A broadband dielectric resonator (DR) antenna is designed by merging its three resonant bands. An asymmetrical moat carved off the DR is designed to perturb the electric field distribution within the DR so that theQfactor of the DR is reduced, and the radiation pattern on theE-plane can be modified to increase the gain in the broadside direction. The mode mixing effect on the radiation patterns is also studied. A wide impedance bandwidth of 33%(4.89-6.86 GHz) is obtained with broadside radiation pattern of vertical polarization on the horizontal plane. This DR antenna can be used for WLAN 802.11a (5.15-5.85 GHz) applications.
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Chang et al. (2009) studied this question.
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