Hi, Experts A very basic question. The text book say there is TEM mode only between some frequency(beform other modes are excited) in coaxial line. But if we look inside the inner conductor of coaxial line, there is E field at the direction of wave propagating that make the current flow? Can we still say this is TEM mode in coaxial line? Thanks. Regards ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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