A method for measuring complex dielectric constants of liquids is described. It involves the variation of the length of a short-circuited section of transmission line until its input admittance is solely resistive. A novel microwave bridge indicates when this condition is fulfilled and simultaneously measures the admittance. From a knowledge of this admittance and the length of the dielectric-filled section the complex dielectric constant may be readily calculated. Measurements at 1 and 3 kMc with several liquids of diverse dielectric character are in satisfactory agreement with values reported elsewhere.
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S. H. Glarum (1958) studied this question.
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