Dielectric permittivity of fiber-filled composites: comparison of theory and experiment

Microwave dielectric properties of fiber-filled composites attract considerable attention due to their numerous applications. We present results of experimental investigation of the dielectric properties that reveals a great variety of types of dielectric dispersion in these materials. The experimental data appears to be in rather good agreement with recent theoretical approach [1]. Moreover, the data confirm the original assumption that permittivity of effective medium is scale-dependent in such composites.