On 9/12/2015 3:10 PM, gareth wrote:
"rickman" wrote in message
...

My point is that the current is not relevant in the theoretical case. The
ohmic losses you are talking about have to do with the construction of the
antenna, not the geometry. Make an antenna from a super conductor with no
ohmic losses and you will see the same power radiate from both a short or
a long antenna given the same power input to the antenna.

No you won't, for not only will your feeder be matched to your antenna, but
the antenna will be matched to the feeder, and the stored energy that is not
radiated because
of the shorted antenna will go back down the feeder.

Uh, if they are matched, there won't be any reflection energy. It all
gets radiated. You keep getting hung up on the specifics of an
installation when you appear to be asking a question about theory. Yes,
short antenna are not used in practice because they are hard to match to
a feedline and transmitter. But your original question as posited was
about the inherent differences in radiated power given an amount of
power input to the antenna. Quit mixing the theory and the practice or
clearly state which one you are talking about.

Here, this question you asked originally...

What is the nature of free space such that it requires antennae to be at
least 1/4 wave
before accepting radiation efficiently?

Nothing here says anything about the ohmic resistance of the antenna or
the impedance of the feedline. You seem to be asking about how the
power leaves the antenna and radiates as an EM wave.

--

Rick