Parasitic capacitance removal with an embedded ground layer

One of the major goals in designing integrated EMI filters is to improve their high-frequency characteristics. To achieve this, special technologies need to be developed, including the mechanism for suppression of the equivalent parallel capacitance (EPC). In previous studies, there were several methods used to reduce this parasitic capacitance, but in this paper shifting and redistributing the energy stored between windings is the solution proposed. For planar structures, the way to put this method into practice is an embedded ground layer inserted between winding layers. The results contained in this paper present the influence of the embedded ground layer and it´s parameters on the structural winding capacitances.