I am laying out a pcb with a number of external connectors that will have RF common-mode filters at each connector, shunting any common-mode signals to the chassis. However, I'm not sure what is the best way to connect the filters to the chassis to minimize radiated noise within the enclosure.
- There are a number of standoffs that could be used for this, but should all of the CM currents from each filter be run through traces and to a single chassis connection? Or should I use small isolated ground islands and connect them to separate, local standoffs that way?
- If I should use a trace to a single point, should it be routed in a particular way (I was thinking along the edge of the board)? Any tips on how to do this?