Design and modeling of an absorptive frequency selective surface with several transmissive bands

An absorptive frequency selective surface (AFSS) which allows signals transmitted in some specific bands is proposed. The transmitting characteristic is rare among AFSS design in the past and can be used to shield the whole package of mixed signal systems. The proposed AFSS provides above 97% absorption at 5.6 GHz in the Wi-Fi band and allows at least half power transmission below 1.84 GHz and above 8.95 GHz, which covers GPS band, most of GSM bands and X-band. Additionally, the proposed work is polarization independent and stable for oblique incident waves up to 45 degrees for both TE and TM polarizations. It is worth to note that clear design concepts and closed-form formulae based on a simple equivalent circuit model are provided, as well as useful design procedures.