The effect of a thin ferroelectric film on the propagation characteristics of a microstrip transmission line

The properties of a microstrip line (MSL) on a bilayered substrate containing a thin ferroelectric layer are theoretically studied. The propagation parameters are calculated using an approach based on a two-dimensional full-wave electrodynamic model. The influence of the fringing electric field in the ferroelectric layer on the MSL characteristics is studied. It is shown that correct modeling of microwave devices based on bilayered substrates with ferroelectric layers must take into account the properties of these layers even despite very small thickness.