Mick, "Je pense" a 2.5D simulation is a simulation of a planar conductor geometries (X-Y plan) with a planar substrate in the third dimensional space. In a 2.5D sims, the X-Y plan contains the currents AND there is NO current flowing along Z-axe. Sometimes, the current may flow along Z axe, but NOT in the X-Y plan. Example: Vias. In other words, we talk about a "2.5D" simulation methods when there is planar restriction on the current flow. Example: Momentum is 2.5D simulator. Regards, Samir -----Original Message----- From: Zhou, Xingling (Mick) [mailto:xlzhou@xxxxxxxxx] Sent: Tuesday, December 04, 2001 3:36 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] 2.5D Hello, A simple but unclear (to me) question. What is the exact definition of "2.5D problems" ? If we search "2.5 D simulation", we can find some products. Because the problem has been there for a while. Please advice academic references or support instead of "I think". Regards. Mick ------------------------------------------------------------------ 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 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 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