In this paper, the effect of position perturbations on the bandwidth of an aperture coupled dielectric resonator antenna (DRA), is presented. Two combinations of stacked DRA's are considered for the analysis: larger over smaller (LOS), and smaller over larger (SOL). Different position perturbations on transmission line (TL), LOS, and SOL are applied to widen the matching bandwidth of the antenna. The performance of the proposed antenna are compared with the conventional antenna designed with no perturbations. The proposed antenna not only provides 5:1 ultra-wide matching bandwidth (from 2.7 GHz to 13.6 GHz), but also result in a highest gain of 9 dBi, which is 2 dBi more than the antenna designed with conventional method with no perturbation.
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