Re: [SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace

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From: Matt Bibee (mbibee@rocketchips.com)
Date: Fri Mar 02 2001 - 10:36:28 PST


Your tool should give you the per meter RLGC matrices at your desired
frequency. The classic equation is:
alpha=Re{sqrt[(R + jwL)(G +jwC)]} where alpha is in Nepers/m. I forget the
conversion factor. That's the total loss. Is there an advantage to seperating
loss into conductor and dielectric? If you have it available the hspice W
element can accept RLGC params in matrix format and will model skin and
dielectric loss.

"Denomme, Paul S." wrote:

> I am currently working on a job and have a microstrip trace on
> GETEK. The trace width is 33 mils 1/2 oz., running at 1GHz, 75 ohms, Dk of
> 3.9, and Loss tangent of .01. I am trying to calculate the total conductive
> loss and the total dielectric losses for this microstrip case. For
> conductive losses I obtained 0.189dB/M which seems correct to me. I
> obtained this result from Ansoft 2D analyzer. I am also trying to determine
> the dielectric losses for this trace but I am not sure if I can use a
> formula for this calculation or not. The formula for dielectric loss I have
> is
>
> Ad=(27.3*SQR(Er)*LossTangent)/Wavelength
>
> The Ansoft software gave me an effective Dk of 2.88 which is .74 of the
> Dk=3.9. I am thinking that I could use the .74*Losstangent as the effective
> loss tangent and
> plug in the effective dielectric constant and the effective loss tangent
> into the above equation to get the dielectric losses. Can anyone tell me if
> I am way off base on this one? or am I right on the money?
>
> I would appreciate any feedback.
>
> Regards,
>
> Paul S. Denomme
> paul.denomme@viasystems.com
>
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