基于RWG基函数的电场积分方程的奇异性处理

Dealing with the Singularity of EFIE Based on RWG Base-Function

采用矩量法分析导体三维散射体时,基于RWG基函数的电场积分方程存在奇异性,如果直接使用数值积分,则准确性很低。为了得到准确的积分结果,将被积函数拆分为2部分,对于无奇异点的部分直接使用数值积分求解,而对于包含奇异点的部分通过积分变换简化被积函数,得到解析表达式,计算实例验证了这种方法的正确性。

When analyzing a conducting scattering body with method of moment,the integral term of electric field integral equation （EFIE） based on RWG base-function gets singular characteristic. The resuit gets low accuracy by using numerical method. In order to get accurate result, separate the into two parts. For the part without singularity point use numerical change of variables in integrals which included singularity point, method to get result. As a analytics result is obtained. integral result of Sample computations are given to validate this method.