16单元矩形径向线螺旋阵列天线的理论分析和数值模拟

 提出了一种16单元矩形径向线螺旋阵列天线。介绍了该矩形阵列天线的提出背景以及工作原理，分析了两种电磁组合探针的耦合特性，设计并数值模拟了中心频率为4.0 GHz的16单元矩形径向线螺旋阵列天线。模拟结果表明：该口径为180 mm×180 mm 的天线在中心频率4.0 GHz 下，增益为18.24 dB，轴向轴比值1.065；在3.8～4.2 GHz的频率范围内增益大于17.89 dB，轴向轴比值小于1.2，反射系数小于0.15，口径效率大于85％。

Theoretical analysis and numerical simulation of 16-element radial line helical rectangular array antenna

Radial line helical rectangular array antenna is a new antenna which realizes the directional radiation of circularly polarized microwave, and can be easily assembled to a high gain antenna. In this paper, the fundamental theory is introduced, and a helical rectangular array antenna of 16-element using two kinds of coupling probes is put forward. The numerical simulation result shows that at 4.0 GHz, the gain of the antenna is 18.24 dB and the axial ratio at the normal direction is 1.065. In the range of 3.8 GHz to 4.2 GHz, the gain is greater than 17.89 dB, the axial ratio is below 1.2, the voltage standing wave ratio is below 1.3, and the aperture efficiency is over 85%.