Measurement of dielectric properties of low-loss ceramics at microwave frequencies

Although the measurement of dielectric properties of materials at microwave frequencies by resonant-cavity techniques is well established, care must be taken when interpreting the results of measurements on pure materials with very low losses. This paper describes an H01n resonant-cavity system and analyses the influence of the degenerate E11n mode on the measurements. Some results of measurements at 9.4Gc/s on debased-alumina samples are given.