[SI-LIST] Re: EMI and Power plane card edge clearance distance
- From: "Mary" <mary@xxxxxxxxxxxx>
- To: "'SI-List Discussion Group'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 7 Aug 2001 08:57:19 -0500
Doug,
Are you saying that the 20-H rule only works when the board
is bolted to a chassis? When you say the 20-H rule "really
works", what do you mean? What kind of experiment could be
done to demonstrate the effectiveness of this rule?
Mary
-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
>[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Doug McKean
>Sent: Friday, August 03, 2001 11:04 AM
>To: SI-List Discussion Group
>Subject: [SI-LIST] Re: EMI and Power plane card edge clearance distance
>
>The results of that paper are very debatable, IMO. It was
>a simulation of board floating in air. It has no correlation to
>securing a similarly constructed board to a chassis by way
>of ground studs in the real world.
>
>That this rule really works is a whole other matter.
>
>- Doug McKean
-----
"winson yu": wrote
>
> Hi Stacy,
>
> You may check out a paper titled "Effects of 20-H Rule and Shielding
Vias on
> Electromagnetic Radiation From Printed Circuit Boards" presented at
> EPEP2000. The paper concluded, from both theoretical analysis and
numerical
> computation, that for the two-plane structure, 20-H rule yields more
> radiation than the normal structure. Also the numerical result
shows that
> the usage of shielding vias would cut down the radiation
effectively.
>
> The link to the paper and the presentation (with additional cases
study) is
> at http://www.sigrity.com under the heading Support and Technical
> Documentation paper # 2.
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