[SI-LIST] : attenuation calculations

Craig Callen ([email protected])
Thu, 23 Apr 1998 18:11:52 +0100


I am currently investigating attenuation of pcb traces, at speeds of
~1-3GHz, with the use
of GETEK and FR4. The traces are 1/2oz copper, 6mil width, 50 Ohm
impedance. Unfortunately
the only calculations I can find are low-loss approximations. With
these formulas
I am finding the attenuation due to dielectric loss being 0.1db/in and
attenuation due to metal being 0.15db/in, for FR4. These attenuations
were calculated
with the FR4 tangent loss of .018 and AC Resistance approximated at 1
Ohm per in.
I was wondering if anyone out there has accurate formulas for
attenuation and do my
calculations seem reasonable.


Craig Callen
[email protected]