Design of metal broadband dual polarization antenna for 5G base stations

This article proposes a metal die-casting broadband dual polarization antenna for base stations, which has the advantages of high gain and strong reliability compared to PCB board antennas. The antenna configuration includes a vertical±45 dipole metal element and is equipped with a circular phase-shifting plate to control its standing wave. It adopts (Г)feeding, which is beneficial for the bandwidth of the antenna. The standing wave in the frequency range of 1.6-3.2GHz can be reduced to less than 1.5, and the antenna size is 0.3λ* 0.3λ* 0.25*λ, where λ is the wavelength corresponding to the antenna's operating frequency range of 1.7GHz. The simulation results show that the antenna achieves VSWR<1.3 in the operating frequency band (1.7-2.7GHz), with an isolation between the two ports of less than -25dB, and an antenna gain of 9±0.5dBi. Having a stable directional pattern, the cross polarization ratio between -60°and+60° is greater than 25 in the 10 axis direction. Therefore, it has good application prospects in the field of base station applications