Incorporation of Kramers-Kronig relationships in the derivation of network representations for modeling and characterizing anisotropic materials

At high frequencies, wave-matter interactions have to be taken into account and the dielectric permittivity can be no longer considered as a constant when scanning a wide frequency band. In this context, broadband measurements will be additionally helpful to develop realistic and suitable models. Kramers-Kronig relationships are seen as efficient tool to derive broad-band equivalent network representations particularly useful for efficiently introducing material anisotropy in time and frequency domains electromagnetic simulation solvers.