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: [email protected]
I have no affiliate with him. Good Luck.
Norman Wong
Northern Telecom (Nortel)
Wireless Development Center, Calgary
[email protected]
----- 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: [email protected] ||
|| 3M || ||
|| Austin, Texas || Phone: (512)984-6869 ||
||______________________________||__FAX:_____(512)984-5940________||
|__________________________________________________________________|