An Equivalent Modeling Method for the Radiated Electromagnetic Interference of PCB Based on Near-field Scanning

Since the structure complexity of a PCB makes its EMI modeling be very difficult or impossible, an equivalent modeling method to predict the electromagnetic radiation of a PCB is presented by means of a dipole array based on near-field scanning. Firstly, the equivalent modeling method is theoretically derived and its accuracy is validated by a commercial full-wave tool. Then, the equivalent model is applied to predict the electromagnetic coupling of different parts on a PCB and the electromagnetic leakage of a PCB in an enclosure with numerous small apertures. The results show that the proposed method has high efficiency and acceptable accuracy.