Wideband Circularly Polarized Dielectric Resonator Antenna Array with Polarization Diversity

Abstract

In this paper, a design approach for aperture coupled modified cylindrical dielectric resonator antenna (cDRA) array is discussed. The proposed radiating element is dual cylindrical ceramic blocks placed with a small gap. The proposed aperture excites dual radiating mode pattern inside modified cDRA, i.e., \text {HEM}-{11 \delta } and \text {TE}-{01 \delta }. The arrangement of radiating elements, i.e., dual cylindrical ceramic blocks, provides lower {Q} -factor (wider impedance bandwidth). Conversion from a single radiating element to an array arrangement provides the gain enhancement of 3.0 dBi in the complete operating frequency range. The proposed aperture offers circularly rotating EM wave within frequency range 4.5-5.7 GHz. Antenna prototype is fabricated for the validation of simulated near as well as far-field parameters. Practically measured outcomes confirm that it is working in between the frequency range 4.7-6.4 GHz. The 3-dB axial ratio bandwidth of the proposed radiator is about 23.52% (4.5-5.7 GHz). Directional radiation pattern and circular polarization features make the proposed radiating structure more appropriate for WLAN (5.2 GHz) and local thermal equilibrium (LTE) band 46 (5.5 GHz) applications.