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Abstract
Effective field method is applied for the calculation of the phase velocities and attenuation factors of plane monochromatic electromagnetic waves in a dielectric medium with an array of spherical inclusions. The results of calculation are investigated in a wide region of the volume concentrations of inclusions and frequencies of the exciting field. The influence of the space distribution of the inclusions on the effective velocities and attenuation factors is studied. The obtained results together with experimental data given in literature allow to evaluate the region of the application of the effective field method for the solution of the considered problem.