An Optically Transparent Broadband Electromagnetic Absorption Structure with Adjustable Absorbing Amplitude

Abstract

The invention discloses an optically transparent broadband electromagnetic absorption structure with adjustable wave absorption amplitude. A first dielectric substrate layer, a first graphene layer, a diaphragm layer, a second graphene layer and a second dielectric substrate layer form a sandwich structure. The first graphene layer and the second graphene layer have good adjustable surface resistance properties and good light transmittance in the microwave frequency band. By adding a bias voltage, the first graphene layer and the second graphene layer can achieve surface The resistance value is adjusted from 2000Ω / sq‑200Ω / sq to adjust the wave absorption amplitude of the entire wave absorbing structure. The first indium tin oxide layer and the second indium tin oxide layer act as dielectric loss layers respectively, and the third indium tin oxide layer acts as a shield The reflective layer, together with the sandwich structure, satisfies the transmission theory of the transmission line; the advantage is that the absorption amplitude can be adjusted by adjusting the graphene surface resistance. It has optical transparency and also has a wide range of adjustable absorption amplitude and relative bandwidth. Wider absorbing characteristics, better absorbing effect.

Description

Technical field [0001] The present invention involves a broadband electromagnetic absorption structure, especially a broadband electromagnetic absorption structure that involves an optical transparent absorption amplitude. Background technique [0002] Electromagnetic stealth technology is widely used in military equipment and electronic confrontations, which has a significant role in improving the survivability of airfields such as aircraft ships. The purpose of electromagnetic stealth technology is to reduce the radar scattering characteristics of their own goals to achieve low detection of their own goals. One of its main technical ways is to use electromagnetic absorption structure with electromagnetic absorption function to absorb the radar wave energy on the surface of the equipment. Reduce radar scattering cross -sectional area, thereby realizing the stealth of the radar frequency band. [0003] In recent years, with the diversification of detection methods and spectrum of...

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Problems solved by technology

[0004] The electromagnetic absorption structures with broadband absorbing frequency that have appeared at present mainly use periodic unit structures of different sizes to achieve multi-frequency point selective absorption, so as to achieve broadband absorption, such as Qihui Zhou's Multi-Frequency Broadband Terahertz Metamaterial A broadband electromagnetic absorption structure is disclosed in Absorber Based on Graphene. Although the broadband electromagnetic absorption structure has a broadband absorbing frequency, it uses opaque metal and electronic components and cannot be applied to areas that require optical transparency, such as portholes. Electromagnetic stealth in other parts, and other application fields that require optical transparency, and it cannot adjust the absorption amplitude, the absorption situation is single, and the absorption effect is general

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