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A wideband rectangular dielectric resonator (DR) with a horizontal tunnel is proposed. The bandwidth of the TEy111mode is increased by using the tunnel to reduce the Q-factor of the DR. As the tunnel height is increased, the electric field distribution of the TEy112mode is significantly modified such that its electric field distribution near the top surface of DR is similar to that of the TEy111mode, rendering a broadside radiation pattern. The band of the modified TEy112mode is merged with that of the TEy111mode to achieve a wide bandwidth of 20% (4.765.86 GHz) with broadside radiation pattern of vertical polarization on the xy-plane. The proposed DR antenna can be used in WLAN 802.11a applications.
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Chang et al. (2008) studied this question.
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