A Wideband Multifunctional Multilayer Switchable Linear Polarization Metasurface

In this letter, a wideband multifunctional and switchable linear polarizer has been presented based on an active metasurface for the X-band. The proposed structure consists of three metallic layers and two dielectric spacers. The switchable function is obtained by embedding PIN diodes, which are controlled by four independent sets of external dc bias networks on the top and bottom metallic layers. Two main functions (polarization conversion and polarization separator) and four working states are exhibited by combining four independent sources. As a polarization rotator, the proposed structure converts electromagnetic (EM) waves to cross-polarization from 5.2 to 16.7 GHz with the polarization conversion ratio beyond 90%, while as a polarization separator, the copolarization EM waves can be transmitted and the cross-polarization waves reflected with isolation over 10 dB from 8 to 14.3 GHz. The numerical and experimental results are in a good agreement, which demonstrates the excellent and stable performance of the proposed structure.