[SI-LIST] Re: coupling calculations
- From: olaney@xxxxxxxx
- To: han.guobing@xxxxxxxxx
- Date: Tue, 3 Nov 2009 12:12:12 -0800
The real problem here is that the most general case was asked for. If
there are symmetry conditions that can be imposed, the situation becomes
much simpler.
Orin Laney
On Tue, 3 Nov 2009 14:04:22 +0800 "Han, Guobing" <han.guobing@xxxxxxxxx>
writes:
> Hi Craig,
>
> I have a idea. First, deriative the solution for two conductor
> based on conformal mapping . Then, try to solve the four conductor
> problem based on array theroy, that is, from [Z]4*4 to [Z]8*8.
>
> How do you think of it?
>
> Best wishes and good luck!
>
> Thanks,
> Guobing
>
>
>
> 2009/10/20, colin_warwick@xxxxxxxxxxx <colin_warwick@xxxxxxxxxxx>:
> > Hi Craig,
> >
> > Sorry I don't have an answer, but I do have a question: Is your
> heart set on
> > an analytical expression, or would you settle for scripting a 2D
> field
> > solver to give you plots of coupling versus geometry?
> >
> > -- Colin Warwick
> > Signal Integrity Product Marketing Manager, Agilent EEsof EDA
> > Blog: http://signal-integrity.tm.agilent.com
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> > Behalf Of Deibele, Craig Edmond
> > Sent: Tuesday, October 20, 2009 9:27 AM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] coupling calculations
> >
> > hi everyone,
> > I have a scenario where I have four conductors enclosed inside of
> a tube and
> > they are used as a coupled transmission line. I know what the
> characteristic
> > impedance is of the sum mode, the two dipole modes, and of the
> quadripole
> > mode.
> >
> > I've seen the equations for two coupled conductors (like for edge
> coupled
> > microstrip/stripline or for broadside coupled transmission lines)
> and for
> > the coupling (i.e. C *log( (Ze-Zo)/(Ze+Zo) )
> >
> > I've gone through some of the math to extend the theory for 4
> coupled
> > conductor transmission lines. I'd have expected that this be done
> already,
> > but haven't found any references.
> >
> > Any ideas or can anyone point me at a good reference?
> >
> > Thanks
> >
> > Craig deibele
> >
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