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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 |
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