Hello, I have a basic question in terms of accounting for the complex components of dielectric loss (material) as it relates to pcb or pkg substrates. To keep it as simple as possible, it seems that most diamagnetic materials usually have a dielectric permeability constant of 1 or less. Is it safe to assume a dielectic permeability constant of 1 or should this value be set accordingly (if data is available) to accurately compensate and predict the use of this component for dielectric losses? Also, has anyone done any investigations in deferring the use of this parameter and just using loss tangent and relative dielectric permittivity information? Thank you for your insight. jo --------------------------------- Do you Yahoo!? The New Yahoo! Shopping - with improved product search ------------------------------------------------------------------ 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