The Time Domain Propagator Method for Lossless Multiconductor Quasi-TEM Lines

A time domain propagator method is developed to solve telegraphers equations for coupled lossless multiconductor quasi-TEM transmission lines. The resulting expression is obtained in a form in which the propagator operates on the line voltage and current. Examples are presented showing that exceptionally accurate results are obtained for uniform and nonuniform coupled microstrip lines. The lack of numerical dispersion with the propagator method is demonstrated through an examination of two coupled microstrip lines.