Numerical simulation of random composite dielectrics. II. Simulations including dissipation

(Received 21 May 1992, accepted 29 May 1992)

Abstract
A simulation model presented earlier for the permittivity of a composite material has now been extended to include the dissipation of energy inside the medium. It is employed to calculate the complex dielectric function of so-called effective media, i.e. randomly distributed lossy particles in an insulating matrix. A general equation formulated before for lossless media proves to be valid also for the dissipative mixtures investigated. However, simulations and experimental data show that small deviations from random distribution can induce large deviations in the dielectric function. Experiments are reported that agree with the simulation results.