check pcb007 website for signal integrity book. Best of luck. jk On Sep 4, 2017, at 10:18 AM, Ricardo Moncaglieri wrote: > 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