Kitty,

Up in the microwave arena corners are mitred to reduce the effect
of extra capacitance on the corner.

In most high speed digital applications this has negligible effect.

If you look at a corner even with a very fast TDR pulse it is very
hard or impossible to see the effect.

However for much higer frequencies and microwave work mitred
corners are often used.

On your emc question:
I am not sure how the current "knows" where its headed ??
Perhaps someone else can explain if this is myth or legend!

Kind regards
Martyn Gaudion
www.polarinstruments.com
==========================
Design & test tools for
PCB controlled impedance
and signal integrity.
==========================





At 19:38 02/12/2004, you wrote:
>Which trace geometry is best suited for High-Speed RF signals...
>Rounded traces, or Square corners?
>I've heard the theory that if you use corners...
>the current travels straight, then turns to it's location, but any
>EMI/cross-talk noise will continue to try to travel straight and "fall
>of the edge"?  What's your theory on this?
>
>Inquiring minds want to know...
>
>Thanks,
>Kitty
>
>
>
>
>
>
>
>
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