A Broadband High Gain Base Station Antenna

This paper suggests a base-station antenna unit designed for 2G/3G/LTE frequencies, featuring ±45° polarization, high gain, and low cross-polarization. The antenna is excited by two circular arc probes and uses two orthogonal rectangular ring dipoles to achieve a wider bandwidth. In order to achieve higher gain and better cross-polarization level, four parasitic elements are added around the dual dipole. The simulation results show that |S
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|<10 dB in 1.7-3.0 GHz(55.3%). Moreover, the antenna obtains better port isolation (>27 dB), higher gain (9.6±1.4 dBi), front-to-back ratio(>18 dB) and a beamwidth of 57.5±7.5° in the desired bandwidth range. The antenna can be used in the broadband base station of the communication system.