Title :
Complex Dielectric-Constant Measurements in the 100- to 1,000-Megacycle Range
Author :
Holtum, A.G., Jr.
Author_Institution :
Signal Corps Engineering Laboratories, Fort Monmouth, N.J.
Abstract :
A method is described wherein the dielectric constant and conductivity of lossy materials may be determined quickly and conveniently. A sample of the material is incorporated as the dielectric of a capacitor which acts as a load terminating a slotted measuring line. The complex impedance of this load can be determined by the conventional method from the voltage standing-wave ratio and position of the minimum. The inherent limitations of the method restrict its application to medium- and high-loss materials because of the very high standing-wave ratios encountered as the conductivity decreases. However, the dielectric constant alone may be measured for low-loss materials. Standardized components are used throughout, with the exception of the sample holder.
Keywords :
Capacitors; Conducting materials; Conductivity; Dielectric constant; Dielectric loss measurement; Dielectric materials; Dielectric measurements; Impedance; Transmission line measurements; Voltage;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1950.234125