A CONTRIBUTION TO THE MEASUREMENT OF PERMITTIVITY WITH THE SHORT-CIRCUITED LINE METHOD

The elimination of the ambiguity in the short-circuited line method fo r determining the dielectric permittivity by measuring the change in t he position of the minimum for two similar frequencies is studied.This quantity is used to uniquely determine the coefficients of an algebra ic equation with a single physical solution. Ambiguity may or may not be removed depending on the dielectric characteristics of the sample a nd on the value of the ratio sample thickness/wavelength. The former a re not known a priori and the latter is an experimental parameter, whi ch can be varied. The influence of this parameter on the elimination o f ambiguity is studied. Finally the analysis is compared to results of measurements on several organic liquids.