A 3D-Printed Hybrid Dielectric Resonator Antenna with Low Cross-Polarization

A 3D-printed dielectric resonator antenna (DRA) working from 4.75 to 5.25 GHz with low cross-polarization is presented. The polarization purity is significantly enhanced by using an optimized T-shaped feeding structure, when compared to the utilization of a conventional probe-fed excitation. The T-shaped feeding structure can reduce the cross-polarization level up to 8.2 dB at lower frequencies, which makes the highest cross-polarized components around -15 dB over the whole operation bandwidth. A grounded metal strip is introduced to compensate the increase in working frequency due to the T-shaped feed. The agreement between simulation and measurement results validates the effectiveness of the proposed approach in polarization purity improvement.