4单元矩形径向线螺旋阵列天线的理论分析和数值模拟

Theoretical analysis and numerical simulation of 4-element rectangular helical array antenna fed from radial waveguide

提出了一种便于组合的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L型电磁组合探针的耦合特性，设计并数值模拟了中心频率为4．0GHz的4单元矩形径向线螺旋阵列天线。模拟结果表明：该天线易于实现单元天线激励幅度和相位的均匀性及其随频率变化的平坦性。该口径为90mm×90mm的天线在中心频率4．0GHz下，方向性系数为12．57dB，轴向轴比值1．55；在3．60～4．05GHz的频率范围内方向性系数大于11．6dB，轴比小于1．55，反射系数小于0．2。

A helical rectangular array antenna of 4-element using L-shaped coupled probes is put forward, which is helical rectangular array antenna fed from radial waveguide and can be used to realized the directional rediation of microwave. Theoretical analysis and numerical simulation show that the antenna is subject to the exiting uniform of each elements and the consistency versus frequencies. The directivity is 12.57 dB and the axial ratio at the normal direction is 1.55 at 4.0 GHz. In the range of 3.60 GHz to 4.05 GHz, the directivity is upon 11.6 dB, the axial ratio is below 1.55, and the reflecting coeffieclent is 0.2.