Sur la determination de la permittivite complexe des materiaux a tres fortes pertes

The characterization of materials having a high dielectric constant and a large loss angle presents great difficulties, notably due to the very slight phase shift to be determined. From the analysis of the propogation for dielectric materials (in rectangular wave guides and coaxial lines) a new experimental technique is proposed for coaxial lines using the properties due to the impedance shifts which allows the worthwhile increase in the accuracy of the measurements.