Hello, I'd like to thank everyone that responded to my last message about an 8 db difference in the S-Parameter results from SIWave compared with the lab. In the end, the problem was determined to be the way the connector via was modeled by the software. Ansoft is currently working on a fix. On another topic, has anyone used the EMPIRE software by IMST Microwave and RF Institute? www.empire.de <http://www.empire.de/> I've just taken a look at the features and demonstrations and it seems to be very impressive and comparable to SIWave. It is a time domain solver so it is many times faster than SIWave. Could anyone comment on the software's ease of use, accuracy, PCB layout import capabilities, cost, and the vendor's customer support? Success or failure stories would be very helpful as well. Thank you. Yang You Texas Instruments, Inc. yang.you@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