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A Compact Wideband Circularly Polarized Hybrid Dielectric Resonator Antenna

A compact wideband circularly polarized (CP) hybrid dielectric resonator antenna (DRA) is presented in this paper. The hybrid antenna combines three CP modes respectively produced by the DRA and the distributed patch. By digging a groove on the top of the DRA, the high-order modes (TE131&TE311) of the DRA can be shifted down to approach the fundamental modes (TE111x&TE111y). A 2×2 distributed patch is then placed inside the DRA to produce another pair of degenerate modes without increasing the overall size of the antenna. The three CP modes can be excited by a microstrip-coupled cross-slot and merged together, yielding wide impedance and AR bandwidths of 39% (2.9~4.3GHz) and 33% (3~4.2GHz) respectively, which can cover the 5G n77 band. The antenna has a compact size of 0.38 × 0.38 × 0.18 λ03(at the center frequency of 3.6 GHz). The antenna gain varies between 6 and 9 dBi across the passband.