A Novel Feeding Technique for Dielectric Resonator Antennas (DRAs) for Broader Bandwidth

This article reports on a novel Coplanar Wave-Guide (CPW) loop feed structure with an isolated circular slot in the middle to excite a higher order mode in the cylindrical Dielectric Resonator Antenna (DRA). The proposed feeding structure is etched on the bottom side of the substrate and it allows the cylindrical DRA to achieve a broader bandwidth and higher gain. For demonstration, the proposed feeding structure with the DRA is optimized at the X-band over the frequency range from 7.88 GHz to 8.78 GHz. The simulation results and experimental validation confirmed that the proposed feeding structure for the DRA can be used for achieving a broader bandwidth, higher gain, and broadside radiation characteristics.