An Ultrabroadband Reconfigurable Polarization Conversion Metasurface

In this work, a reflective reconfigurable polarization conversion metasurface (PCM) using PIN diodes is proposed. An L-shaped unit is adopted to achieve an ultrawide operating band. The PCM shows when PIN diodes are forward biased, the linear-to-linear (LTL) polarization conversion with the polarization conversion ratio (PCR) higher than 90% is in the range of 5.49-16.51 GHz (relative bandwidth of 100.27%); when the diodes are reverse biased, the linear-to-circular (LTC) polarization conversion with the axial ratio (AR) less than 3 dB are in the range of 3.2-4.4 GHz (relative bandwidth of 31.57%, RHCP) and 5.14-17.43 GHz (relative bandwidth of 108.9%, LHCP). The proposed PCM shows versatile functions which is expected to be applied to a broad scanning range array, intelligent reflecting surfaces (IRS), and remote sensing.