Transparent broadband electromagnetic wave absorber based on ITO resistive film

Abstract

The invention discloses a transparent broadband electromagnetic wave absorber based on an ITO resistive film, which belongs to the technical field of electromagnetic materials and comprises an upper glass substrate, a lower glass substrate, ITO periodic units etched on the two glass substrates and having different sheet resistance values, and a middle transparent glass substrate, the periodic unit structure is a square ring patch, and the square ring patch is a layer of thin film formed by etching ITO with square resistance on a glass substrate. The middle layer selects glass for impedance matching to achieve the purpose of transparency, ITO with sheet resistance is completely etched on the bottom layer glass substrate, and the bottom layer ITO can be regarded as a metal reflecting plate due to the fact that the sheet resistance of the bottom layer ITO is very small, and the conductivity of the bottom layer ITO is close to that of a perfect metal conductor. The wave absorber realized by the resistive ITO and the glass breaks through the limitation that the traditional wave absorber is opaque and narrow in bandwidth, the application scene is widened, and the wave absorber has important application prospects in the aspects of electromagnetic shielding, cockpits with requirements on light transmittance and the like.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic materials, and in particular relates to a transparent broadband electromagnetic wave absorber based on an ITO resistance film. Background technique [0002] Electromagnetic absorber (EMA) is an important electromagnetic device, which plays a very important role in the fields of electromagnetic compatibility, electromagnetic stealth, and information security. With the rapid development of science and technology, various electronic components produce a large amount of electromagnetic radiation of different frequencies, which puts forward higher requirements for the performance, size, angular stability and other indicators of the absorber. EMA has been increasingly widely used due to its advantages such as high absorption rate and flexible design. [0003] The prototype of the EMA was first proposed by the American researcher Winfield Salisbury in 1952, the SalisburyScreen, which consists of...

AI Technical Summary

Problems solved by technology

With the emergence of transparent absorbers, various transparent electromagnetic absorbers with new structures have been proposed one after another, and their functions and performance have also been improved, from the initial absorption of single-frequency incident electromagnetic waves to the gradual design of Electromagnetic absorbers with dual frequency points, multi-frequency points, and wide frequency bands can be realized, and the absorber initially has the disadvantages of being sensitive to the polarization and angle of incidence of incident electromagnetic waves, but with the subsequent structural optimization design, it slows down. slow to overcome these deficiencies

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