Jim Kelley wrote:
I can find no support in the literature
for a claim that interference changes the direction of the Poynting
vector - or for that matter, is a cause for any other phenomenon to
occur.

The Melles-Groit web page certainly supports wave cancellation
being the cause of the "lost" reflected energy joining the
forward wave. The Molecular Expressions web page certainly
supports that same energy redistribution resulting from wave
cancellation.

And given the following example from "Fields & Waves ..." by
Ramo & Whinnery, what do you think changes the direction of
the Pz2- Poynting Vector such that it vectorally adds to the
Pz1+ Poynting Vector resulting in the Pz2+ Poynting Vector?

100W XMTR---50 ohm line---+---291.4 ohm line---1698.5 ohm load
Pz1+ = 100W-- Pz2+ = 200W--
--Pz1- = 0W --Pz2- = 100W

If you can answer that simple question to the satisfaction of
everyone, the discussion will be over.
--
73, Cecil http://www.qsl.net/w5dxp


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