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On a multiple-layered PC board the most critical point for antenna design-in is still the ground clearance (GC) area. As previously mentioned, grounding around the GC area is important for proper impedance matching and frequency control. In a multi-layer board all of the layers around the GC area must be connected together to avoid signal coupling/leaking into gaps between the layers. The DC voltage layers can be left floating as long as the metal of that layer does not overlap with the GC area.
PTM Published on: 2011-01-24
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