By assigning three conductors to any signal or power link between two units of equipment in any electrical system, a circuit model can be created which enables the interference coupling mechanisms of that link to be analysed. This article shows how such a model can be derived from the equations of Electromagnetic Theory.
Back in the time when Circuit Theory was in its infancy, the existence of electromagnetic interference (EMI) was deemed to be of little significance. Engineering judgement at that time was that it could safely be ignored. Since then, the development of valves, transistors, integrated circuits and the Internet of Things has created a situation where ignoring EMI is no longer an option.
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