The DRA is an open resonating structure, fabricated from a low loss microwave dielectric material. Dielectric resonators (DR’s) have proved themselves to be ideal candidates for antenna applications by virtue of their high radiation efficiency, flexible feed arrangement, simple geometry, small size and the ability to produce different radiation pattern using different modes.
Additionally, DRA’s avoid some limitations of the patch antenna including the high conductor losses at millimeter-wave frequencies, sensitivity to tolerances, and narrow bandwidth. DRA’s of cylindrical, hemispherical and rectangular shapes are most widely used and investigated.
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