Roy Lewallen wrote:
In the absence of radiation, all the charge that flows into an inductor
has to flow out, a point I and (much more eloquently) Ian and others
have tried to make, but which is lost on some of the most vocal
contributors to the newsgroup. This concept doesn't seem to fit neatly
into some of the preconceived theories, so is simply being ignored. In
the end, any theory that truly explains observed phenomena has to work
with physically vanishingly small inductors, for which the currents in
and out must be equal, as well as larger ones.

What a lot of people are missing is that a relatively constant forward
current flows into the bottom of the coil and out the top. That current
is reflected from the tip of the antenna and a relatively constant
reflected current flows into the top of the coil and out the bottom.
The current at the bottom and top of the coil is the phasor sum of
those two currents and cannot help but be different for the typical
mobile bugcatcher antenna.

The net total current is the sum of those two currents and even if the
component currents are constant, their phasor sum will differ because
the phase of the component currents are changing in opposite directions
across the bugcatcher coil.

The cosine current distribution on a standing-wave antenna is just a
standing wave caused by the superposition of forward and reflected
current.

For a vanishingly small inductor, the phase shift through the inductor
is near zero and indeed results in the same current on both sides of
the inductor so the theory works just fine.
--
73, Cecil http://www.qsl.net/w5dxp
"The current and voltage distributions on open-ended wire antennas are
similar to the standing wave patterns on open-ended transmission lines ...
Standing wave antennas, such as the dipole, can be analyzed as traveling
wave antennas with waves propagating in opposite directions (forward and
backward) and represented by traveling wave currents If and Ib ..."
_Antenna_Theory_, Balanis, Second Edition, Chapter 10, page 488 & 489


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