Re: More on Ground Planes

Norman Wong (Norman.Wong.0139127@nt.com)
Fri, 26 Jul 1996 21:30:19 +0000

Reply to: RE>More on Ground Planes

Hi Frances:

I met a professor in one of the signal integrity symposium and he =
developed an analysis tool which handles a lot of cases, among them, =
discontinue ground plane. You may want to contact him. Here is his =
company's address:

Henri Mekelo, Director
Ultrahigh Speed Digital Electronics.
U of Illinois
1406 West Green Street
Urbana, IL 61801

email: hm@lassi.ece.uiuc.edu

I have no affiliate with him. Good Luck.

Norman Wong
Northern Telecom (Nortel)
Wireless Development Center, Calgary
norman.wong.0139127@nt.com

----- E X T E R N A L L Y O R I G I N A T E D M E S S A G E -----

Thanks to everyone who responded to my initial question. Here's more
info on what I meant by ground plane discontinuity:

1. The edge of the microstrip ground plane runs parallel to (and =
directly
below) the edge of the first conductor.
_________ _________
________|_______|_______|_______|___________ Conductors
|___________________________________________| Dielectric
|___________________________________| Ground

2. The discontinuity is random (ie. a conductor passing over a =
via/solder
ball well in the ground plane).

3. The discontinuity is regular (ground plane mesh).

4. The ground plane stops at some length short of the end of the =
microstrip
(ie extra long leads/tails).

(I'll deal with voltage disparaties some other day).

It has been my experience that most solvers idealize the ground plane. =
I'm
just doing a reality check based on simplified problems which represent
real situations. Hopefully this may develop into a technical paper.

Frank Yuan: you mentioned several papers which are not yet published, =
but
sound very helpful. Specifically, references 5 (for a different problem =
I'm
working on) & 6 should be very interesting. Is it possible you could Fax =
a
copy to me? I would greatly appreciate it.

Thank you again, to all. And keep that good input flowing! Have a great =

weekend.

____________________________________________________________________
|__________________________________________________________________|
|| || ||
|| Frances G. Hart || e-mail: fghart@mmm.com ||
|| 3M || ||
|| Austin, Texas || Phone: (512)984-6869 ||
||______________________________||__FAX:_____(512)984-5940________||
|__________________________________________________________________|