Graphene-based Flexible Absorptive Frequency Selective Surface

A flexible absorptive frequency selective surface (AFSS) which has wide-band absorbing characteristics in the low frequency band and good wave-transmission characteristics in the high frequency is presented in this paper. The proposed AFSS consists of the resistive sheet, the bandpass FSS, and the supporting substrates. The resistive sheet is realized by putting 100 Ohm/sq rectangle graphene above on quasi-Jerusalem-cross metallic resonator. To realize flattop bandpass response, the multilayer frequency selective surface is used in bandpass FSS. The property of flexibility is obtained from the flexible substrates and graphene. The simulation results show that the proposed AFSS has good absorption performance from 6.5 GHz to 18.8 GHz, with 97.2% fractional bandwidth, and the insertion loss of the transmission band is less than 3 dB in the range of 21.3 GHz to 23.3 GHz. Furthermore, the proposed AFSS has a polarization-independent property and still has stable performance at large angles of incidence.