Neven: You may try these equations; they should meet your requests. Sxy are single-ended s-parameters. SDD11=0.5*(S11-S13-S31+S33) SDD12=0.5*(S12-S14-S32+S34) SDD21=0.5*(S21-S23-S41+S43) SDD22=0.5*(S22-S24-S42+S44) SCD11=0.5*(S11-S13+S31-S33) SCD12=0.5*(S12-S14+S32-S34) SCD21=0.5*(S21-S23+S41-S43) SCD22=0.5*(S22-S24+S42-S44) SDC11=0.5*(S11+S13-S31-S33) SDC11=0.5*(S12+S14-S32-S34) SDC21=0.5*(S21+S23-S41-S43) SDC22=0.5*(S22+S24-S42-S44) SCC11=0.5*(S11+S13+S31+S33) SCC12=0.5*(S12+S14+S32+S34) SCC21=0.5*(S21+S23+S41+S43) SCC22=0.5*(S22+S24+S42+S44) Thanks & Regards, Shi, Wenjun ( Email: wenjun.shi@xxxxxxxxx) SI Engineer -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of npischl Sent: 2004年2月6日 6:24 To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] 2-port VNA -> 4-port VNA ? Does anyone know if there is an available conversion routine (e.g. Excel, Mathad, web-based.....), that would help me convert multiple 2-port VNA S-parameters obtained on a 4-port DUT (measure all combinations of two-ports while the other ports are terminated) and convert them into 4-port mixed-mode S-parameters? I am especially interested in SCC21 and SDC21 (CM-CM transfer and CM- DM conversion). I cannot use TDR/TDT because I need at least -60 dB sensitivity. Thank you, Neven ------------------------------------------------------------------ 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.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 ------------------------------------------------------------------ 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.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