Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Dielectric Properties of Food at 3 GHz as Determined by a Cavity Perturbation Technique I. Measuring Technique [PDF]
AUTHORS	P. G. Risman and N. E. Bengtsson 1971 6 2 101-106
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Abstract After a preliminary study of various methods for dielectric measurements described in the literature, a cavity perturbation method was chosen and developed for measurements on food materials at 3 GHz. A cylindrical TMO10-cavity was designed for measurements on low-loss materials and a TMO12-cavity for materials of high loss. Both permit favorable sample dimensions, simple insertion of samples in glass or quartz tubes, and rapid measurements of a number of replicates. The dielectric constant and loss factor are calculated from the shift in resonant frequency and Q-value or transmission between empty and filled sample tube.