[SI-LIST] Re: Loss Tangent question

Doug, yes, you can solve this as a phase plane problem:

The loss tangent expresses the ratio of the conductance to the reciprocal 
capacitive reactance at the test frequency.

Loss tangent is frequency dependent, but changes slowly.  So, DC to 
daylight is out.  You will want the loss tangent for the frequency range of 
interest.

Steve.

At 12:05 PM 3/26/2005 -0800, Doug Brooks wrote:
>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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