Accession Number:

ADA270478

Title:

Numerical Modeling of Fringing Fields and their Use for Complex Permittivity Measurements at High Frequencies

Descriptive Note:

Interim rept. Feb 1991-Jan 1993

Corporate Author:

KING'S COLL LONDON (UNITED KINGDOM) DEPT OF PHYSICS

Personal Author(s):

Report Date:

1993-08-01

Pagination or Media Count:

28.0

Abstract:

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.

Subject Categories:

  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE