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A water-based switchable frequency selective rasorber with polarizationselectivity using the Great Wall structures is presented in this paper. Theproposed structure comprises a container containing horizontal and verticalchannels enabling dividable injection of water, and a cross-gap FSS. Thenovelty of the design lies in its switchability among four different operatingstates by injecting water or not into the water channels. When the container isempty, the structure acts as a polarization-intensive FSS with a -0.42 dBinsertion loss passband at 3.75 GHz. When the horizontal channel is filled withwater and there is no water in the vertical channel, this structure can be usedas an FSR with single polarization selectivity. The FSR with -10 dB absorptionband from 6.8 GHz to 18.8 GHz only allows certain polarized electromagnetic(EM) waves to pass at 3.1 GHz with an insertion loss of -0.78 dB, while anotherpolarized EM wave cannot pass. When the container is full of water, thestructure operates as an absorber with a reflection band below the absorptionband, where neither of polarization EM waves can transmit. Besides, areconfigurable water-based FSR automatic control system is built to achievestate switching and temperature constancy of the water within the container.Ultimately, a prototype of the presented design is fabricated, simulated andmeasured to verify the feasibility. This work has potential application inradome design to realize the out-of-band RCS reduction.

Great Wall-like Water-based Switchable Frequency Selective Rasorber with Polarization Selectivity