Journal
JOURNAL OF APPLIED PHYSICS
Volume 89, Issue 8, Pages 4486-4490Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1352683
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The present study extends our previous work that concerned the effective permittivities and absorptivities of particulate composites consisting of graphite-type microsphere inclusions in a dielectric matrix, and their suitability as radar-absorbing materials. Whereas in that work spheres of one size (radius a=50 mum) had been considered only, we here study the dependence of the results on the sphere radius of up to one or several millimeters, and find sizable effects on permittivities for a greater than or equal to1 mm, and below that for the absorptivities, indicating the increasing importance of multiple scattering effects. While the multiple-scattering formulas utilized here are based on a low-frequency approximation, we devise a modification of these formulas in order to extend their validity to higher frequencies (or larger particle sizes). (C) 2001 American Institute of Physics.
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