A Dual-Band Frequency Selective Surface Design for Enhanced Spatial Filtering in C-Band

This paper presents the design of a cost-effective, dual-band frequency selective surface (FSS) operating in the C-band utilizing an FR4 substrate. The proposed FSS is engineered to achieve closely spaced frequency responses and is optimized for wide-angle incidence and polarization insensitivity, making it suitable for various practical applications. The designed FSS resonates at 6.9 GHz and 7.5 GHz with bandwidths of 300 MHz and 200 MHz, respectively, targeting a frequency range used in satellite communication systems.