Multiobjective Optimization Design of Broadband Dual-Polarized Base Station Antenna.

A compact broadband dual-polarized antenna is proposed for 3G/4G/5G base station applications. The main radiator is composed of two crossed dipoles contoured by cubic Hermite spline interpolation method to obtain compact size. In order to shorten design period, a multiobjective optimization technique is adopted through synthesizing multiple performance characteristics simultaneously and thus avoiding extensive structural parameter analysis. For antenna designers, this paper provides a novel design method for broadband dual-polarized base station antennas with stable radiation patterns and small gain variations from the perspective of optimization. The proposed dual-polarized antenna achieves a bandwidth of 66.4% (1.83–3.65 GHz). The measured port isolation is higher than 28 dB. Within the working band, the realized gain is more than 8.1 dBi, and gain variations are smaller than 0.5 dB. The half-power beamwidth (HPBW) is within 65˚ ± 3˚. The cross polarization discrimination (XPD) level is better than 20 dB at boresight and better than 13 dB within a sector of ±60˚.