Based on the concept of electromagnetic field average

the effective optical constants of mixed particles containing ellipsoidal inclusions were studied with Maxwell-Garnett effective medium theory. The effects of shape scale factors and volume fractions of inclusions on the effective optical constants of mixed particles were analyzed. The results show that: a critical value has been found in the shape scale factors of inclusion. When the shape scale factor is smaller than the critical value

the differences in the effective optical constants of mixed particles containing ellipsoidal and spherical inclusions increase with the growing shape scale factor. Otherwise

little effects are shown in the effects of shape scale factors on the effective optical constants of mixed particles. The value of effective optical constants for mixed particles varies between that for the background and inclusions. With the increase of volume fraction of inclusions

the effective optical constants of mixed particles will approach to those of inclusions.