This article examines the interaction of millimeter wavelength radiations with polyacrylonitrile (PAN) graphite fibers in the carbon conductivity range that is primarily absorptive. Two sets of fibers were examined: the first fiber type, designated as AG (as grown), has the conductivity of PAN graphite (7 × 104 MHO). The second set, designated as type HT (heat treated to ∼2500 °C), has a measured conductivity that is about 8.5 times the conductivity of carbon. The absorption coefficients of the two carbon fiber types were examined as a function of diameter for fibers with fixed length at a fixed frequency of 35 GHz, and the length of the fibers was the principal resonant length (i.e., size parameter of ∼1).
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