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

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.