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A wideband low-profile chamfered rectangular dielectric resonator antenna (RDRA) with high gain is proposed for sub-6 GHz 5G new radio band applications. RDRA is excited with microstrip cross-slot aperture coupling which is employed on the substrate. The dielectric resonator antenna with low-profile produces unwanted back radiation. The reflector placed at the bottom side of the RDRA is accountable for gain improvement on boresight direction by reducing back radiation. Slits, introduced on the copper layer, help to control the phase difference between direct waves and reflected waves.A rectangular stub is added to microstrip feed to enhance the impedance matching between excitation port and the antenna. The proposed antenna offers 2.74-4.35 GHz impedance bandwidth and 9.1 dBi peak gain. The proposed design is fabricated and experimentally verified.

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This paper presents a brief review on the Rectangular Dielectric Resonator Antennas (RDRAs) for Sub-6 GHz band of frequencies. Various resonant modes, feeding mechanisms, bandwidth and gain enhancement techniques and size reduction methods have been discussed. Comparisons and advantages of dielectric resonator antenna over microstrip patch antenna have also been presented.