FreeLists / si-list / [SI-LIST] GND is perfect conductor?

["Loyer, Jeff" <jeff.loyer@xxxxxxxxx>]

We routinely assume perfect conductors for ground in our field solvers.
In fact, I don't believe you have an option of doing otherwise for ADS
(I've got a request in for information on this, but can't get a reply
until next week).  And, for XFX, I don't know whether it comprehends any
skin effects of the Ground plane (it  says it applies the default rho
for resistivity, but I don't know what that does for an infinitely wide
conductor).  Ansoft  Q2D, on the other hand, allows setting the
characteristics of the ground plane (since it's just another conductor).

I would expect that, at  current (>5GHz) frequencies, the ground plane
losses would have a significant effect (the current in the ground plane
would be a mirror image of that in the signal conductor), including skin
effects.   The Hall, Hall, McCall book even gives a formula for the
effect (page 80).  But, our simulators don't seem to take it into
account.

1) Does anyone have any information (data would be preferred, vs.
conjecture) on the effects of using a perfect vs. imperfect conductor
for ground?

2) If ground plane losses don't have any effect, why don't they?

3) If ground plane losses do have an effect, how do you properly model
them in XFX and/or ADS?

Jeff Loyer=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu