where [??] and [??] are, respectively, the phasor representing the dielectric displacement and the electric field vectors, [[??].sub.c] is the complex dielectric function, and the brackets denote an average over the material's volume.
The electrical behavior of an unstressed medium under the influence of an electric field is defined by relationship (1) of the field strength E and the dielectric displacement D (there [epsilon]--the permittivity of medium).
Eventually, the return via is no longer used for any significant amount of return current, and all the return current flows though the dielectric displacement current (and the return via has no impact in the inductance the signal experiences).