Hi, Just another paper which maybe of interest: G. Antonini, "S-Parameters Characterisation of Through, Blind and Buried via holes", IEEE Transactions on Mobile Computing, Vol. 2, No.2 April-June 2003 This paper discusses a de-embedding technique partitioning the test structures between the via and mircostrip traces which provide a run in to the vias. This paper also provides dimensions and stack-up information of the test structures evaluated, which maybe a good starting point for some 3D simulations. Regards, Eoin emcgibney@xxxxxx ------------------------------------------------------------------ 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