Hi guys Thanks for your kindly replay! I will try to convert them in matlab then do calculation for the Zc. Once I got the Zc I wll verify it in transient simulatin to check its reflection. I will back to report my results on this flow. thanks again. Tony 2012/12/4 Zhang Tony <tonywai34@xxxxxxxxx>: > Hi > If I got a s-parameter file, how can I calculate its characteric > impedance at some frequency range? > is there any tools can help on this? > thanks > tony ------------------------------------------------------------------ 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