An equation-based method for calculating electromangectic susceptibility on printed circuit board

An equation-based method combing field equations with circuit solver is proposed for calculating electromagnetic susceptibility (EMS) on printed circuit board (PCB). These equations can be simplified to a voltage source and a current source, and then substituted into commercial software to calculate the impact of incident electromagnetic waves on traces on PCB. This paper compares the results calculated by equivalent sources with those done by method of moments (MoMs). Good agreement between those two methods. Finally, a commercial software, SPEED 2000, is used to combine with the equivalent sources to calculate the problems of signal integrity (SI) and power integrity (PI) under the influence of incident electromagnetic waves.