An Effective Source Reconstruction Method of EMI Sources in Shielding Based on Phaseless Near-Field Scanning

An effective source reconstruction method (SRM) of EMI sources in shielding is proposed in this paper. Considering that the radiation strength of real EMI sources with shielding will too weak to be measured in practical cases, near field is scanned when the device under test (DUT) is not covered by a shielding. By employing differential evolution (DE) algorithm, magnitude-only magnetic fields along x and y directions is measured to obtain equivalent dipole models. Then, the equivalent dipole model can effectively replace the DUT when it is covered by a shielding. After that, both 3 -meter far field of EMI sources with shielding and coupling power of victim source can be predicted precisely.