A common-mode skeleton model for EMC Simulations
Systems that consist
of printed circuit boards with various digital and analog components, connecting
wires and metal enclosures can show complex electromagnetic behaviour.
A model is reviewed that allows for the calculation of the most important
contribution to the emitted radiation from such systems. In this model
the radiation is driven by common-mode voltage sources. The physical origin
of these voltage sources is explained and the relevant electric field integral
equation is derived. When planes are discretized by wire grids, the resulting
equations can be analysed by means of a program like NEC. Such a program,
named Berber, is presented. A few results of real-life examples are shown. |