圆柱形多层介质耦合微带线的准静态特性分析

Analysis for the Quasistatic Characteristics of Cylindrical Coupled Microstrip Lines Filled with Multilayered Dielectrics

本文提出一种计算圆柱形多层介质耦合微带线准静态特性的新方法——采用傅里叶级数作为插值函数的有限元方法。它涉及的矩阵方程阶数低、计算量小和精度高。与保角变换法相比，其突出优点是简单和适用面广；与积分方程法和谱域法相比，它的物理意义明确且不存在基函数选择和相对收敛性问题。给出实例计算结果并与文献值作了比较。

A novel approach, the finite element method (FEM) using Fourier series as the interpolating function, is presented in this paper for calculating the quasistatic characteristics of cylindrical coupled microstrip transmission lines filled with multilayered dielectrics. It is very similar to the normal FEM, but has much lowerorder matrix equation, smaller computational contents and higher accuracy. It is simpler and flexible for application than the conformal transformation method. Compared with the integral equation method and spectral domain method, this new method is more obvious in physics, and also not involved in the troubles for selecting base functions and relative converging. The numerical results shown here for several examples are good in agreement with those in references.