An Effective Equivalent Radiation Source Based on Near-field Scanning for Electromagnetic Interference Estimation

A novel equivalent radiation source method is proposed to take place of the real radiating integrated circuit (IC) in this paper. The method utilizes amplitude-only near-field scanning data to reconstruct equivalent magnetic dipole array, and the differential evolution optimization algorithm is proposed to extract the locations, orientation and moments of those dipoles. By importing the equivalent dipoles model into 3D full-wave simulator together with the victim circuits model, the electromagnetic interference issues in mixed RF/digital systems can be well predicted. A commercial IC is used to validate the accuracy and efficiency of this proposed method. The coupled power at the victim antenna port calculated by the equivalent radiation source is compared with the measured data. Good consistency is obtained which confirms the validity and efficiency of the method.