Matthew,

High frequency materials are divided into two groups (when it comes to
cost), one set is for use in military and very high reliability
applications (which means higher cost) while the other group of
materials are those that have been designed with cost as the fist key
property (lower cost but still higher than FR4). The commercial products
from Rogers that have the lower cost and stable properties over
temperature (oscillators require that to keep your frequency from
drifting) are the RO4000 materials (thermoset/ceramic filled resin on
woven glass). What exactly were the manufacturing concerns from the
printed circuit board fabricators and how does going to a high frequency
material solve them (if electricals were not a problem)?

Art Aguayo, Technical Support Manager
[log in to unmask]
602 961-8271



Matthew Park wrote:
>
> I have a customer that designed and tested a 5Ghz oscillator
> using 0.031" thick FR4-difunctional substrate.  The board is a
> simple design with 120 smt comp's and some th.  The customer
> tested proto-type units and they works good.  Obviously all of its
> other  boards are designed using FR4-difuntioinal.
> I don't think any board contract mfg want to take this job when I
> see the board layout (it is not designed for manufacturability).
>
> My question to you is "What board material is suitable for
> 5Ghz without  eating up too much cost?  I looked into Rogers's
> material but don't think the customer want to pay  10 times more.
>
> regards
> Matthew
> NII-Norsat International Inc.
>
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