Time-domain modeling of lossy substrates with constant loss tangent

Abstract

Lumped models that represent a lossy substrate with constant loss tangent over a given bandwidth are presented. Two network representations are given, which are based on the continued fraction expansion (CFE) of a causal network function, and the Debye model. Proposed models are compared with per unit length conductance and capacitance extracted from measurements of a stripline using the calibration comparison method.