RE: [SI-LIST] : even-odd mode influence

WAUGH,RAY (ray_waugh@am.exch.hp.com)
Thu, 15 Jul 1999 16:47:27 -0600

Guys...

Field solver software??? I'd be careful about going down that road to
answer a relatively simple question. Such software is very expensive and
takes a great deal of understanding (of e-m theory) to use. I am a
RF/microwave circuit designer with an electromagnetic theory background, and
I know of very few of my kind who can use such a tool effectively.

As Adrian Shiner put it so accurately, "...you get both in some proportion
no matter how you think you have designed in one mode."

Ray Waugh

_/ Raymond W. Waugh - WSD Diode Applications
_/ E-mail: ray_waugh@hp.com
_/_/_/ _/_/_/
_/ _/ _/ _/ USPS : Wireless Semiconductor Division
_/ _/ _/_/_/ 39201 Cherry Street, MS NK20
_/ Newark, California 94560
_/

-----Original Message-----
From: jaydiep@us.ibm.com [mailto:jaydiep@us.ibm.com]
Sent: Thursday, July 15, 1999 1:49 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : even-odd mode influence

Weber,

To be able to simulate even-odd mode effects, you'll have to model the
conductors as a system of coupled transmission lines. There are not many
simulators that can do it, and even the ones that can are pretty limited to
the
number of conductors they can handle. Many of them can only handle lumped
models, where what you really need to see what's going on is a true
distributed
model. You'll need a field solver to extract the coupled transmission line
matrices - it's not easily done analytically. Take a look at Ansoft,
Applied
Simulation Technology, and Pacific Numerix. HSPICE can model coupled lines
using geometric input (conductor size, spacing, etc.), but I can't vouch for
its
accuracy.

Jay Diepenbrock

Senior Engineer
Interconnect Technology & Qualification
IBM Global Procurement, B8UA/061, RTP, NC
Phone: 919-543-8804 Fax: 919-543-3642
Email: jaydiep@us.ibm.com

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