Gain and bandwidth improvement of an aperture coupled cylindrical dielectric resonator antenna using an EBG structure

In this paper, a new technique for the bandwidth and gain enhancement of dielectric resonator antennas using a cylindrical electromagnetic band gap (EBG) structure has been proposed and demonstrated numerically. An aperture coupling scheme has been used to enable the isolation of the microstrip feed and the antenna. The EBG structure is based on the mushroom-like structure with a circular symmetry. It is composed of a periodic structure of metallic rings and of a periodic structure of vias. The periods of these two structures have been optimized using a full wave method to maximize the antenna gain. Numerical results have been presented showing that a gain enhancement of 6 dB and an impedance bandwidth of 24% are achieved with the new substrate.