An FSS-Backed Dual-Band Reflective Polarization Conversion Metasurface

In this paper, a novel design of a co-polarized transmission window within the cross-polarized reflection band of a polarization converted meta-surface (PCM) is presented. First, a dual-band reflective polarization converted meta-surface is designed. In each band, the incoming linearly-polarized electromagnetic wave will be efficiently reflected with its cross-polarized state. The two bands are separated by a co-polarized reflective band. Second, a pass-band frequency selective surface (FSS) with the high-selective response is constructed. Its operating pass-band is positioned in the same range as the co-polarized reflective band of the PCM. Third, the reflected PCM without metal backing is integrated with the pass-band FSS, namely, a novel dual-band reflected PCM with a transmission window is realized. The -0.5dB-bandwidths of the two cross-polarized reflective bands are about 3.8 GHz (5.66~9.46GHz) and 2.0 GHz (16.9~18.9GHz), respectively. The -3-dB bandwidth of the transmission window is approximately 1.35 GHz (12.2~13.55 GHz). Lastly, the proposed structure prototype is fabricated and tested. The measured results are in good agreement with the simulated ones. In addition, the principle of operation and detailed design is also presented and discussed.