A Switchable Reflection-Type Linear/Circular Polarizers Based on Active Metasurface

In this paper a switchable reflection-type linear/circular polarizer has been proposed which can covert the linear incident wave to the cross-polarization or circular polarization. As a linear polarizer, More than 90% cross-polarization conversion efficiency is observed over the frequency range of 10.6-20.6 GHz. As a circular polarizer, the two orthogonal linear polarizations are equal in magnitude and, at same time, the phase shift is 90°. The bandwidth of the axial ratio less 3 dB is from 10 to 21.4 GHz.