基于RWG矩量法的短波天线辐射性能分析

Analysis of shortwave antenna radiation performance based on RWG-MoM

RWG矩量法在短波天线和地面全剖分时数据量过大且地面效应不足,针对由此引起的计算准确度偏低问题,提出一种新的计算模型。新模型引入辅助三角形对短波接地天线馈源模型进行改进,以理想导电半空间场型并矢格林函数作为电场积分方程的积分内核,RWG边元仅剖分天线辐射体。采用矩量法离散电场积分方程,分析阻抗矩阵计算中的奇异积分和高震荡性问题,引入9点积分法予以解决。以短波鞭状天线为例,进行场强方向图和输入阻抗的仿真,结果与商用电磁仿真软件FEKO以及公开的文献吻合较好。新模型可减小计算量和仿真时间,提高计算准确度。

There would be too much data and little ground effect to calculate the radiation filed correctly when shortwave antenna and ground are all meshed by RWG-MoM.Therefore a new calculation model is proposed in this paper.In this model,some auxiliary triangles are introduced to improve the feed source model,only the antenna radiator is meshed by RWG （RAO-Wilton-Glisson,RWG）edge elements,and the electric field’s dyadic Green’s function integral solution is obtained on perfectly electric conducting flat.The Method of Moment （MoM）is adapted to discrete the Electric Field Integral Equation （EFIE）. The singular integral and highly ringing in impedance matrix calculating are analysed and solved by Nine Points Integral Method.Using shortwave whip antenna as example,the field pattern and input imped-ance are simulated and calculated.Results are in good agreement with the ones calculated by commercial electromagnetic simulation software FEKO and published papers.This new model could reduce the quan-tity of data and formulated time and increase the calculation accuracy.