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A dual-layer, bandstop frequency selective sur- face (FSS) is presented in this paper for wideband applica- tions. Each layer uses patch type FSS with slots for minia- turization and are cascaded with an air gap in between. The low-profile FSS with unit cell dimension on the order of 0.2λ0 × 0.2λ0 provides transmission coefficient below -10 dB in the frequency range of 4-7 GHz with 56% bandwidth. The FSS exhibits a nearly linear phase varia- tion with frequency in the operating band and can be used as a substrate below planar wide band antennas with bi- directional radiation for enhancing its gain, directivity in the broadside direction as well as shielding it against nearby conductive surfaces such as metal cases, other printed antennas. Detailed design method, equivalent cir- cuit analysis and measurement results of the FSS are pre- sented in this paper.

A Dual Layer Frequency Selective Surface Reflector for Wideband Applications