A Multifunctional Broadband Linear-Circular Polarization Conversion Transmission Metasurface

In this paper, a multifunctional broadband linearly to circularly polarization (LP-CP) conversion transmission metasurface (MS) is proposed and investigated. With the Receiver-Transmitter (Rx-Tx) structure, the received and transmitted electromagnetic waves are manipulated independently by this MS. As a polarization selector for linearly incident waves, the proposed MS can receive y-polarized waves while reflecting cross-polarized waves. While implementing the LP-CP conversion, the proposed MS can also act as a phase shifter, modulating the phase of the transmitted CP wave. At the same time, the designed MS achieves good out-of-band rejection while enhancing bandwidth, which allows it to be considered a spatial filter. This broadband transmission MS, with its multiple functions of polarization selector, polarization converter, phase shifter and filter, shows great potential for a more convenient manipulation of electromagnetic waves.