[SI-LIST] Re: 20H rule explanation from W. Michael King
- From: "Brent DeWitt" <bdewitt@xxxxxxxxxxxxx>
- To: <Raymond.Anderson@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 8 Oct 2001 20:02:56 -0600
At the last IEEE EMC Symposium in Montreal, Todd Hubing and UMR folks had an
excellent presentation on an evaluation, both physical and modeled, of the
"20H rule". Very well presented and even handed in spite of the attempt of
the session co-chair's attempt to discredit it at the end. Recommended
reading.
Regards,
Brent DeWitt
Datex-Ohmeda
Louisville, CO
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ray Anderson
Sent: Monday, October 08, 2001 11:58 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 20H rule explanation from W. Michael King
I don't want to add fuel to the 20H "rule" debate, but
just noticed this short paper from EPEP2000 on the web at:
http://www.sigrity.com/papers/epep2000/epep_20h.pdf
Paper is by Chen (of ucsc.edu) and Fang (of ucsc.edu and sigrity.com).
The conclusion states:
"This paper investigates the effects of 20-H rule and shielding vias on the
radiation from the printed circuit board. For the two-plane structure, 20-H
rule yields much more radiation than the normal structure. For the
multiple
plane case, no significant change in radiation is found if the 20-H rule is
applied to the internal planes. Also the numerical result shows that the
usage of shielding vias would cut down the radiation effectively."
Kind of what I've suspected all along.....
-Ray
Sun Microsystems Inc.
>
>
>RJS,
>
>No, I'm pretty sure there's no good information in that
>explanation. It appears to be a parody of the type of
>nonsense that appears on this list from time to time.
>My guess is that it is a hoax of some kind.
>
>Mary
>
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