Design principles for coupled complementary metasurfaces

This paper investigates the properties of frequency selective metasurfaces (MTSs) made of a layer of conducting elements and a layer of the complementary (aperture) geometry, etched on either side of a dielectric substrate. The elements needed to synthesize such structures are small in terms of the wavelengths comprised within the operating bandwidth. Thus, one obtains improved frequency bandwidth stability and angular response. An interpretation in terms of the MTS's equivalent circuit is provided, along with design guidelines for the proposed structure.