Lossy Transmission Line Model Based on the Generalized Method of Characteristics

In this paper, an approach for obtaining the rational approximations used in the generalized Method of Characteristics (MoC) transmission line model is developed. Vector fitting is done offline and the proposed model is obtained analytically using pre-determined rational coefficients, the per-unit-length parameters, and the line length. The algorithm is developed for two-conductor transmission line structures with frequency-independent per-unit-length parameters with negligible conductance effects. It is shown that the proposed methodology can provide more accurate results for challenging line modelling problems, such as very long transmission lines, when compared with HSPICE's W-Element.