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On Dec 24, 10:30*am, Cecil Moore wrote:
Keith Dysart wrote: And could someone who likes to write "standing wave power" (Yuri perhaps?) please provide an unambiguous definition? It does not have to be the "right" definition, or agreed by all, just any definition which is unambiguous. Confusion reigns because of steady-state short cuts. The power density (Poynting vector) of any EM wave is ExH. EM waves cannot exist without a power density. For pure standing waves, ExH = 0. Therefore, a pure standing wave is technically NOT an EM wave. It doesn't move and contains no power. In many ways, it is an illusion. A standing wave is a math model created in the human mind as a useful shortcut. Shortcuts do NOT dictate reality. Reality is supposed to do the dictating. Standing waves are the results of the superposition of two traveling waves. Any power extracted comes from the component traveling waves, not from the standing waves. For pure standing waves: ExH = V*I*cos(A) = 0 watts (per unit area) I am having great difficulty matching the words you wrote with the request for an unambiguous definition of "standing wave power". Are you saying the concept is meaningless? Or do you think you provided a definition? I really wanted a definition from someone who thought the "standing wave power" had meaning. ...Keith |
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