John,
lesson learn or FA are hard to come by - legal issues.  design guidelines
for radar or others are more easily obtained (not sure what you are
looking for in terms of GHz)- especially within the program.  however, if
you are in the need to know basis (such as Harris), you might have to jump
over few huddles to get it.  GIDEP might have what you are looking for
(you might need to find out who is rep in your company to get access).
http://www.gidep.org/
Best of luck.
       jk
i think few chief in your neck of the woods may be retired a bit too early
;-)
> Good Morning TechNet!
>
> This topic and concern came up in regards to GHz signal routing, but I
> have not found any references in published literature.  If there are
> combinations of PCB materials, via dimensions, design parameters, assembly
> processes and environmental usage conditions that can manifest a
> reliability concern I'd like to understand these issues and failure
> mechanisms, but I don't want to chase these ghosts and over constrain
> ourselves if none have been seen...................
>
> Perhaps this was a problem once upon a time and has been overcome by
> ongoing technical progress and process improvements?
>
> Thanks for any insights, technical references, history lessons or relevant
> experience you may be able to share with us.
>
> Regards,
>
> John
>
>
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