Dielectric-free multi-band frequency selective surface for antenna applications

In this paper, the design of a multi-band Frequency Selective Surface (FSSs) is proposed. The aim of the work is to design simple and high-performing screens capable to separate circularly polarized electromagnetic waves in Ku band from the ones in Ka band. The proposed screen consists of a regular array of circular holes in a metal thick plate, in order to grant the robustness to mechanical stress for antenna applications in extreme conditions. For all applications in which the FSS is asked to be as much simple as possible and the insertion-loss specifications are severe, the inductive double resonant element FSSs here proposed turn out to be an interesting alternative to typical capacitive double ring FSS screens.