Technet,

Preparing for a three Gigahertz application, our bright RF 
Engineer tried to determine the losses for FR-4, GETEK, and
Rogers R4003 in 8 mil dielectrics.

He reviewed datasheets and some recent measurements.  He made the
following estimates, which he labled as a "criminally liberal
interpretation" of data he had on hand.  (Meaning he expects the
numbers to be wrong.  Do not try to use these numbers at home,
kids!)

Stripline,  8 mil dielectrics, 3 GHz:

   FR4 loss ~ 1.000 dB/inch 
 GETEK loss ~ 0.750 dB/inch   
RO4003 loss ~ 0.250 dB/inch   

Does any one have better data on these materials, or other
materials at 3 GHz?

Without suggesting ceramic-filled PTFE ($$$), are there lower
loss materials out there?

-- 
George Franck
Principal Product Engineer
Raytheon E-Systems
Falls Church Va

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