An efficient approximation method for delay-rational model of multiconductor transmission line

In this paper, a new algorithm for the generation of the approximate poles and residues of multiconductor transmission lines characterized by frequency-dependent per-unit-length parameters is presented. Based on the Green's function-based delay-rational model for lossy transmission lines, which performs a reduced number of rational functions for the open-end impedance matrix, the proposed algorithm is more efficient by performing the poles and residues approximation comparing with solving high order equation. And the frequency response and transient analysis results have been considered when compared to the delay-rational model calculated. The results show that the proposed method can achieve an over seventy percent speed-up while keeping a good accuracy.