Accurate calculation of the capacitance matrix of a multiconductor transmission line in a multilayered dielectric medium

An integral equation method for the calculation of capacitance and inductance matrices is presented. The method is suited for multiconductor transmission lines embedded in a multilayered dielectric medium on top of a ground plane. Conductors of arbitrary polygonal cross section can be handled as well as infinitely thin conductors. The method is new in two respects: the kernel of the integral equation is the space-domain Green´s function of the layered medium and the accuracy of the solution is improved by using basis functions which exactly model the singular behavior of the charge density in the neighborhood of a conductor edge. Numerical examples show the accuracy of the calculations and the complexity of the configurations that can be treated. Two numerical examples are presented: a thin microstrip line are circular wires in a three-layer dielectric medium.<>