EMI filter mismatched impedance and EMI suppression

EMI(electromagnetic interference) filter can furthest attenuate conducted EMI.Analyses insert loss and reflect loss under mismatch impedance conditions and proposes the decision principle of EMI filter.The mismatch principle is proposed to reduce the influence of mismatch impedance on insert loss during the design and select of the EMI filte.The experiment results confirm the validity of the mismatch principle.