摘要
When the size of inhomogeneous particles in composite material is much smaller than the incidence wavelength, the average dielectric properties can be expressed in terms of effective permittivity ε<sub>eff</sub> which is treated as macroscopically homogeneous. For many years, effective permittivity was usually studied by dipole polarizability as an electrostatic problem.It did not illustrate how the scattering was omitted. Actually, a particulate material can be treated as a random medium whose dielectric constant is randomly fluctuated between particle ε<sub>s</sub> and background material ε<sub>b</sub> The electric properties of such materi-
基金
Project supported by the National Natural Science Foundation of China,Shanghai Applied Physics Centre
Shanghai Research & Development Foundation of Applied Material.
