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In the present paper, we have proposed an approach of the leakage magnetic field source searching of a micro processing unit (MPU)on a practical printed circuit board (PCB)from a locally magnetic field distribution. At first, the Fourier multi-resolution analysis was applied to locally measured magnetic field distributions. Secondly, we have calculated a current distribution by using a new approach based on the minimum norm method. Numerical simulations were carried out in order to verify our approach. As a result, the results have verified that the approach is capable of applying to the magnetic field source searching of the practical PCBs.

Leakage Magnetic Field Source Searching of Micro Processing Unit on Printed Circuit Board