A Broadband Dual-polarized Antenna for Sub-6 GHz Base Station Application

A broadband dual-polarized antenna for base station application is proposed in this paper. The proposed antenna is composed of the main radiator elements, feeding baluns, lower-substrate, and ground plane. Two pairs of quarter-circle dipoles are designed as the main radiator to achieve the dual-polarized characteristic. The devised dipole antenna is excited by the two integrated baluns with convex portions, which is fed by 50 Ω coaxial. Both the main radiator elements and lower-substrate placed on the ground plane are connected by convex portions to ensure structural stability and electrical connection. By simulating and optimizing in the CST, the results show that 22% (4.0-5.0 GHz) impedance bandwidth is achieved. Moreover, high isolation and stable radiation patterns are also obtained over the operating frequency band. With the advantages of concrete structure, high gain, and low cost, the broadband dual-polarized antenna is designed, which is suitable for Sub-6 GHz communication for the base station.