Review of Scientific Instruments · 1967 · 14 citations · 1 references
Natural SciencesElectrical EngineeringMaterials ScienceMaterials CharacterizationMaterials PhysicsMicrowave EngineeringDielectric PropertiesDielectric ResponseDielectricsMicrowave MaterialsMicrowave MeasurementsPowder TechnologyCharacterization Of Microwave MaterialsDielectric CharacterizationDielectric ConstantDielectric Constant MeasurementDielectric MeasurementMicrowave Dielectric PropertiesPermittivity MeasurementPowder Characterization
A system has been developed to measure the dielectric properties of powder materials using X band microwave frequencies. The measurement is conducted in a microwave cavity oscillating in the TM012 mode and resonant at 9.4kMc. Relatively small amounts of material are needed, and samples are introduced into the cavity using a quartz tube. The limitation of the perturbation theory as a basis for computation is examined experimentally. The suitability of different equations correlating the apparent dielectric constant of the powder material with the intrinsic values of the solid (crystalline or fused solids) is demonstrated by the data.
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