Frequency Selective Surface with Wideband Switchable Absorption/Transmission Properties

An absorption/transmission-type wideband reconfigurable frequency selective surface (FSS), which can switch from wideband absorption to transmission performance, is proposed in this paper. The high dielectric loss and dispersive property of water are utilized to construct a wideband absorber without a metallic base plate. Then, a second-order bandpass FSS is added at the bottom of the absorber to introduce wideband transmission responses when water is repelled. By controlling the injection/expulsion state of water, the proposed structure can switch from the wideband absorption state (10.24-28.8 GHz) to the wideband transmission state (14.45-16.55 GHz) under normal incidence. Furthermore, the design exhibits excellent angular stability and maintains high performance for both TE and TM modes at incidence angles up to 45°.