Planar metamaterials and applications in directive antennas

In this paper, we reviewed some recent studies on planar metamaterials and demonstrated two new way to realize high directive antenna for the first time: 1) Quasi-periodic metamaterial surface can suppress transverse-electric (TE) surface waves and support directive emissions. 2) Periodic metamaterial surface can be applied in realizing one-dimensional subwavelength Fabry-Perrot (FP) metamaterial cavity which support directive emissions. We show both experimentally and theoretically that these phenomena mainly originate from the dispersive reflection phase and surface wave dispersions.