Electronically switchable metasurface for absorption and reflection modes

In this paper, we present a novel electronically switchable metasurface that provides absorption and reflection modes depending on bias voltages of pin diodes. The metasurface is designed by a periodic split ring resonator loading the pin diode. When the pin diodes turn on, the metasurface is working as the absorber. When the pin diodes turn off, the metasurface is working as the reflector. For a reliable operation, bias networks are designed as well. The performance of the proposed metasurface is demonstrated from both full-wave simulation and measurement. At 10.97 GHz, the metasurface shows 99.4% absorptivity and 100% reflectivity at the absorptivity and reflection modes, respectively.