Determination of the Complex Permittivity of a Liquid in the Ka Band from the Interference Dependence of the Reflection Coefficient on the Layer Thickness

The applicability of the previously proposed method for determining the imaginary part of the complex permittivity for weakly absorbing liquids in the 25-40 GHz frequency band is considered. Based on the results of 3200 measurements with the data obtained by the open waveguide method were compared. The obtained values are in good agreement with each other.