Journal
ELECTROMAGNETICS
Volume 25, Issue 1, Pages 69-79Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02726340590522247
Keywords
planar composites; dipole resonance; microwave permittivity
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The resonant frequency of long conductive fibers embedded in an anisotropic composite as a function of layer thickness is studied both numerically and experimentally and is discussed in terms of the equivalent permittivity of the layer. A simple empirical exponential law is suggested to fit the thickness dependence of the equivalent permittivity. The law involves a critical thickness value, below which the layer can no longer be treated as a bulk material for a fiber of given length and thickness. The critical thickness is retrieved from numerical data for different permittivity values of isotropic and anisotropic layers and for different fiber length.
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