Double Step Junction Coupled Waveguide Fed Dielectric Resonator Antenna

A novel coupling enhancement technique of waveguide fed hemispherical dielectric resonator antenna (DRA) is presented in this paper. A capacitive waveguide junction using two steps is placed between the rectangular waveguide and the slotted ground plane, DRA is placed above the ground plane. Single, dual and wide band operation of the proposed technique is illustrated. Very good coupling is obtained with the double step junction coupled waveguide fed DRA. Broadside radiation patterns with very low levels of cross polarization are obtained.