Resonant-Cavity Measurements

Satisfactory methods are described for measuring the resonant frequency, Q, and shunt resistance of resonant cavities. Some of the wavemeters and other equipment developed for these measurements are described. The methods of determining resonant frequencies permit moderate accuracy in absolute measurements and very high precision in the comparison of the resonant frequencies of two cavities. Three methods of measuring Q are described which are similar in principle but different in detail. Shunt resistance has been determined by two methods which are convenient and reliable. By inverting these methods, the dielectric constants and dielectric conductivities of liquids and gases can be measured.