Abstract: The radiated emission(common-mode noise) caused by common-mode currents is a major source of modern electronic product radiation,and critical to the compulsory certification of the radiated emission of products.It's of great importance to electronic engineers to study common-mode noise and the techniques for reducing it.Because of the complexity of common-mode noise,the explanations or conclusions in some literatures about the basic problems of common-mode noise are not identical.This may hinder the reseach...