Journal
JOURNAL OF MATERIALS RESEARCH
Volume 17, Issue 5, Pages 1232-1236Publisher
MATERIALS RESEARCH SOCIETY
DOI: 10.1557/JMR.2002.0182
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The complex relative permittivity epsilon(gamma) and permeability mu(gamma) of microcoiled carbon fibers (MCCFs) imbedded in paraffin wax were measured at Ku band frequencies (12.4-18 GHz). Both the real and imaginary parts of the complex relative permittivity of the MCCFs/paraffin wax composite decreased with increase of the frequency. The real part of the complex relative permeability of the composite increases with increase of the frequency, and the imaginary part is nonzero and nearly constant over the measured frequency range. The dielectric loss tangent (tan delta(m)), the magnetic loss tangent (tan delta(m)), and amplitude attenuation factor W were determined as well. On the basis of the experimental results, the MCCFs/paraffin wax composite is mainly a kind of dielectric lossy material with small magnetic loss and diamagnetism in the Ku band.
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