Impact of Microstrip-Line Defected Ground Plane on Aperture-Coupled Asymmetric DRA for Ultra-Wideband Applications

Numerous elements of compact dielectric resonator antenna (DRA) for wideband shifting applications are proposed with microstrip-line-fed antenna on a defected ground plane. One to five cylindrical dielectric resonators that are asymmetrically located with respect to the center of rectangular coupling aperture are fed through the aperture of a defected ground plane. By optimizing the design parameters, a design has been achieved with an impedance bandwidth of about 121.2%, covering the frequency range of 2.92–12.GHz, and a simulated gain of 10dBi. Details of simulation and design of the proposed antennas and results are presented and discussed. The large slot technique combined with the technique of defected ground structure is used to enhance the impedance bandwidth of the patch antennas and the circuit performance.