A broadband flexible microwave‐optical compatible absorber

Abstract

AbstractIn this paper, a broadband flexible absorber for compatible microwave‐optical absorption is proposed. The absorber consists of two polyvinyl chloride (PVC) substrates and three resistive layers made of conductive carbon black (CCB). Two CCB layers are employed as the frequency‐selective surface to achieve microwave absorption while the third one ensures high optical absorption. The PVC substrates provide the structure with good flexibility. An equivalent circuit model is presented to analyze broadband microwave absorption. Finally, the proposed structure is fabricated and tested. The total thickness of the absorber is only 4.05 mm. Simulation and measurement results show the proposed structure process wideband absorption over 90% in the frequency range from 6.24 to 19.8 GHz. The proposed absorber also shows a high‐efficient absorption in an optical band from 220 to 2500 nm. Experimental results verify the proposed absorber possesses compatible microwave‐optical absorption. In addition, the proposed structure possesses compactness and flexibility characteristics, making it easy to conform which indicates its promising applications in stealth areas.