RE: [SI-LIST] : How to construct guard bands in Ansoft 2D

Michael Tsuk (Michael.Tsuk@digital.com)
Fri, 29 May 1998 13:50:24 -0400

Eric,

> In the problem set up, each of the traces, signal and ground traces
are drawn, in
> addition to the planes. In Maxwell 2D Extractor, only one conductor
can carry the return
> path (ie, be labeled ideal ground), so all the conductors that are to
be grounded; the
> "guard traces" and the planes, are grouped under the same name-
labeled "ret_path",
> for example.

I'm not sure this is the best way to do this. Charles Grasso was
particularly interested
in the effects of the vias that periodically connect the guard traces to
ground. I think
you would do better to leave the guard traces as "signals" and connect
their ends to
ground in your circuit simulator. That way, you allow for the effect of
standing waves
on the guard traces, which can happen if you don't have enough vias
connecting them
to ground.

-- 
Michael Tsuk
Michael.Tsuk@digital.com

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