This technical report shows a measurement technique for the complex permittivity of a dielectric thin film with the cylindrical resonator having sliding end plates in the millimeter wave region. In order to eliminate the influence of unwanted TM111 resonance mode which is frequently appeared on the response of TE011 for measurement of the dielectric thin film, the position of the end plates is adjusted adequately. The methodology and experimental results are presented to show the usefulness of this technique.
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