Analyse and research of radiated emission on PCBs

This paper presents a study of radiated emission´s mechanism and radiated electromagnetic field estimation. Based on the electric dipole module, two sorts of module which could explain the mechanism of radiated emission are proposed. Furthermore, through utilizing EMSCAN system, a simple approach is presented for estimation of radiated electromagnetic field generated by radio frequency current in the cable. This paper also summarized an EMI diagnosis method. According to this method, we could easily find the source of radiated emission, which is the basic and important part of EMC improvement. The experimental research shows that radiated noises decrease obviously after circuit improvement. Therefore, the presented approach proves effective and efficient.