I'm not sure if that's meant to be humorous, or if you really did
misinterpret what I meant. In case it's the latter, I'll amplify.

If a quarter wavelength shorted stub at frequency f1 has impedance R1,
then a quarter wavelength shorted stub at frequency f2 will have an
impedance of R1 * sqrt(f2 / f1), if it's made of the same type of
transmission line, and the frequency is in the range where conductor
loss dominates (below about 1 - 10 GHz for typical coax).

Roy Lewallen, W7EL

W5DXP wrote:
Roy Lewallen wrote:

All else being equal, the impedance gets higher as frequency increases.


Double the frequency and you have a shorted 1/2WL stub. Isn't the
impedance of a shorted 1/2WL stub lower than the impedance of a
shorted 1/4WL stub?

Roy Lewallen wrote:
I'm not sure if that's meant to be humorous, or if you really did
misinterpret what I meant. In case it's the latter, I'll amplify.

Whoops, I really did misinterpret what you meant. When you said, "All
else being equal," I inferred that you were including the physical
length of the stub. Changing the length of the stub didn't seem to
match the condition, "All else being equal,". Sorry.
--
73, Cecil http://www.qsl.net/w5dxp



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