Dielectric Resonators (DRs) are widely used in shielded microwave circuits such as filters and oscillators. In recent years, they have been studied extensively as antennas [1-5], as they could offer a number of advantages over other types of antennas including small size, large bandwidth, simple coupling structure and high radiation efficiency. Dielectric resonators have been studied in the literature in hemispherical, cylindrical, cylindrical ring and rectangular geometry. Compared with other geometry’s, rectangular resonators have some advantages in fabrication process, and electrically they have two independent aspect ratios, which could be chosen to provide the required radiation patterns, gain, resonance frequency, input impedance and bandwidth.

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