[SI-LIST] Question on Rogers4350 loss
- From: <jose_moreira@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 8 Apr 2005 18:00:14 +0200
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
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
