Ultra-wide-band Circularly Polarized Mushroom-shaped Dielectric Resonator Antenna for 5G and sub-6 GHz Applications

In this paper, a mushroom shaped ultrawideband circularly polarized Dielectric Resonator Antenna (DRA) is proposed for lower 5G band and sub-6 GHz applications. The proposed DRA is excited by two orthogonal conformal probes and fed by a simple L shape microstrip feed network. The DRA exhibits wide impedance bandwidth of approximately 34.5% (3.5-5.1 GHz) with S11 better than -10 dB and wide circular polarization bandwidth of 33% (3.55-5 GHz) with axial ratio less than 3 dB in broadside direction. Mushroom-shaped DRA has a peak gain of 6.5 dBi and an average gain throughout the operating band is 5.5 dBi. Simulated results of the DRA are in good agreement with measured results of fabricated prototype. This DRA is a strong candidate for the sub-6 GHz and 5G band applications.