HIGH GAIN DIELECTRIC RESONATOR ANTENNA WITH SOFT CAVITY AND SOFT SURFACE FOR MILLIMETER-WAVE APPLICATIONS

In this paper, a 60 GHz high-gain dielectric resonator antenna (DRA), integrated with soft surface and capacitive soft cavity is presented. The soft surface consists of a perforated dielectric cylinder, shorting vias, and three concentric layers of metallic strips printed on both sides of the dielectric cylinder. The capacitive soft cavity comprises ten concentric planar strips printed on top of a dielectric substrate. The soft surface blocks surface wave propagation by introducing a gap waveguide, while the soft cavity focuses the beam in the main direction yielding more directive power pattern. When incorporating the soft cavity and the capacitive soft surface with the aperture-coupled DRA, simulation results show a gain increase of up to 3 dB, frontto-back ratio enhancement of 7 dB, and less radiation toward the substrate edges.