A Frequency Selective Rasorber with Two Absorption Bands

In this paper, a frequency selective rasorber (FSR) with two absorption bands is proposed. The proposed FSR is a double-layer structure, which is composed of a resistive sheet and a bandpass frequency selective surface. By cascading a resistive sheet with a parallel LC resonator to a bandpass FSS (which has a passband coincides with that of resistive sheet), a transmission window in the two absorption bands can be achieved. The designed FSR also shows a dual-polarized character under normal incidence.