Bandwidth enhancement and generation of CP by using parasitic patch on rectangular DRA for wireless applications

Abstract

A wideband circularly polarized rectangular dielectric resonator antenna (DRA) fed by single feeding mechanism has been studied theoretically and experimentally. The study has been carried out to find out the effect on different antenna parameters when a parasitic strip is attached to the wall beside the conformal metallic feed. The DRA is excited by an E-shaped metal strip. The novel feed produces a narrow impedance matching |S11| ≤ −10 dB bandwidth of 7.94%. Further enhancement is carried out by introducing the parasitic patch at an optimal location on rectangular DRA, such configuration provided a measured circular polarization (CP) waves over a broad bandwidth of 22.01% (3.59 – 4.40 GHz) in conjunction with a wide impedance matching bandwidth of ∼23% (3.6 – 4.45 GHz). These results represent that; parasitic patch not only generate CP but also an increase by a factor of ∼ 3 times in return loss as compared to those achieved by E-shape feed only. Simulation is done through computer simulation technology (CST-2017). The prototype of the proposed antenna geometry is fabricated and measured. Performance parameters demonstrate that the proposed antenna is well suitable for WiMAX applications. The simulated results agree reasonably with measurements.