FreeLists / si-list / [SI-LIST] magnetic permeability in dielectric loss

[jojo <jojosabre@xxxxxxxxx>]

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


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