**From:** WAUGH,RAY (A-SanJose,ex1) (*ray_waugh@agilent.com*)

**Date:** Thu Mar 01 2001 - 15:31:38 PST

**Next message:**Mark Apton: "[SI-LIST] : S. I. Position @ nVidia, multiple locations;"**Previous message:**Dima Smolyansky: "Re: [SI-LIST] : Interconnects"

You can use Martin Schneider's equation to compute dielectric losses (see

attached file, taken from my 1999 seminar).

I think your value of tan delta (0.010) is a bit optimistic. In many cases,

manufacturer's data are optimistic, or taken at 1 MHz (where you are not).

Ray

---------------------------------------------------

Raymond W. Waugh - WSD Applications

E-mail: ray_waugh@agilent.com

Wireless Semiconductor Division

39201 Cherry Street, MS NK20

Newark, California 94560

------------------------------------------------------

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

From: Denomme, Paul S. <Paul.Denomme@viasystems.com>

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

Date: Thursday, March 01, 2001 10:34 AM

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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