**From:** Denomme, Paul S. (*Paul.Denomme@viasystems.com*)

**Date:** Thu Mar 01 2001 - 10:22:03 PST

**Next message:**Ron Miller: "RE: [SI-LIST] : Total Conductive and dielectric Losses for a micr ostrip trace"**Previous message:**Farrokh Mottahedin: "Re: [SI-LIST] : APC-7 adapters"**Next in thread:**Matt Bibee: "Re: [SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"**Reply:**Matt Bibee: "Re: [SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"

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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**Next message:**Ron Miller: "RE: [SI-LIST] : Total Conductive and dielectric Losses for a micr ostrip trace"**Previous message:**Farrokh Mottahedin: "Re: [SI-LIST] : APC-7 adapters"**Next in thread:**Matt Bibee: "Re: [SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"**Reply:**Matt Bibee: "Re: [SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"

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