2Why Call EMI Filters Black Magic?
In some cases, engineers—both designers of electromagnetic interference (EMI) devices and others—call EMI black magic. As we have already said in chapter 1, it is nothing of the sort. There are, however, several main reasons for this misconception. First, there is no definitive mathematic solution or well-defined design method that can be applied to all EMI filters due to the unique application in each case and the variability in both source and load impedance over the frequency bands of interest. These two factors provide significant challenge, even more so if the filter is required to meet very stringent requirements such as MIL-STD-461 for CE101 and CE102.
Another reason why EMI filter design has some level ...
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