Dielectric Model

Hello,

I'm trying to solve for dielectric properties of a composite using periodic boundary conditions on a representative volume element (cube). I would like to apply a background field, rather than a voltage potential on two faces, so that I can have fully periodic boundary conditions. The only way I have found to do this so far is via the RF module. Is there another way this can be done? How would I go about solving for the periodic response of the system, in particular any phase shift, if the background field is AC.

Thanks,

Denise