Hello Kaikun, Have you tried AddCAD from Avago technologies (formely Agilent semiconductor) ? It has some tools to calculate microstrip and stripline Here is the link: http://www.avagotech.com/pc/downloadDocument.do?id=3D4219 Regards, Luc Durand -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Haikun Zhu Sent: Thursday, March 02, 2006 9:21 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] characteristic impedance for embedded differential microstrip line Hi folks, Can anyone point me to good resources for calculating the characteristic impedance of embedded, edge coupled differential microstrip line? ADS linecalc has typical differential microstrip lines but they're not embedded. I also found UCCALC from ultracad but it's not free. I'm now trying to do it in Momentum. But if there is readily available resources i'd be happy to know. Thanks a lot, Haikun -- For every difficult problem there is always a simple answer and most of them are wrong. -- Clayton R. Paul ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu