A visibly transparent, microwave ultra-wideband absorber structure

By employing a multi-layer transparent conductive pattern with a gradient impedance design, the impedance matching problem of existing microwave absorbing materials in the 1-40GHz frequency band is solved, achieving ultra-wideband microwave absorption and visible light transparency. This makes it suitable for spacecraft optical windows and solar panels, and it is adaptable to the space environment.

CN122370740APending Publication Date: 2026-07-10ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2026-04-03
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing microwave absorbing materials cannot simultaneously achieve ultra-wideband high absorption, high visible light transmittance, and adaptability to space environments. In particular, it is difficult to achieve good impedance matching in the 1-40GHz frequency band. Furthermore, traditional materials are opaque in the visible light band and cannot be applied to critical components such as optical sensor windows.

Method used

A multilayer transparent conductive pattern impedance gradient absorption structure is designed, including a space protection layer, an impedance gradient absorption layer, and a total reflection bottom layer. By alternately stacking transparent conductive oxide thin films and low dielectric constant transparent dielectric substrates, continuous impedance matching and broadband absorption across the 1-40 GHz frequency band are achieved, and materials such as SiO2 are used to resist the space environment.

Benefits of technology

It achieves ultra-wideband microwave absorption in the 1-40GHz frequency band with subwavelength thickness, maintains high visible light transmittance, and has the ability to withstand the space environment, making it suitable for spacecraft optical windows and solar panels.

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Abstract

This invention discloses a visible transparent, ultra-wideband microwave absorption structure, comprising, from top to bottom, a visible transparent spatial shielding layer, an impedance-gradient absorption layer, and a total reflection bottom layer. The spatial shielding layer is highly transparent to the microwave band. The impedance-gradient absorption layer is composed of multiple layers of low-dielectric-constant transparent dielectric substrates and an array of transparent conductive patterns disposed thereon, stacked alternately. The total reflection bottom layer is totally reflective to the microwave band. By precisely designing the gradient period and equivalent resistance of the multilayer transparent conductive pattern array, and utilizing the electromagnetic coupling and multi-point resonance mechanism of the upper and lower layers, this invention achieves ultra-wideband microwave strong absorption of more than 90% in the 1-40 GHz frequency band at the subwavelength scale, breaking through the bandwidth limitation bottleneck of traditional microwave absorbing structures; and it also possesses excellent visible light transparency characteristics.
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