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A technique is presented for accurately determinhg the dielectric constant of microwave materials. The concept is to resonate a cutoff circular-waveguide cavity by inserting the dielectric-disk sample. Unlike most dielectric measurement techniques which rely on perturbation methods, this one determines the dielectric constant from the absolute measurement of the resonant frequency. Also, the use of a cutoff cavity prevents false dielectric constant readings by eliminating spurious resonances.
Microwave Theory and Techniques, IEEE Transactions on (Volume:20 , Issue: 3 )
Date of Publication: Mar 1972