Prediction of anechoic chamber radiated emissions measurements through use of empirically-derived transfer functions and laboratory common-mode current measurements

In this study common-mode current measurements made in a laboratory (without an anechoic chamber) were correlated with radiated emissions measurements (made in an anechoic chamber) over a broad frequency range. The goal was to evaluate the use of current measurements as an alternative to avoid repeated testing of an electronic device in an anechoic chamber while improvements are made to the device during the design phase. Empirical transfer functions based on current and field measurements made in an anechoic chamber are used with laboratory (nonanechoic chamber) measured common-mode current data for prediction of radiated emissions. Comparisons are made between the fields data measured in an anechoic chamber and the predicted fields data based on the laboratory common-mode current measurements.