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 Check out our resources at http://www.ultracad.com ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu