Good Morning,
I'd like to poll how some of you specify board material on your Fab 
drawings, so that you get the same material from any vendor.  I know FR4 
has many flavors, and some are more available than others.  I need an FR4 
material with a low dielectric constant, that can remain relatively stable 
over temp, humidity and frequency changes.  I'm working with RF circuits, 
but not extremely high frequencies, and need to keep cost down as low as 
possible.  Suggestions?
Appreciate your help.
Thank You,
Kitty


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