On field-to-wire coupling versus conducted injection techniques

Use of conducted injection techniques to model radiated susceptibility/immunity coupling has caused considerable debate regarding its validity. The author presented a paper on this subject at the 1997 IEEE EMC Symposium in Austin (Javor, 1997). This paper serves as a summary describing results of that effort, explaining under what conditions conducted and radiated techniques can be correlated. At frequencies where transmission line and antenna effects are minimal, conducted immunity techniques provide excellent correlation with analytical and empirical predictions of radiated coupling. From a practical standpoint, conducted injection techniques provide realistic coupling at frequencies and amplitude levels that would be uneconomical to achieve with traditional radiated techniques