A tunable, band-pass, miniaturized-element frequency selective surface: Design and measurement

Frequency selective surface (FSS) structures, with resonant unit cells whose dimensions are comparable to half of a wavelength, have been studied for a variety of applications like radar and satellite communications. FSSs are usually 2D planar, periodic structures consisting of one or more metallic patterns, each backed by a dielectric substrate. The frequency response of an FSS is entirely described by the geometry of the structure in one period called a unit cell. In traditional FSS design, the frequency selective properties result from mutual interactions of the periodic FSS elements.