Time-Domain Techniques for Measuring the Conductivity and Permittivity Spectrum of Materials

A method is presented for evaluating the conductivity and permittivity spectrum of materials by using time-domain reflectometry. A theoretical analysis of the transient response is made, with emphasis on the asymptotic behavior for large values of time. The results of the asymptotic analysis are the basis of the presented method and are essential for the evaluation of the permittivity spectrum of conductive materials. Quite satisfactory experinental results are presented.