Dual-Band Aperture Shared Antenna Array With Decreased Radiation Pattern Distortion

In this communication, a dual-band aperture-shared antenna array (ASAA) is developed for base station. This ASAA contains a 4
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4 high-band (HB) antenna array, which operates from 3.4 to 3.8 GHz, and low-band (LB) antenna, which operates from 0.69 to 0.96 GHz. For decreasing pattern distortion of HB array due to the induced current in the LB element, a method following two side chokes (TSC) is proposed. By loading the TSC, the LB element exhibits a cross-band scattering suppression performance in HB. Furthermore, ASAA is fabricated and measured. Measured results show that the proposed ASAA exhibits stable radiation performance in both LB and HB. Also, the LB antenna can cover 0.69–0.96 GHz (VSWR < 1.5). Hence, the antenna array can be a good candidate for future 5G and 2G/3G/4G aperture-shared base station antenna array.