Stochastic estimation of common mode radiated emission from a transmission line

Accurate estimation of an EMI characteristic of a given circuit at design stage is very difficult because of many uncertainties of parameters in the circuit. This is especially true when the symmetry of a circuit is broken in manufacturing, which was supposed to be in symmetry in the first place. When the symmetry is broken, quite a lot common mode radiation could be occurring, which is not easy to predict for a circuit designer at the design stage. In this paper, we propose a new simulation methodology for estimating common mode radiated emission from a transmission line using a generalized polynomial chaos (gPC), which is based stochastic approach, and show its validness to predict the common mode radiation from a transmission line.