Greetings, I am trying to better understand the relationship and impact of complex components of dielectric loss (material) calculations as it relates to pcb and/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 (default) or should this value be accounted for (if data is available) to accurately compensate and predict its impact on 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 for computing R, G and so on.? 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