Design of high roll‐off frequency selective surface based on single‐layer SIW cavity with fully canonical filtering responses

Abstract

Abstract In this paper, a novel design of high roll‐off frequency selective surface (FSS) is proposed based on a single‐layer substrate integrated waveguide (SIW) cavity. Fully canonical filtering responses with three transmission poles (TPs) and three transmission zeros (TZs) are obtained by employing transversal signal‐interference techniques (TSITs). The FSS unit cell can be regarded as a combined triple‐mode cavity consisting of one cross‐slot resonator and two SIW cavities. By using the filtering coupling matrix, the FSS can be well designed and analysed. Accordingly, to verify the design concept, a prototype is fabricated and experimented. Measured and simulated results are in good agreement, showing high performances in terms of high roll‐off and low profile.