导体-介质组合体散射分析两种积分方程法比较

Comparison of two integral equation approaches for analysis of scattering by combined conducting and dielectric bodies

采用耦合积分方程和单积分方程两种方法,分析了三维导体-介质组合体目标的电磁散射问题。与传统的耦合积分方程法相比,单积分方程法使介质体表面的未知量数目减少一半,并且能获得更快的迭代解。讨论了导体-介质交界线上RWG基函数的正确处理问题。对介质锥-导体柱组合体、导体-介质组合球和某导弹模型的雷达截面(RCS)进行了计算和比较,验证了两种积分方程方法的正确性,且数值结果表明单积分方程法更加有效。

Coupled integral equation （CIE） and single integral equation （SIE） methods are employed to analyze the electromagnetic scattering by three-dimensional combined conducting and dielectric bodies. Compared with the conventional CIE approach, the S/E scheme reduces the number of unknowns by a factor of two for dielectric bodies and has faster convergence for an iterative solution. The correct handling of RWG basis functions on the connecting boundary of the composite conducting and dielectric bodies is discussed. The Radar Cross Section （RCS） of a combined dielectric cone and conducting cylinder, a composite sphere and a missile model are calculated and compared. Numerical results demonstrate that both of the two integral equation methods are valid and the SIE method is more efficient.