Richard,
Thank you very much for your feedback.
I´m affraid I´m not subscribed to Desiners Forum.
Could pls send to me its url to subscribe to the server list?
Again, thanks a lot.
brgds,Ricardo
>>> "Stadem, Richard D." <[log in to unmask]> 05/09/2017 10:50
>>>
Hi, Ricardo
I do not have the capability to post your picture, but I am sure Steve
can, and I see you have copied him.
Being that many people are taking vacations here this week as part of
Labor Day weekend, not sure when Steve will be in. You may need to wait
until later today.
In looking at the stack-up, I do not have a lot of expertise in this
area, but I do know that having differing layer thickness can maybe
cause some issues with different coefficients of thermal expansion
during reflow and other heat excursions. This can put stresses on the
vias passing all the way through the board. But I am not an expert in
those issues. One suggestion; you would be wise to also pose the
question to the Designers Forum. I am sure they can give you plenty of
advice on that.
Richard
 
From: Ricardo Moncaglieri [mailto:[log in to unmask]]
Sent: Tuesday, September 05, 2017 8:34 AM
To: Stadem, Richard D.; Steve Gregory
Subject: Re: Multilayer PCB of Different Substrat Thickness RF Design
 
Steve, Richard,
Would you pls upload  the herebelow quoted image inord to be more clear
on my quetion to the forum?
Indeed hope to receive your comments / advise.
Keep awaiting.
Thank you very much, brgds,Ricardo
 
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Estimated colleagues,
Nice to get in contact again with all of you after a bit long time.
We are deploying a RF design and by first time we intend to use a
multilayer pcb with different substrat thickness as shows the stack-up
herebelow detailed.
Questions here are:
As per your experience, is it recomendable such a kind of substrat
design?
Some pcb provider reported it is very difficult to achieve. Can you
recommend or share your background about pcb provider who can assure
high reliability on this pcb provision?
Keep awaiting for your unvaluable feedback.
brgds, Ricardo
Ricardo Moncaglieri
QA Electronic Service Manager
INVAP SE
www.invap.com.ar