A Multifunctional Polarization Converter Base on the Solid-State Plasma Metasurface

A novel multifunctional polarization converter (PC) based on the solid-state plasma (SSP) is proposed, which can switch two functions and adjust the working band. By energizing different parts of SSP resonators, the presented PC can accomplish three different operating states. In the state 1, this PC can operate in 6.12-9.50 GHz and the relative bandwidth (RB) is 43.3%, which can achieve the aim of the linear-to-circular polarization conversion (LCPC). In the state 2, the cross-polarization conversion (CPC) can be achieved in 4.62-8.34 GHz (the RB is 57.4%). Besides, in the state 3, such a PC can be implemented within a 7.92-10.34 GHz working band of CPC (the RB is 26.5%). All in all, the proposed PC can realize the function switchover between LCPC and CPC, and the operating bands of the CPC can be shifted flexibly between the states 2 and 3. The proposed PC has great potential values in antennas, imaging systems, electromagnetic devices and so on.