Time-domain two-port representation of some nonuniform two-conductor transmission lines

This brief proposes a new procedure to extend to nonuniform transmission lines, a time-domain model commonly used to describe uniform transmission lines. The line is represented at its terminations as a dynamic two-port, where each port is composed by a dynamic one-port connected in series with a controlled voltage source. The procedure is applied to nonuniform lines with exponential, linear and Gaussian profile of the parameters. The numerical analysis of some case-studies is carried out.