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A novel method to improve the omnidirectionality of the dielectric resonator antenna array

A wideband omnidirectional dielectric resonator antenna (DRA) has been proposed. The simulated results show that the reflection coefficient of the DRA is less than −10dB in the frequency band of 1.61GHz-2.92GHz (57.8%), which can cover the 2G/3G/LTE bands simultaneously. In order to improve the omnidirectionality of the DRA array, a novel method to arrange the feeding coaxial cable is proposed. Based on this method, a wideband DRA array with a good omnidirectionality is designed, which gain variation ranges from 0.65dB to 0.97dB over the operating band of 1.7GHz–2.7GHz. Besides, the maximum and minimum gain in the horizontal plane are 9.0dBi (at 2.31GHz) and 6.33dBi (at 1.7GHz), respectively. The proposed antenna in this paper can be a good alternative in wireless communication systems.