When does a Quasi Static 3D simulation tool become obsolete? B. Young's book describle the limitation by maximum circuit dimension d < wavelength/10 or d < wavelength/30. With wavelength of interest being calulated from the standard digital frequency of interst equation f = .35/Tr, and the maximum circuit dimension or effective electrical length to be, SQRT(Er)*Mechanical Length, Is this a correct approximation? Why the large range of wavelength ratios? Are there tell tale signs that the Quasi Static assumption has broken down? Thanks, Merrick ------------------------------------------------------------------ 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: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: http://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