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There are four paths that let undesired signals get into a system: magnetic or inductive coupling, capacitive coupling from high-speed voltage changes (dV/dt), direct coupling, and radiated, or RF, coupling. One may not be able to predict the exact path a noise signal takes, just as one cannot predict the exact path of lightning. Shields merely act as an isolation barrier to a signal. Using one barrier on the source of the noise and one barrier on the receiver typically delivers the greatest integrity. Shields may be necessary, but, ideally, there should be no signal to shield against. It is important to understand what is causing the noise and whether it can be resolved... This post is in categor(y)ies: Practical and tagged: Grounding, shielding, EMI, Shields, PWM, RF signal, Magnetic coupling, Pulse-width-modulation, PWM simulation, EMI noise, CE mark