**From:** Ron Miller (*rmiller@brocade.com*)

**Date:** Thu Mar 01 2001 - 10:38:36 PST

**Next message:**John Carrillo: "[SI-LIST] : EUROPEAN IBIS SUMMIT 3/16/01 - THIRD ANNOUNCEMENT"**Previous message:**Denomme, Paul S.: "[SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"

Better to use ADS from HP. It uses the formulas from the

MTT of IEEE that were found to fit the data and were developed over

the last 30 years.

Ron Miller

-----Original Message-----

From: Denomme, Paul S. [mailto:Paul.Denomme@viasystems.com]

Sent: Thursday, March 01, 2001 10:22 AM

To: si-list@silab.eng.sun.com

Subject: [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:**John Carrillo: "[SI-LIST] : EUROPEAN IBIS SUMMIT 3/16/01 - THIRD ANNOUNCEMENT"**Previous message:**Denomme, Paul S.: "[SI-LIST] : Total Conductive and dielectric Losses for a microstrip trace"

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