A novel wide dual band circularly polarized dielectric resonator antenna for milli meter wave 5G applications

Abstract

A novel singly fed Dielectric Resonator Antenna (DRA) is proposed here for milli meter wave 5G (Fifth Generation) frequency band applications. The DRA has achieved wide dual bandwidth with circular polarization at the defined 5G frequency bands. The resonances of this dual band antenna occur at 22.06 GHz, 24.5 GHz and 29.84 GHz. The percentage bandwidth |S11| < -10 dB of 26.3% is achieved at the first band (19.52–26.36 GHz) and 7.69% at the second band |S11| < -10 dB (28.26–30.26 GHz). Both the achieved bands here are covered under the Band 30 GHz category of 5G frequency spectrum. Compared to the conventional rectangular DRA, a novel trapezoidal shaped DRA is designed here which is fed by a microstrip line with characteristics impedance of 50 Ohm. The defined electrical dimensions of the DRA are 0.25?0 × 0.29?0 × 0.22?0 considering 26 GHz as its resonating frequency. The DRA is placed over a Rogers substrate with dimensions 0.5?0 × 0.5?0 × 0.1?0 and permittivity of 2.2. The DRA is circularly polarized and has a 3-dB axial ratio bandwidth of 5.23%. The DRA has achieved a gain value of 3.28 dB. Milli meter wave communications require wideband antennas with circular polarization features to support high throughput communication channels. This singly fed DRA has achieved wide dual bandwidth with circular polarization and is more suitable for indoor 5G small cell applications.