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Modeling the structural return loss in twisted pair cables

The paper presents the results of a computer simulation for non-uniform twisted pair cables. The non-uniform transmission line is modeled as a chain of homogeneous line segments, where an equivalent linear two-port circuit replaces each homogeneous line segment. The accuracy of the segmental model can be made good enough by choosing short segments relative to signal wavelength. Examining the influence of only one parameter can reduce the model complexity. A computer simulation has been carried out for periodic and random changes of twisted pair wire distance.