Dielectric properties of natural materials

We report a novel method for the determination of the dispersive dielectric properties of natural materials exhibiting high dielectric losses over a wide frequency range. Our method is based on a comparison between measured and calculated scattering parameters of a section of coaxial transmission li...

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Bibliographic Details
Main Authors: Oswald, B., Erni, D., Benedickter, H.R., Bachtold, W., Fluhler, H.
Format: Conference Proceeding
Language:English
Subjects:
Coaxial components
Dielectric losses
Dielectric materials
Dielectric measurements
Dispersion
Frequency
Ground penetrating radar
Parameter estimation
Scattering parameters
Transmission line measurements
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Summary:We report a novel method for the determination of the dispersive dielectric properties of natural materials exhibiting high dielectric losses over a wide frequency range. Our method is based on a comparison between measured and calculated scattering parameters of a section of coaxial transmission line. We use a flexible, physically justified model for the behavior of the dielectric material whose parameters are estimated using a genetic algorithm (GA). Dielectric data is of great importance in a great number of applications like ground probing radar (GPR), time domain reflectrometry (TDR) for the determination of the volumetric water content and microwave based process tomography (/spl mu/PT), an emerging technology in process engineering applications.
DOI:10.1109/APS.1998.701600