Faraday cage is an enclosure that shields electromagnetic fields from penetrating into or radiate out of the enclosure. Faraday cages have been around for a long time and are generally used to isolate test equipments or to measure radiated emissions and immunity from a DUT. The concept of Faraday cage works so well that engineers have been using it on PCB designs. But some engineers go to an extreme of using picket fences (ground vias on PCB edges) and believe that they act as a faraday cage while being cost effective. Can this be true? I set out to investigate.

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