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

Alok Tripathi (alok@ece.orst.edu)
Tue, 20 Jul 1999 09:17:02 -0700 (PDT)

Hello,

Asymmetric coupled lines (n lines) in an inhomogeneous media can be
simulated by n^2(n+1)/2 single lines connected in configuration oriented
fashion. Likewise, n asymmteric coupled lines in a homogeneous media can
be
simulated on spice using n(n+1)/2 lines.

(For details refer: MTT Trans. 1998, Dec. issue: A configuration
Oriented Spice Model...., Alok Tripathi & V. K. Tripathi)

Regards,

ALOK TRIPATHI

On Thu, 15 Jul 1999, Dima Smolyansky wrote:

> 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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