本文对介质薄层上折线周期结构的电磁特性作了研究,考虑了介质薄层中高次模对折线电流的影响,给出了金属一介质层等效电纳的解析表达式。在建立积分方程时,运用平面高斯定理改善了级数的收敛性。通过适当选取全域基函数,使电流积分方程的求解速度较用脉冲基函数求解也有了很大的提高。 In this paper, the electromagnetism of the periodic line structure of the dielectric thin film is studied. The effect of the high order mode on the broken line current in the dielectric thin layer is considered. The analytical expression of the equivalent dielectric susceptance of the metal-dielectric layer is given. When establishing the integral equation, the convergence of the series is improved by the Gauss theorem. By properly choosing the global basis function, the solving speed of the current integral equation is greatly improved than that of using the pulse basis function.