Single-feed circularly polarized rectangular dielectric resonator antenna coupled with dual mode slot-line square ring resonator

Abstract

A novel single-feed circularly polarized (CP) rectangular dielectric resonator antenna (RDRA) based on dual mode slot-line square ring resonator (SSRR) is proposed. The dual mode SSRR loaded with a perturbation is used to excite the TE^x₁₁₁ mode and TE^y₁₁₁ mode of rectangular dielectric resonator (RDR) simultaneously. By selecting a suitable size of the perturbation, the orthogonal degenerate modes of the SSRR are obtained. Accordingly, the CP radiation pattern of the proposed RDRA is generated from the orthogonal degenerate modes of the SSRR. A prototype is designed and measured. The RDRA has a wide impedance bandwidth of 14.28% (3.16–3.66 GHz). The achieved 3 dB Axial Ratio (AR) bandwidth of the RDRA is about 100 MHz at 3.5 GHz. With the advantages of compact structure, CP performance and easy fabrication, this structure can be a good candidate for 5G communication system in the future.