capacitive coupling

A simple antenna positioned right on your bench can reveal radiated emissions in real time. Learn how to separate product harmonics from ambient RF noise, track down capacitive and inductive coupling paths, and use copper tape and foil to hunt down leaky seams and apertures.

Adding a guard trace between PCB traces sounds like a simple crosstalk fix — but grounding it wrong can actually make interference worse, not better. See how capacitive and inductive coupling respond differently to grounding placement, and why one counterintuitive result changes the design approach.