Wideband Dielectric Resonator Antenna With Dual Circular Polarization

In this communication, two wideband dual-polarized dielectric resonator antennas (DRAs) for X-hand radar applications are presented. The design procedure is started with designing a linear polarized DRA fed by a microstrip line. The feedline is optimized to excite the hybrid electromagnetic (HEM)us modes of DRA which corresponds to magnetic monopole-like radiation. Then, a novel quadrature hybrid is designed in the feeding structure to provide both left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). two antenna prototypes are fabricated and tested: a dual (right hand and left hand) circular polarization DRA with omnidirectional pattern and an enhanced gain version of dual-polarized circular polarized (CP) DRA with a directive pattern. The measurement results of antennas confirm wideband impedance bandwidth (34% and 38.897) as well as wideband axial ratio (AR) ones (23% and 30%) in element and array structures, respectively. The antennas also provide both RHCP and LHCP radiation. The first antenna contains monopole-like radiation which is aimed at wireless systems with omnidirectional pattern requirements. The second antenna, a 2 x 1 antenna array, presents around 9 dB across the entire band. The presented antennas are good candidates for radar applications such as weather monitoring, air traffic control, and vehicle speed detection.

Automated summary

This paper presents two wideband dual-polarized dielectric resonator antennas for X-band radar applications and provides the design process and measurement results. The antennas demonstrate wideband impedance bandwidth and axial ratio, and offer both RHCP and LHCP radiation. They are suitable for various radar applications.