快速PO-MoM技术分析电大载体线天线宽带特性

PO-MoM混合方法是研究电大尺寸载体上天线特性的有效方法。在应用PO-MoM分析复杂载体上天线宽频带电磁辐射问题时,由于需要在间隔很小的多个频率点进行填充阻抗矩阵的运算,计算过程耗时多,效率低。本文采用阻抗插值技术,通过构造有理插值函数来快速计算PO-MoM中的阻抗矩阵,并在迭代求解方程过程中采用了一种近场预条件技术,节省了计算时间,提高了计算效率。采用上述快速技术计算了垂直安装于平板的单极子天线和星载螺旋天线的宽带特性,并探讨了阻抗矩阵插值技术实现过程中一些参数的选取的问题。数值结果表明,结合阻抗插值矩阵插值技术并使用预条件技术的PO-MoM可以快速有效地分析大型复杂载体上天线的宽频带特性。

Analyzing Wide-band Behavior of Wire Antennas on Large Platforms Combined with Fast PO-MoM Technique

The physical optics-moment of method(PO-MoM) is an efficient hybrid technique for EMC analysis of antennas on complex electrical-large platforms.In this paper,the impedance-matrix interpolation method is adopted in the traditional PO-MoM algorithm to accelerate the computation of the impedance matrix and the precondition technique is adopted to save the time consumed by equation solution.Some Parameters concerning about the impedance-matrix interpolation are also discussed.Numerical results show that the proposed fast PO-MoM technique is very efficient in saving CPU time compared to the conventional PO-MoM for the analysis of the wide-band behavior of the onboard antennas.