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In this paper, a three-metal-layer-based compact dual-band frequency selective surface (FSS) is presented with enhanced angular stability and low insertion loss (IL). For the dual-band FSS structure design, the metal square ring in the middle layer facilitates coupling between the top and bottom metal structures. The designed FSS can generate four transmission zeros (TZs) positioned on both sides of each passband. The operating frequencies of the dual-band FSS are at 5.13 and 10.06 GHz, whose fractional bandwidths are 24.2% and 10.9%, respectively. The proposed dual-band FSS maintains insensitive performance on the incident polarization and angle.
Xu et al. (Mon,) studied this question.