Anisotropic Transmission Frequency Selective Rasorber

This paper proposes a frequency selective rasorber (FSR) with anisotropic transmission band. The FSR composed of a two-layered metallic structure with an air gap in the middle is implemented. At the top layer, split circle resonator (SCR) combined with metallic strip loaded with resistors is adopted to realize resistive sheet. At the bottom layer, a slot-type FSS with two kinds of slots is designed to match the passband of the resistive sheet. Full-wave simulation and measurement results show that the anisotropic transmission band with low insertion loss under different polarization is realized.