Jea48 is right - no grounding needed. We do it in the lab all the time. All you need is a sheet of copper that encloses the unit. If you ever visit radio telescopes, you will see that they line the entire data room with copper foil. Also, bust open a cell phone and you will find the same.
Also, many new switching circuits have a sheet of ferrite polymer that simply sticks down on the surface of the PCB. Ferrite works better than copper at lower frequencies actually (e.g. 60Hz line frequency and multiples thereof) but both sandwiched together gets you even better supression (copper on the outside).
Arthur
Also, many new switching circuits have a sheet of ferrite polymer that simply sticks down on the surface of the PCB. Ferrite works better than copper at lower frequencies actually (e.g. 60Hz line frequency and multiples thereof) but both sandwiched together gets you even better supression (copper on the outside).
Arthur