基于有限元法的耦合微带线分布电容参数的计算

Calculating Distributed Capacitance of Coupled Micro- strip Transmission Lines by Finite Element Method

耦合微带线之间的串扰问题与其分布参数密切相关。本文采用有限元方法分别对接地平面之间的对称耦合微带线、均匀介质中的两条不对称耦合微带线以及位于介质层中的三条耦合微带线等耦合微带线结构进行建模,得到了三种结构的电势分布图,并计算了这三种结构的单位长度分布电容矩阵。与文献中结果对比,计算结果一致性很好,方法可行有效。

The Crosstalk between coupled micro- strip lines is closely related to distributed parameters. In this paper,the finite element method is used to calculate the distributed capacitance matrix of coupled micro- strip lines. Threedifferent models are simulated,which are embedded between ground planes,in a homogeneous medium,and in a three- layered dielectric layers. The potential distributions of these models are illustrated,and the distributed capacitance matrices are calculated. The results are compared with those obtained by previous investigators. They are in good agreement,and the method is feasible.