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Modeling The Microwave Frequency Dielectric Properties of Thermoplastic Composite Materials

Published online by Cambridge University Press:  25 February 2011

Mitchell L. Jackson  and
Curtis H. Stern
Mitchell L. Jackson
Affiliation:
Virginia Polytechnic Institute and State University, Department of Mechanical Engineering, Blacksburg, VA 24061-0238
Curtis H. Stern
Affiliation:
Virginia Polytechnic Institute and State University, Department of Mechanical Engineering, Blacksburg, VA 24061-0238
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Abstract

Mixture models were studied in an effort to predict the microwave frequency permittivities of unidirectional-fiber-reinforced thermoplastic-matrix composite materials as a function of fiber volume fraction, fiber orientation relative to the electric field, and temperature. The permittivities of the constituent fiber and plastic materials were measured using a resonant cavity perturbation technique at 9.4 GHz and at 2.45 GHz. The permittivities of the composite specimens were measured using a reflection cavity technique at 9.4 GHz and at 2.45 GHz. Simple “rule-of-mixtures” models that use the fiber and plastic permittivities have been found to approximate the complex dielectric properties of the composite for varied fiber volume fractions. The permittivities of oriented composites were modeled using a tensor rotation procedure. Composite permittivities were modeled with temperature up to the glass transition temperature of the thermoplastic matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 601
Copyright
Copyright © Materials Research Society 1992

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References

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