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