Hd. Choi et al., FREQUENCY DISPERSION MODEL OF THE COMPLEX PERMEABILITY OF THE EPOXY-FERRITE COMPOSITE, Journal of applied polymer science, 66(3), 1997, pp. 477-482
The factors that influence the complex permeability of the epoxy-ferri
te composite were investigated, and the frequency dispersion behavior
model for the complex permeability was proposed. The complex permeabil
ity of the composite was measured by an impedance/gain phase analyzer
and a network analyzer in the frequency range from 1 MHz to 5 GHz. The
permeability of the composite was increased with increasing particle
size. The frequency dispersion behavior was found to be dependent on t
he porosity of the composite at a given particle size and ferrite cont
ent. The relaxation curve of the complex permeability became broader a
nd flatter as the porosity increased. The equation proposed in this ar
ticle coincided with the frequency dispersion behavior of the complex
permeability of the composite fairly well. It was also found that the
variation of sigma and nu had a close relationship with the shape vari
ation of the frequency dispersion curve, and that sigma and nu were th
e parameters related to the porosity, particle size, and particle size
distribution. (C) 1997 John Wiley & Sons, Inc.