Thanks all for the pointers to the various tools, they were exactly what I was looking for. I had completely forgotten to reinstall AppCAD after my system was migrated to a new OS. If it is of any use for the future reference of others: HP AppCAD http://www.semiconductor.agilent.com/spg/doc/wirelessDesignTools/AppCad/setu pex.exe Applied Wave Research TXLine http://www.appwave.com/products/txline.html They seem to agree fairly well on my geometry, but I needed to reduce the gap width by about 0.1um in the HP tool to get a solution. Best regards, -Brett ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field 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