An ultrathin polarization insensitive frequency selective surface for wide stop band RF applications

Abstract

In this paper, a compact, polarization insensitive, wide stop band frequency selective surface (FSS) has been proposed to serve C, X and Ku band applications. The unit cell of the proposed FSS consists of the combination of square loop and Jerusalem cross dipole elements to achieve wide stop band with a -10 dB bandwidth of 15.96 GHz from 5.45 GHz to 21.41 GHz. The periodicity and overall thickness of the structure are 0.32 λ₀ and 0.04 λ₀, respectively. The proposed design is polarization insensitive and provides a wide stop band response for large angles of incident wave with TE or TM polarization. Equivalent circuit analysis has also been performed to verify the simulated results. A prototype of proposed structure has been fabricated and experimentally tested. The measured results have been observed in agreement with the simulated results.