An Eecient Approach to Transmission Line Simulation Using Measured or Tabulated S-parameter Data

In this paper we describe an algorithm for eecient circuit-level simulation of transmission lines which can be speciied by tables of frequency-dependent scattering parameters. The approach uses a forced stable section-by-section`2 minimization approach to construct a high order rational function approximation to the frequency domain data, and then applies guaranteed stable balanced realization techniques to reduce the order of the rational function. The rational function is then incorporated in a circuit simulator using fast recursive convolution. An example of a transmission line with skin-eeect is examined to both demonstrate the eeectiveness of the approach and to show its generality.