Numerical Modeling of Fringing Fields and their Use for Complex Permittivity Measurements at High Frequencies
Interim rept. Feb 1991-Jan 1993
KING'S COLL LONDON (UNITED KINGDOM) DEPT OF PHYSICS
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An accurate technique to measure the complex permittivity of materials based on a rigorous theoretical formulation of the admittance of an open-ended coaxial probe has been achieved. The technique was tested by measurements on standard solutions. The new technique was used to perform a comprehensive study of ionic solutions. The extensive data obtained led to the development of models to predict the dielectric parameters of ionic solutions at a given temperature as a function of concentration. The theoretical study and numerical techniques were extended to treat the case of a thin sample backed by a metallic plane. The technique was tested with standard solutions. Further analysis led to the development of expressions for the field in the sample adjacent to the probe. This enabled the pattern of power deposition to be determined and improved our understanding of the sampled volume. Complex permittivity, Open-ended coaxial probe, Power deposition pattern.
- Electricity and Magnetism