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- W2069807371 abstract "An experimental method of measuring the dielectric constants of solids is described for the case of medium and high loss materials. The dielectric sample is enclosed within a section of wave guide terminated by a reflecting plane, and measurements are made of the standing wave ratio and position of the voltage minimum for both a short-circuit and an open-circuit termination. The equations for the dielectric properties of the substance may then be expressed in a relatively simple form in terms of elementary functions for media having tanδ ≥ 0.03. In order to obtain reasonable accuracy for the determination of the loss factor of low loss materials using only standard wave-guide components, it was found to be necessary to adjust the operating conditions to obtain maximum power absorption by the dielectric sample. A frequency variation method of obtaining this maximum loss sensitivity is described, the apparatus being the same as that used for the medium and high loss materials. A set of experimental values is given for the dielectric constants of a group of common plastics at 24,000 mega-cycles. A brief analysis of the effect of certain of the equipment losses is included." @default.
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- W2069807371 date "1948-12-01" @default.
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- W2069807371 title "Dielectric Measurement Methods for Solids at Microwave Frequencies" @default.
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