Abstract
In this paper the average value between the electric fields, in the ferroelectric layer is assigned to the electric field of the ferroelectric layer. This method reveals good performance for low value of the ferroelectric thicknesses. Furthermore a more precise method is proposed in which the ferroelectric layer is divided into the one region at the gap between the strips and two regions below the strips and constant relative permittivities are assigned to these regions. Applying the method for the structures with different dimensions, approves the accuracy of the method.