The method of measurement of the dielectric properties of solid dielectrics described by S. Roberts and A. von Hippel has been applied with 3-cm wave-length waves in a rectangular wave guide. In this method the dielectric sample is placed at a short circuited end of the transmission line, and the dielectric properties of the sample, calculated from the position of a minimum of the standing wave and the ratio of the minimum field strength to the maximum field strength of the standing wave. A simplified procedure for calculating the dielectric properties from the measurements is presented. Values are given of the dielectric properties of some common plastic and ceramic materials at lO-cm wave-length and 3-cm wave-length, which were measured with this method.

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The variable length cavity described in this paper was the subject of a t.hesis submitted to the Graduate School of the University of Pittsburgh, in partial fulfillment of the requirements of the M. S. degree.

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