Because COMSOL was mentioned I feel that I should comment that CST has an inexpensive static thermal solver. I have used it in conjunction for DC current versus temperature rise analysis of power connectors as well as a few RF power applications ... terminations, attenuators, etc. Once you have empirical data such as contact resistance in the case of DC current it is intuitive and runs fast. 3D thermal results are graphically dramatic and identifies the the locations with the highest temperatures. The thought of pulling in an entire power plane is a little bewildering tho, but CST has bought up some other solver solutions that are not within my "current" interests. I used to use PCB Studio prior to CST's purchase and wonder if integration may have added thermal co-simulation. Hmmm ... .. My only affiliation with CST is as a customer. For what it is worth, I am certain that similar software solutions lie within Ansys having been an equally intense user of HFSS & other Ansys products over the years. -- Jeffrey L Walden EMC/SI RF analysis and product development jwalden@xxxxxxxx (866)547-5365 ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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