TIME-DOMAIN SIMULATION OF N-COUPLED TRANSMISSION-LINES

A simplified simulation model for a set of coupled lines is presented. The construction of the model is based on two assumptions on the characteristics of the coupling phenomenon. The assumptions are usually satisfied for microstrip lines constructed on multilayer printed circuit boards. To determine the model parameters, only function evaluations are required. The transformation networks necessary at both ends of the model are dependent on the number of coupled lines only and can be determined once. Only two parameters for each line have to be computed to simulate sets of coupled lines with different parameters. The test case presented shows good agreement between the results obtained with the simulation and those obtained by testing a real circuit with a high-resolution oscilloscope. The errors in voltages were less than 1%.