A novel three feeds circularly polarized microstrip antenna was proposed in this paper. The antenna feeding network was realized using a one-three power divider to enhance the rotational symmetry of circularly polarized radiation of the microstrip patch antenna. The proposed antenna element was arranged into a 3×4 array using sequentially rotated technique to effectively improve the array gain scanning performance. The array radiation and polarization performance during beam scanning was investigated as well. The simulation results indicate that the array beam can be steered in the elevation up to 60° at the center of the operating frequency. The gain of no less than 11.9 dBi and the axis ratio (AR) of no more than 2 dB are obtained within the scanning angles.%提出了一种三馈电圆极化微带天线.天线馈电网络采用一分三功分馈电,实现微带贴片天线的圆极化辐射,增加方向图的旋转对称性.用该天线作为阵列单元,采用顺序旋转布阵技术组成一个3×4阵列,有效地改善了阵列天线的增益扫描特性.研究了该阵列天线波束扫描时的辐射特性和极化特性.仿真结果表明:阵列天线在中心工作频率处能实现俯仰60°的扫描,在扫描范围内增益大于11.9 dBi,轴比小于2 dB.
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