Short Pulse Propagation through Dispersive and Lossy Dielectric Materials: Time-Domain Simulation

This paper presents time-domain simulation results of electromagnetic pulse propagation through dielectric slabs having dispersive, complex susceptibility. The linear material used in the simulation has a Lorentzian dielectric constant with a single resonance. The effect of the resonant frequency on the pulse propagation is studied. An accurate transmission line modelling method based on the stub-technique is used to simulate Lorentzian susceptibility. It is shown that due the presence of resonance in permittivity, imaginary part of the complex permittivity may become significant in the vicinity of frequencies of interest, giving rise to losses.