The permittivity and permeability behaviors of composites made from the multiwalled carbon nanotubes with magnetic impurity Ni and the wax have been studied in 3-18 GHz. The unusual permittivity dispersion behaviors have been explained based on the Cole-Cole model and the conductivity contribution model. Permeability is found to have negative imaginary parts within 3-11 GHz. The composites are found to show good microwave absorbing performances (reflection loss <-20 dB): matching thickness is 1.5 mm and absorbing frequency band is 11.6-12.4 GHz, and the absorbing performance can be explained by the geometrical effect. (C) 2007 American Institute of Physics.
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