The correct ETLC model for anisotropic lossy materials-a comment on "Transient propagation in anisotropic laminated composites"

S. He comments on a paper by Lin et al. (IEEE Trans. Electromagn. Comp., vol.25, no.3, p.357-65, Aug. 1993). Lin et al. wanted to calculate the transient response for a plane wave obliquely incident on a multilayered structure consisting of anisotropic lossy materials. They first derived an equivalent transmission-line-circuit (ETLC) model for the anisotropic lossy materials, and then used a standard circuit analysis program (PSPICE) to calculate the transient response. The method is efficient and it enables one to use the existing computer code. However, He believes that the Lin et al. ETLC model for anisotropic lossy materials is not correct. He derives and presents the correct one.