Bandwidth Enhancement of Circularly Polarized Cylindrical DRA using Parasitic Half Loop

Abstract

: Antennas exhibiting wide operational circularly polarized (CP) bandwidth capability has been the focus of the numerous research activity in the wireless communication technology. Dielectric resonator antenna (DRA) provides one of the most attractive candidates for such requirements. In this paper, a singlepoint fed cylindrical DRA with a parasitic half loop is proposed for further enhancement of the CP bandwidth. The DRA configuration that is excited by a driven open half loop conducting metal strip with a parasitic loop has been studied theoretically and experimentally. Utilizing such excitation has provided a measured CP and return loss bandwidths of ~8.12%, and 8.23% respectively. These results represent an additional CP bandwidth increment of ~85% compared to those achieved by the cylindrical DRA configuration excited by a driven half loop only. Additionally, a good agreement has been attained between the measured and computed results.