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A dielectric resonator (DR) antenna with a well is proposed, of which the beamwidth is increased to more than 120deg by bending the ground plane. This DR antenna has its 10 dB return-loss band in 3.4-3.8 GHz, thus can be used as a sectorial antenna in WiMAX (3.4-3.7 GHz) base station.
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Chang et al. (2009) studied this question.
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