Wideband Miniaturized Polarization-Dependent HIS Incorporating Metamaterials

The use of metamaterial as a substrate for a high-impedance surface (HIS), which can miniaturize the size and significantly enhance the axial ratio bandwidth of a polarization dependent HIS, is introduced. The electromagnetically small Ω-type inclusions have been used to achieve the effective permeability and permittivity greater than that of the host dielectric. It is demonstrated that the proposed high-impedance surface can provide performance superior to the polarization-dependent electromagnetic band-gap (PDEBG) surfaces. This complex artificial ground plane is designed utilizing two reversed Ω patterns back to back on each side of a substrate board to avoid chiral effects.