[SI-LIST] Re: Question on Rogers4350 loss
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: <jose_moreira@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 8 Apr 2005 10:22:10 -0700
Jose
Do you have any solder mask on the board? If so it will contribute to the
measure losses.
Tom Dagostino
Teraspeed Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
http://www.teraspeed.com
tom@xxxxxxxxxxxxx
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
Teraspeed is the registered service mark of
Teraspeed Consulting Group LLC
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of
jose_moreira@xxxxxxxxxxx
Sent: Friday, April 08, 2005 9:00 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Question on Rogers4350 loss
Hi
I would like to raise a question regarding to the dissipation factor =
(tan d) of Rogers4350.
My question is related to the problem posted by Ming Tsai some time ago =
on the difference between measured and simulated loss of a microstrip in =
Rogers.
In my case I have microstrip with 21mil width and 10.2 inch length. When =
I simulate the trace with the Rogers4350 specd value (~0.0037 at 10Ghz) =
I get a insertion loss that is much higher that the measured values. On =
my simulation I include a surface roughness factor of 1 micro-meter =
which I would say is Ok. I also add the maximum guaranteed insertion =
loss of the connectors. The connectors on my board are 2.4mm and I use =
and optimized footprint obtained thorough 3D simulation by the connector =
manufacturer.=20
When looking for an answer to this problem I came across a presentation =
from Chad Morgan from AMP where there is a slide with the measured =
dissipation factor for several dielectrics and I see that for Rogers =
they were measuring around 0.008!!.
When I use this new value on my simulations I start to get some =
reasonable correlation between simulation and reality.
Has anyone looked into the real dissipation values for Rogers4350 and =
other dielectrics (e.g. Rogers4003C) that you get on real boards??
Best Regards
Jose Moreira
_____________________________________________________
Jose Moreira
Application Consultant
STS Center of Expertise
Agilent Technologies R&D and Marketing GmbH & Co.KG
Herrenberger Strasse 130
CCST-BUS
D-71034 Boeblingen
Germany
Email: jose_moreira@xxxxxxxxxxx
______________________________________________________
=20
=20
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