Dispersive transmission line model for nonlinear time domain circuit analysis

A dispersive transmission-line model for time-domain circuit analysis is presented. The model includes skin effect and dielectric-loss frequency dependence. The line is modeled using short nondispersive line sections separated by lossy lumped circuits. The loss circuit consists of a series impedance due to the skin effect losses and parallel admittance due to the dielectric losses. The model presented includes a powerful numerical implementation where the line is described externally as a two-port. Internally the model is composed of electrically decoupled sections, thus enabling parallel computation. A numerical example of a coaxial cable circuit is presented, comparing the results with those obtained by frequency-domain analysis and the FFT (fast Fourier transform).<>