[SI-LIST] Re: Conductor loss reduction at High Frequency
- From: steve weir <weirsi@xxxxxxxxxx>
- To: tbiggs@xxxxxxxxxxxxxxxxxxxxx
- Date: Wed, 29 Aug 2007 17:40:06 -0700
Tom, for geometries in typical use this does not seem to be a
significant contributor to EMI. Where it might start to become an issue
is if we were to do something foolish like run a big fat trace over
thick dielectric close to and parallel to a board edge. That would make
a nice antenna that both emits noise and welcomes ESD with open arms.
Regards,
Steve.
Tom Biggs wrote:
> From: steve weir
> " EMI issues from microstrip are often greatly overstated. The big
> offenders on a PCB are: the cavity edges, and the components radiating
> above the PCB surface. Doug Smith has some good information on these
> types of subjects. Lee is passionate about his practical experience
> with M/S and no significant EMI issues."
>
> I was thinking more about the effect of making the surface trace wider
> (for lower loss) and further away from the ground plane. I assume that
> this increases EMI even though the impedence isn't changing.
>
> -tom
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