Complex Electromagnetic Properties of Composites
In Chapters 2 through 4, the static electromagnetic properties (conductivity, permittivity, and permeability) of composite materials were discussed. In this chapter, the dynamic electromagnetic properties of composites subjected to sinusoidal timevarying electric and magnetic fields are discussed. The electromagnetic properties of interest are effective complex relative permittivity (εe*) and complex relative permeability (μ*). As effective complex conductivity (σe*) is related to effective complex relative permittivity (εe*), it is not considered separately. The most interesting feature of the complex electromagnetic properties is their dependence on the frequency of the applied alternating field. The variation of electromagnetic properties with frequency is referred to as dispersion in the literature. Both “dielectric dispersion” and “magnetic dispersion” are discussed in this chapter.