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Electromagnetic Properties of Syntactic Foam Composites

Published online by Cambridge University Press:  15 February 2011

Paul J. Kemper  and
Rick Moore
Paul J. Kemper
Affiliation:
Signature Technology Laboratory, Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, GA 30332. This work was supported by the Naval Research Laboratory, Contract # N00014-93-K-2037
Rick Moore
Affiliation:
Signature Technology Laboratory, Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, GA 30332. This work was supported by the Naval Research Laboratory, Contract # N00014-93-K-2037
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Abstract

A numerical model based upon renormalized effective medium theory will be described. The model successfully predicts the frequency dispersive permittivity of finite thickness dielectric/ conducting microsphere composites, electrically lossy syntactic foams, where the conducting particulates have volumetric fraction of 0 to 50%. The composites display unique frequency dispersions which are associated with the composite dimensionality and fractal-like sphere surface morphology. Theory and measurement show the composites have critical volume fractions which can be 20% above theoretical values for conducting spheres, i.e 27-–31% and the frequency dispersion of the composite permittivity can be varied by controlling the nanoscale surface morphology and composite thickness. Supporting permittivity measurements in the frequency range of 1–100 GHz will be presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 372: Symposium W1 – Hollow and Solid Spheres and Microspheres--Science and Technology , 1994 , 187
Copyright
Copyright © Materials Research Society 1995

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