The dielectric or electromagnetic properties of a substance are essential parameters in material engineering and technological development. The electromagnetic properties of materials include the complex permittivity, complex permeability, conductivity and dielectric loss. Nowadays, with the rapid growth of new forms of communication, IoT and metamaterial development, understanding material properties is fundamental. The electromagnetic characterization of materials, besides providing information on the electric and magnetic behavior of the substance, additionally, provide insight on many other structural features. The state, structure, temperature, and the heterogeneity of materials, as well as the concentration of a solution, can be assessed through electromagnetic characterization.