Bandwidth and Beamwidth Enhancement of a Singly-Fed Circularly Polarized Rectangular Dielectric Resonator Antenna using Parasitic Patch

Abstract

The circular polarization (CP) bandwidth and beamwidth of a rectangular dielectric resonator antenna (DRA) fed by an off-set conformal metal strip has been enhanced using parasitic patch. An increment of ~38% in the axial ratio (AR) bandwidth and ~37.5% in CP beamwidth has been achieved by placing the parasitic patch at optimized distance from the feeding strip on the DRA surface. A CP bandwidth of ~7.2% in conjunction with an impedance matching bandwidth of ~26.4 has been offered by the antenna. The proposed antenna offers a CP beamwidth of 112^o in the ϕ = 0^o plane and 80o in the ϕ = 90^o plane. The DRA has been designed, simulated and optimized using the computer simulation technology (CST). Finite Integration Technique (FIT) in CST has been used to compute the results while finite element method (FEM) has been used for validation of the results. A similar trend has been observed between two set of results.