The electrical constants of dielectrics are the power factor and the dielectric constant, the power factor being that of a carefully insulated condenser using the given material as the dielectric. Losses in a condenser may be represented either as a series or a parallel resistance. If considered as in series, the losses may be determined by resistance variation, and if in parallel, the geometric capacity may be determined. From a consideration of both, the power factor ψ and dielectric constant K may be obtained from simple formulae. An investigation of several solid dielectrics over a band of frequencies ranging from 600,000 to 1,700,000 cycles per sec. showed K to be practically independent of frequency and ψ to change in a way that cannot be predicted. Measurements on about forty commercial dielectrics showed hard rubber to have much smaller losses than any other. Low losses were always accompanied by small dielectric constants, the reverse, however, not always being true.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Guthrie, R. V. Jr.
"Electrical Constants of Dielectrics for Radio Frequency Currents,"
Proceedings of the Iowa Academy of Science, 31(1), 374-375.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/118