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Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
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TITLE |
Modeling the Complex Permittivity of Thermoplastic Composite
Materials [PDF] |
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AUTHORS |
M. Jackson and C. Stern 1992 27 2 103-111 |
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Abstract Several models have been
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 moisture content.
Specimens of the composite were tested at 9 GHz using a shorted waveguide
technique. Simple “rule-of-mixtures”
bonding models were found to approximate the composite permittivities
for varied fiber volume fractions. The permittivities
of oriented
composites were modelled using a tensor rotation
procedure. Moisture, especially free
water, was found to have a strong effect on the loss factor of the composite. Key
Words: Composite materials, Permittivity, Mixture models, Dielectric measurements, Microwave processing. |
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