 5G wireless communication. Conventional metallic materials and emerging graphene or MXene composites are ideal candidates for EMI shielding, but they are usually opaque, which limits their applications in optoelectronics. Although researchers have conducted extensive research on transparent electromagnetic shielding materials, it is still difficult to simultaneously achieve ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H05K9/00
CPCH05K9/002
Inventor宋伟杰袁昌卫鲁越晖黄金华李佳
OwnerNINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI