Microwave Absorption and Molecular Structure in Liquids. 5. Measurement of the Dielectric Constant and Loss of Low-Loss Solutions.

摘要

The investigations of the twenty-seven liquid organic halides reported and discussed in the first three papers of this series made apparent the desirability of measuring selected molecules in dilute solution in a variety of different solvents. The present paper describes the experimental method employed in these measurements and gives examples to illustrate the data obtained, absolute magnitude of the reflection coefficient for low-loss dielectrics, however, is very close to unity since power absorption by the dielectric-filled waveguide section is relatively small. Because the variation in reflection co-efficient with sample length is very small and thus difficult to measure with any degree of reliability, an alternative approach has been adopted. The voltage standing wave ratio, SWR, is quite sensitive to small changes in dielectric loss since for low loss dielectric the SWR is large. jg p.2.