A Reconfigurable Broadband Polarization Converter Based on an Active Metasurface

We propose an active metasurface whose functionalities can be dynamically switched among linear-to-linear, linearto-elliptical, and linear-to-circular polarization conversions in a wideband. The active metasurface is composed of butterflyshaped unit cells embedded with voltage-controlled varactor diodes. By controlling the bias voltage of the varactor diodes, the electromagnetic responses of the p...