Use of the method of moments to find the charge densities andcapacitances of a shielded twisted pair transmission line

摘要

The surface charge densities and associated capacitances of ashielded twisted pair transmission line are found for quasi staticconditions, under balanced and longitudinal excitations. The unknowncharge density is expanded in a Fourier series. The series is used asbasis functions for a method of moments solution to find the unknownseries coefficients. This paper describes the geometric structure andthe formation of the integral equation that describes the potentialdistribution as a function of the unknown charge densities. Thesimplifying approximations made are pointed out, as well as thelimitations to the solution caused by the approximations