时域天线阵列半功率波束宽度计算

Calculation on the Half Power Beam Width of Time Domain Antenna Array

对于冲击雷达系统中的时域天线阵列,提出点源近似模型,用来计算时域超宽带天线阵列辐射瞬态电磁脉冲的场方向图以及辐射波束的半功率波束宽度。采用点源近似模型计算的半功率波束宽度和CST仿真结果一致,并和实验测试结果吻合得很好。实验表明,阵列辐射瞬态电磁脉冲具有波束聚焦特性,点源近似模型可以作为一种简便的方法,对时域天线阵列的参数进行分析。

For time domain antenna array in impulse radar system, a point source approximation （PSA） model is introduced in this paper and used to achieve the radiated pulse field pattern and the half power beam width for the radiated transient electromagnetic pulse from ultra-wideband antenna array. PSA calculation results agree well with CST simulation results and experiment measurement data. It has indicated that the point source approximation model can be used as a simple method to analyze the parameters of time domain antenna array.