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May 1998

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Subject:
From:
Eddie Brunker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 21 May 1998 16:34:43 +0100
Content-Type:
text/plain
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text/plain (51 lines)
Recently an article appeared in the Electronics Press after the head of
Multek visited Dovertron in Cork (part of the same group of companies), and
good friends of ours too.
The article focused on his warnings that at 300MHZ and above, Fr-4 is
unsuitable and future substrates should be of alternative materials, the
costs and processing should be considered etc...
I asked our design engineers to comment on this, and they have no problems
with FR-4 at 300MHZ which are speeds we use presently. I know of one other
company using FR-4 at these speeds, and if they are happy with it then so am
I, as they are big league!

Regards


At 08:25 21/05/98 -0700, you wrote:
>        Has anybody had any problems with FR-4 at 100 to 200 MHz?  I have
several boards from several fabrication shops in which the signal loses
amplitude above 80-100 MHz.  The boards are controlled impedance (50 Ohms)
with 5 mil traces and 5 mil dielectrics.  The traces are about 6.5" long.
>        I would appreciate any comments on this subject.  The supplier of
the material says that FR-4 should be good to 400 MHz.
>
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