Cavity Backed Dual-Polarized Base Station Antenna for 5G Applications

In this article, a dual-polarized antenna is proposed, which can be used for the base station of sub-6 GHz 5G applications. The antenna consists of two crossed dipoles, each embedded with two leaf-shaped patches to achieve wider bandwidth and excited using a T-shaped feed structure backed with a metallic reflector. The two vias are used to separate the feed line to improve the isolation between the ports. The prototype is fabricated and tested. The measured reflection coefficient bandwidth for port-1 is 53% (2.44-4.2 GHz), for port-2 is 54.5% (2.4-4.2 GHz), and isolation between the ports is better than 17 dB. Design exhibits a stable broadside radiation pattern with polarization diversity and covers three 5G NR bands of sub-6 GHz, i.e. n38, n41 and n77.