Best I can tell, this rule originated with Mike King. The earliest =
reference I found is Mark Montrose's "Printed Circuit Board Design =
Techniques for EMC Compliance," pg. 26. I have not found any numbers - =
analytical, simulation or measurement - which indicate the effectiveness =
of this technique over frequency. Intuition (a dangerous thing for this =
digital designer to rely upon) tells me that the dimensions of the =
fringing fields are small, thus only affecting GHz-range signals. Is =
this technique currently only of interest to cell 'phone designers, or =
do we need to begin applying this technique to digital PBW design?
Mark Freeman
[email protected]
Stratos Product Development, LLC
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