FreeLists / si-list / [SI-LIST] Re: Dielectric Constant - thin materials - DC to 10GHz

["Scott McMorrow" <scott@xxxxxxxxxxxxx>]

Farah,

We've designed fixtures and made Er and tanDelta measurements of thin 
polymide flex materials in our lab with extremely good results.  We will 
be presenting our techniques in a TecForum at DesignCon this year 
titled: "Advances in Design, Modeling, Simulation and Measurement 
Validation of High Performance Board-to-Board 5-to10 Gbps Interconnects."

best regards,

scott

Haddadin, Farah wrote:

>Hello everyone,
>
>I am looking for a fixture that is capable of measuring permittivity of
>thin materials from DC - 10GHz.  There are two issues here:
>
>1)  The wide band of frequency:  do I have to create two fixtures: one
>for low frequency and one for high?
>2)  The thickness of the material to be tested:  I was told that the
>thickness of the material should roughly be: 20/sqrt(Er) [mm].  For
>example, for a permittivity of 4, the thickness of the material under
>test should be 10 mm.  This is a conservative thickness estimator, but
>the thickness of the materials of my interest is  0.1mm - 1mm.
>
>I would greatly appreciate it if someone can point me to an existing
>fixture or methodology to test such thin materials for the frequency
>range mentioned above.  Also, is there any reading material on the web
>on how to create fixtures?
>
>Thank you,
>Farah
>
>
>
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-- 
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com




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