Denny,

HP has come out with a Dielectric Materials Analyzer (HP4291 with assorted
stuff) which will test Dk and Df between 1MHz and 1.8GHz without the hassles
of stripline or sheet resonance.  It is a pricey unit, but it will
automatically sweep the frequency range and directly plot Dk & Df in a
matter of a couple of minutes with no more than a small (1"x1") piece of
unclad material.  We recently evaluated and purchased this Dielectric
Materials Analyzer, and provide testing as a service.

It must be noted that this is no substitution for information needed for
applications at higher frequencies (>2Ghz) available only with current
methods (Stripline and resonance), but can suffice for many of the current
High Speed Applications in the 700Mhz to 2Ghz range.

Bob Neves
Director of Technical Services
MICROTEK LABORATORIES
(800) 878-6601
[log in to unmask]
http://www.TheTestLab.com

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