A transparent ultra-wideband electromagnetic shielding device

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: 2022-07-12
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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  • A transparent ultra-wideband electromagnetic shielding device
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  • A transparent ultra-wideband electromagnetic shielding device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] see figure 1 Structure, the electromagnetic shielding device consists of a transparent conductive layer A (3), a transparent medium A (4), a spaced shielding layer (5), a transparent film (6), a transparent medium B (7), a transparent conductive layer arranged in sequence and arranged in parallel 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 a metal oxide and an ultra-thin metal layer; the spaced shielding layer is a silver metal grid, the sheet 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 embodiment is as follows: firstly, the selected glass substrate is ultrasonically cleaned in ethanol, ac...

Embodiment 2

[0089] see figure 1 Structure, the electromagnetic shielding device consists of a transparent conductive layer A (3), a transparent medium A (4), a spaced shielding layer (5), a transparent film (6), a transparent medium B (7), a transparent conductive layer arranged in sequence and arranged in parallel 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 spacer shielding layer is a silver nanowire layer, the sheet resistance is 50 ohms, and the conductivity is 1.0 ×10 6 S m -1 . The visible light transmittance of the transparent conductive layer was 90.6%, and the visible light transmittance of the spacer shielding layer was 88.8%.

[0090] The specific implementation is as follows: on one side of a transparent glass substrate, silver nanowires wi...

Embodiment 3

[0093] see figure 1 Structure, the electromagnetic shielding device consists of a transparent conductive layer A (3), a transparent medium A (4), a spaced shielding layer (5), a transparent film (6), a transparent medium B (7), a transparent conductive layer arranged in sequence and arranged in parallel 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 an ultra-thin metal layer; the interval shielding layer is an ITO layer. The visible light transmittance of the transparent conductive layer was 90.2%, and the visible light transmittance of the spacer shielding layer was 82.3%.

[0094] The specific implementation is as follows: ITO film is coated on one side of the transparent glass substrate by magnetron sputtering. ITO is sputtered by DC power supply, the power is 50W, the thic...

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Abstract

The invention provides a transparent ultra-wideband electromagnetic shielding device, which is composed of a transparent conductive layer arranged on the outer surface of a transparent substrate, and an interval shielding layer sandwiched between multiple transparent substrates. Since 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 them. The single-layer or multi-layer spacer shielding layer sandwiched between the multi-layer transparent substrates can evenly divide the microwave Fabry-Perot interference cavity composed of the outer surface transparent conductive layer into multiple cavities. On the one hand, it can extend the resonance period and increase the shielding bandwidth; on the other hand, microwave electromagnetic waves are reflected multiple times in multiple Fabry-Perot interference cavities to achieve maximum attenuation.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, in particular to a transparent ultra-wideband 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 industrial, commercial, scientific and military fields. The need for faster signal transmission speeds and larger data volumes requires communication networks to operate at higher and wider frequencies, such as emerging 5G wireless communications. Conventional metallic materials and emerging graphene or MXene composites are ideal for EMI shielding, but they are often opaque, which limits their application in optoelectronics. Although researchers have conducted extensive research on transparent electromagnetic shielding materials, it is still difficult to achieve the goals of high visible light transmittan...

Claims

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Application Information

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Patent Type & AuthorityPatents(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