Dp. Makhnovskiy et al., Effect of transition layers on the electromagnetic properties of composites containing conducting fibres - art. no. 134205, PHYS REV B, 6413(13), 2001, pp. 4205
The approach to calculating the effective dielectric and magnetic response
in bounded composite materials is developed. The method is essentially base
d on the renormalization of the dielectric matrix parameters to account for
the surface polarization and the displacement currents at the interfaces.
This makes possible the use of the effective-medium theory developed for un
bounded materials, where the spatially dependent local dielectric constant
and magnetic permeability are introduced. A detailed mathematical analysis
is given for a dielectric laver having conducting fibres with in-plane posi
tions. The surface effects are most essential at microwave frequencies in c
orrespondence to the resonance excitation of fibres. In thin layers (having
a thickness of the transition layer), the effective dielectric constant ha
s a dispersion region at much higher frequencies compared to those for unbo
unded materials, exhibiting a strong dependence on the layer thickness. For
the geometry considered, the effective magnetic permeability differs sligh
tly from unity and corresponds to the renormalized matrix parameter. The ma
gnetic effect is due entirely to the existence of the surface displacement
currents.