Design of a novel 2.5-dimensional wideband frequency selective surface with stable perfomance for fifth generation communications

This paper presents a novel 2.5-dimensional (2.5-D) wideband frequency selective surface (FSS) which is designed for Fifth Generation (5G) communication applications. The structure design employs the vertical vias in the two-dimensional (2-D) periodic array of gridded square loops (GSL) to make the structure miniaturized and stable. By cascading two layers of such 2.5-D periodic arrays, the proposed FSS is able to obtain a broad passband as well as the wide out-of-band rejection. To prove the validity of this design, a corresponding equivalent circuit model (ECM) is further developed for better analysis. Both full-wave simulations and ECM results are in good agreement and demonstrate that the proposed FSS is a good candidate for 5G communication applications.