ABSTRACT
Judging by the response from attendees of seminars, this chapter may be the least popular with design and system engineers.
The concept of radiation from, and coupling to, interface cables, printed circuit board (PCB) tracks, wiring, etc., is generally foreign to engineers, despite involvement with equipment containing digital, analog, radio frequency (RF), and control circuits. The reason may be that it is difcult to envisage interconnections as antennas or circuit elements or to see the potential for crosstalk between conductors. This is particularly true when equipment exhibits EMI or fails an EMC requirement, and the engineer is under the pressure of schedule to nd the quick x usually demanded by the management. In order to make simple EMC predictions or solve an EMI problem efciently, an understanding of the principles of radiation and coupling, including frequency dependency and resonance effects, is essential.
