A Wideband 8-Element Dual-Circularly-Polarization Dielectric Rod Antenna for 5G Millimeter-Wave Communications

This article presents an 8-element dual-circularly-polarization dielectric rod array antenna based on 5G millimeter-wave band. Each antenna element consists of a metal waveguide embedded stepped diaphragm and dielectric rod antenna, which is fed by dual port feed. The operational frequency range of each antenna is from 24.25 GHz to 27.5 GHz. In addition, the dielectric filled into the polarizer is adopted to meet the needs of component miniaturization, and the impedance matching between the antenna and the air is improved by extending the dielectric rod antenna, which achieves better input impedance bandwidth and isolation better than 20 dB over the operating band. The simulation results indicate that the antenna element exhibits a return loss with |S11|<-22 dB over the operating band, the axial ratio remains below 0.7 dB, and the realized gain is greater than 6.92 dB. Additionally, the 8-element array exhibits robust beam-scanning capabilities with a maximum beam-scanning angle of 51°. Finally, the peak gain of the antenna array is 15.3dBi.