Numerical analysis of field coupling to microstrip circuits

Analysis of field coupling and emissions from printed circuit boards (PCBs) is important for assessment of the immunity of the PCB to external radiation. Immunity of electronic systems is now tightly regulated in consumer markets. This paper presents a procedure for the analysis of susceptibility of PCBs. The procedure identifies a finite set of source and field points to increase the efficiency of the numerical testing. Reciprocity is used to decrease the number of external source locations that need to be used in the field coupling analysis through performing a radiation analysis. The numerical analysis of the PCB is performed using the Method of Moments (MoM). Numerical examples for the application of method are included. Further examples of the overall procedure will be presented.