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May 1998

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TechNet <[log in to unmask]>
Subject:
Frequency problems with FR-4
From:
Fred Watt <[log in to unmask]>
Date:
Thu, 21 May 1998 08:25:09 -0700
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"TechNet E-Mail Forum." <[log in to unmask]>, Fred Watt <[log in to unmask]>
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        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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