[SI-LIST] Re: coupling calculations

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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