In this paper a rectangular dielectric resonator antenna (RDRA) fed by Dielectric Image Line (DIL) through a narrow slot placed on a finite ground plane is numerically investigated using the Finite Element Method (FEM) using HFSS package. The whole structure of the antenna is exactly modeled in our simulation. Only the dominant mode is assumed propagating in the DIL and extends into the DRA through an aperture in DIL. The effects of ground plane size, thickness of ground plane and air gap between dielectric resonator and ground plane on the radiation performance of the antenna are investigated. For increasing DRA gain, four sidewalls are placed around the corners of the ground plane. Another PEC plane, as a reflector, is placed at the back of the structures for reducing the backward radiation. The results obtained for the antenna parameters include resonant frequency, radiation patterns, gain, transmission coefficient and return loss.

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