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介绍了平面分层媒质中适用于C类混合位积分方程(MPIE)的格林函数的精确计算方法。重点讨论了空域格林函数求解过程中的表面波精确提取问题。精确定位极点之后,采用围线积分法准确计算各极点处留数值。在提取表面波后,采用二级离散复镜像(DCIM)方法求解了一个两层结构的空域格林函数,并与文献值进行了对比,结果吻合良好。文章最后结合空域矩量法(MoM)求解了微带结构的散射参数,并与商业软件CST仿真值进行了对比,结果吻合良好。
The exact calculation method of Green’s function for class C mixed-bit integral equation (MPIE) in planar layered media is introduced. This paper focuses on the precise extraction of surface wave in the process of solving Green’s function of airspace. After pinpointing the pole precisely, the method of the circumference integral is used to accurately calculate the value of each pole. After the surface wave was extracted, a two-layer spatial Greenland function was solved by the second-order discrete complex image (DCIM) method and compared with the literature values. The results are in good agreement. Finally, the scattering parameters of the microstrip structure are solved by MoM, and compared with the commercial software CST simulation results. The results are in good agreement.