John Popelish wrote:
the net charge movement is zero and therefore
the standing wave current is not "going" anywhere?
Sorry, no.
Gene just posted the equation for standing wave current.
Isw = 2Io cos (kz) cos (wt)
This is definitely not in the form of a traveling wave.
Hecht, in "Optics" says the standing wave does not move
through space. Presumably, for the same reason, a
standing wave does not move through a wire.
Looking
just at just current, and at only a single point, a traveling current
wave and a standing current wave are indistinguishable.
True but if you know the equation above, then they are distinguishable.
The only way to understand a standing wave having a phase of zero
degrees, that makes sense to me, is that it applies to all points
between one current node and the next.
Yes, the subject in context is 1/4WL monopoles or 1/2WL dipoles.
That's unclear to me. Why can't the E-field and H-field simply be
exchanging energy at a point rather than any net charge moving
laterally?
In an isolated EM plane wave, I think this is the case, and displacement
charge in space takes the place of conductor current. But when a wave is
guided by a conductor, we can measure the charge sloshing back and forth
in the conductor in response to those fields.
Yes, I was confused about that. If the question is changed to: "Why
can't the E-field and H-field simply be exchanging energy within each
1/4WL rather than any net charge moving out of that 1/4WL?", it would
make sense.
Thanks John, for the refresher course.
--
73, Cecil
http://www.qsl.net/w5dxp