[SI-LIST] Re: PCB Radiated Emissions paper available for download

  • From: Dave Barr <Dbarr@xxxxxxxxxxxxx>
  • To: cgrassosprint1@xxxxxxxxxxxxx
  • Date: Tue, 21 Oct 2003 16:32:09 -0700

Charles,
   There is another article by Bill Ritenour that summarizes the Dockey paper
and provides more detail about the CM phenomena in PWB's, along with several
possible 'fixes'.

 http://www.devicelink.com/mem/archive/98/10/007.html

   -Dave Barr

Charles Grasso wrote:

> To all interested parties:
>
> In recent threads a paper by R. Dockey was recommended as
> light reading. Unfortunately due to copyright reasons
> this paper cannot be made freely available. However,
> the basis of that paper - Asymmetrical Mode Radiation from
> MultiLayer Printed Circuit Boards - has no such restrictions
> and it can be downloaded from the RMCEMC website
>  http://www.ieee.org/rmcemc .
>
> This paper demonstrates that a simple trace over a ground plane
> can produce emissions that fail the FCC Class B specifications.
> This paper was originally offered as a way to measure emissions.
> The purpose of this was to answer the question:
>
> "I welcome measurements from others that supports the statement that traces
> over planes are significant sources of EMI.  So far, no one has presented
> such evidence.  Lacking such evidence, how can anyone make such claims?"
>
> and to offer a measurement methodology.This paper shows
> that changes in the dimensions of the structure
> can and will affect the emissions profile.
>
> Enjoy...
>
> Charles Grasso
> RMCEMC - Chair.
>
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