Design and experimental verification of three-dimensional fss elements with wide frequency responses

summary form only given. In designing frequency selective surfaces (FSS), one of the desirable design goals is to achieve a wide bandwidth, as well as a sharp transition from pass- to stop-band. There are several techniques used to control the FSS bandwidth, which include: (i) choosing suitable lattice spacing; (ii) using element shapes that provide a sharp frequency transition, e.g., screens with thick apertures; and (iii) cascading multiple layers of FSS screens and dielectrics.