SDI (strategic dual image) solution of PCB (printed circuit board) containing magnetic material

One way to control electromagnetic interference (EMI) generated on a printed circuit board (PCB) operating at high frequency is to cover the power layer by a magnetic thin film. The device modeling makes it possible to analyze electromagnetic features and then to optimize the device performances. This paper presents the finite element modeling of a 2D axisymmetric, magnetodynamic, unbounded problem composed of a PCB containing a Mn-Zn ferrite thin film. Hysteresis is taken into account in the computation. The final solution is obtained by using the strategic dual image method (SDI). The results show especially the good performances of this device configuration at high frequency, up to 1 GHz.