Frequency selective absorption using lumped element frequency selective surfaces

A three-layer frequency selective surface (FSS) filter is presented that over a narrow frequency band simultaneously attenuates the microwave signal transmitted through and reflected from the filter. This is achieved using a lumped element resistive FSS in between a conventional FSS and a lumped element capacitive FSS. The device is simulated and its functionality is experimentally confirmed using a waveguide setup. More than 30 dB attenuation is observed in both the reflected and transmitted power.