A metasurface with three different configurations for absorption, transmission or reflection of incident electromagnetic waves

Abstract This paper presents a metasurface with three different useable configurations. The full metasurface consists of a PTFE enclosure having 12 compartments sandwiched between two layers of 2D periodic metallic patterned FR-4 substrates. The PTFE compartments can be kept empty or filled with deionized (DI) water. The first configuration is achieved when all the compartments are kept empty, the second configuration is achieved when alternate compartments are filled with DI water, and the third configuration has all the compartments filled with DI water. In the first configuration, the metasurface acts as a normal electromagnetic (EM) wave reflector, in the second configuration it acts as a dual-band spatial passband filter which allows EM waves within certain frequency bands to pass through and in the third configuration, it acts as a multiband EM wave absorber. The metasurface can operate within the S and C microwave bands. The thickness of the entire structure is only 13.04 mm, which corresponds to around λ 0 /3.7 ( λ 0 is the free space wavelength at the highest operating band). The transmission and absorption bands have good angular stabilities up to an incident angle of 60°.