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Accuracy of RF Material Characterization Measurements Performed in the Stripline Cavity Resonator

Published

Author(s)

Claude Weil, Chriss A. Jones, Y. Kantor, John H. Grosvenor Jr

Abstract

We examine the sccuracy of the air-filled stripline cavity in measuring the dielectric and magnetic properties of bulk materials in the frequency range of 150-2000 MHz. Measured data on complex permittivity and permeability for several different-sized specimens of dielectric and magnetic materials were compared with reference values obtained using other techniques of known uncertainties. Major differences were noted for both complex permitivity and permeability data, and we largely attribute these to less-than-optimal perturbation of the internal cavity fields by the material specimens under test. The technique is particularly unsuited to measuring the dielectric loss of the higher-permittivity low-loss materials due to energy scatter by the specimen under test. In order to improve measurement accuracy, we suggest guidelines on the range of specimen electric and magnetic volume needed for optimal cavity perturbation.
Citation
IEEE Transactions on Microwave Theory and Techniques
Volume
48
Issue
2

Keywords

cavity, dielectric, ferrite, loss factor, magnetic materials, measurements, permeability, permittivity frequency

Citation

Weil, C. , Jones, C. , Kantor, Y. and Grosvenor Jr, J. (2000), Accuracy of RF Material Characterization Measurements Performed in the Stripline Cavity Resonator, IEEE Transactions on Microwave Theory and Techniques (Accessed April 12, 2024)
Created January 31, 2000, Updated October 12, 2021