You'll need to convert the S-parameter matrix into an ABCD-Matrix first. Then you can split up the latter (take the "square root") and convert the result back into S-parameters. The reason is that S-parameters implicitly assume that all your ports are terminated to 50 Ohms (or whatever your reference impedance is), and that is not necessarily true for the center of your cable where you want to do the virtual split. Wolfgang "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx> Sent by: si-list-bounce@xxxxxxxxxxxxx 11/10/2009 10:04 AM To <si-list@xxxxxxxxxxxxx> cc Subject [SI-LIST] S-parameter Bisection Is it possible to split a passive S-parameter matrix into two equal sections? For example; given s-parameters for a transmission line of a 10" length can the matrix be split into two 5" lengths. Assume that the passive s-parameter obeys reciprocity. The reason I'm asking is that I have a test fixture on each end of my measurement that I'm trying to de-embed. The insertion loss can be subtracted very easily, but the return loss and other parameters have a great deal of error dealing with de-embedding from one side of the DUT only. I'm hoping to break the fixture into two equal parts without having a direct point of measurement to do so otherwise. Merrick M. Moeller The information contained in this electronic mail message is privileged and confidential information, may be subject to the attorney-client privilege and is intended solely for the use of the addressee. If you are not the intended recipient, any disclosure, copying, distribution, or the taking of any action in reliance on the contents of this message is strictly prohibited. If you have received this message in error, please notify me immediately. ------------------------------------------------------------------ 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