Ravinder,
I am a fan of the Isola FR408 for hi-speed designs.

http://www.isola-group.com/products/fr408/

This is what we used at Adaptec for all our hi-speed boards.

That being said, I recently designed a 10GBit PCB that my customer uses
standard 170C tg FR-4 and it works fine.
Not my call on the substrate but it does work...
Ken

_____________________________________
Kenneth J. Wood
Saturn PCB Design, Inc.              
[log in to unmask]
www.saturnpcb.com





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, July 19, 2012 9:11 PM
To: [log in to unmask]
Subject: [TN] Low Loss PCB Material

Hi All,

We discussed with our quick-turn fab the use of low-loss PCB materials for
high-speed applications.  As per the discussions,the only such material that
is Halogen-Free and has UL Approval seems to be Rogers Theta material.  If
there are other materials available in US and more importantly at the
high-volume fabs off-shore then please share the information.  I will really
appreciate it.

Thanks.


Regards
Ravinder Ajmani
HGST, a Western Digital company
[log in to unmask]
 

5601 Great Oaks Pkwy. 
San Jose, CA 95119-1003
www.hgst.com


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