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Measurement of Axially Inhomogeneous Permittivity Distributions in Resonant Microwave Cavities

Title data

Peter, Ronny ; Fischerauer, Gerhard:
Measurement of Axially Inhomogeneous Permittivity Distributions in Resonant Microwave Cavities.
In: IEEE Transactions on Microwave Theory and Techniques. Vol. 67 (June 2019) Issue 6 . - pp. 2433-2442.
ISSN 0018-9480
DOI: https://doi.org/10.1109/TMTT.2019.2910177

Abstract in another language

The cavity perturbation method is a standard technique for material parameter estimation. It typically assumes that the sample consisting of the material under test (MUT) is small. This and other assumptions are violated in in-process measurement scenarios which involve big and inhomogeneous samples. We analyze the limitations of the classical perturbation method and present a new approach towards the measurement of spatially varying material parameters associated with a large sample in a rectangular or a circular cylindrical microwave cavity. The method is based on the measurement of multiple resonance frequencies and quality factors and is validated by numerical and laboratory experiments. It is demonstrated that relative permittivities and conductivities may be measured with typical accuracies on the order 1 %.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Cavity resonator; complex permittivity; inhomogeneous loading; inverse problem; perturbation method; Q-factor; resonance frequency
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 06 Jun 2019 06:24
Last Modified: 06 Jun 2019 06:24
URI: https://eref.uni-bayreuth.de/id/eprint/48498