[SI-LIST] Re: Even/Odd mode general case

  • From: "Beal, Weston" <Weston_Beal@xxxxxxxxxx>
  • To: Doug Brooks <dbrooks9@xxxxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 9 Feb 2012 17:48:42 +0000

I consider the modes of a coupled transmission line system to be more basic 
than the current or voltage. The modes are calculated from the geometry to know 
how the different combinations of signals on the transmission lines can 
propagate or be attenuated. The modes are calculated by eigenvectors of the 
inductance and capacitance matrices of the coupled transmission line system. 
Therefore, there are as many modes as there are transmission lines in the 
coupled region. There is no defined terminology that I know of for the modes in 
a coupled region with more than 2 signal conductors (plus reference). The 
designation of the modes must be defined for each case in order to make clear 
the presentation of that case.

Now, Steve can correct me as needed :)X

Regards,
Weston


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Doug Brooks
Sent: Wednesday, February 08, 2012 6:42 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Even/Odd mode general case

Even mode and odd mode describe the types of current that can occur on a PAIR 
of (differential) traces. What is the more general description if there are 
more than two traces coupled together? How many modes can exist in a general 
case, and how do we denote them?

Thanks


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