[SI-LIST] Loss Tangent question

The model for a "lossy" (microstrip or stripline) transmission line has 
terms for series resistance (skin effect) and parallel conductance 
(dielectric losses.)  If I have a specification for loss tangent (at a 
particular frequency), is there a straightforward way to get from loss 
tangent to conductance? That is, how do I calculate conductance given a 
loss tangent?

Secondly, if I know the loss tangent at one frequency, can I therefore 
derive it for all other frequencies? Or are there too many variables involved?

Thanks for your input.

Doug Brooks


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