Miniaturised band‐absorptive frequency selective rasorbers with wide absorption band

Abstract

Miniaturised band-absorptive frequency selective rasorbers (FSRs) with wide absorption bands for single-polarised and dual-polarised applications are proposed here. These FSRs are both constructed by a lossy layer and a lossless layer, in which I-type metal strips are utilised to reduce the size of the unit cell of the FSRs. The equivalent circuit models (ECM) of the FSRs are presented and analysed. A prototype of the dual-polarised band-absorptive FSR is fabricated, assembled, and tested. The measured results show that a wide absorption band (| S 21 |≤–10 dB and | S 11 |≤–10 dB) from 3.93 GHz to 8.07 GHz with a bandwidth of 69%, and a low-pass band (| S 21 |≥–1 dB) with frequency lower than 880 MHz has been achieved for the dual-polarised band-absorptive FSR.