Metasurfaces with Interleaved Conductors: Phenomenology and Applications to Frequency Selective and High Impedance Surfaces

A class of metasurfaces and high impedance surfaces (HISs) formed by doubly periodic arrays of interleaved conductors with subwavelength unit cells is proposed and discussed by way of example of the spiraled Brigid's cross arrangements. The main mechanisms underlying the distinctive features of these surfaces such as a broad fractional bandwidth (FBW), high angular and polarization stability, and low loss are revealed and elucidated. It is demonstrated that all these salient characteristics of the interleaved arrays and HISs are attainable simultaneously being controlled by the pattern geometry. It is shown that the interleaved Brigid's cross HIS with truly subwavelength unit cells exhibits practically the same FBW and losses as a square patch HIS with much larger unit cell. The effects of a dielectric substrate and near-field confinement on the properties of intertwined Brigid's cross arrays are examined, and the analytical models provide insight into the performance of the discussed metasurfaces and HISs.