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

Dima Smolyansky (dima@tdasystems.com)
Thu, 15 Jul 1999 17:44:23 -0700

Guys:

Actually, there is a very simple way of modeling two coupled lines - using
the measurement of an even and odd mode impedances and delays for these
lines. 2 coupled lines can be modeled as 4 uncoupled lines, n coupled lines
can be modeled as 2n uncoupled lines. Any simulator will support that. A
simplified model can be used as well, where only one line is responsible for
coupling - but that, of course, does not take into account the difference
between the even and odd mode velocities.

Thanks,

-Dima
=================
Dima Smolyansky
Product Marketing and Applications Engineer
Time Domain Analysis Systems, Inc.
7465 SW Elmwood St.
Portland, OR 97223
(503) 977-3629
(503) 804-7171 (mobile)
(503) 245-5684 (fax)
www.tdasystems.com
The Interconnect Modeling Company (TM)

-----Original Message-----
From: jaydiep@us.ibm.com <jaydiep@us.ibm.com>
To: si-list@silab.eng.sun.com <si-list@silab.eng.sun.com>
Date: Thursday, July 15, 1999 3:07 PM
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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