On Jan 11, 5:03 pm, Keith Dysart wrote:
I suggest that since the current at the middle of the line
is always 0, the power is always 0 and therefore no energy
crosses the middle. While tracking mixed energy is difficult,
when no energy crosses a boundary it seems easy to keep the
energy on each side of the boundary separate.

Of course, what you say is only true for net energy. If we have a
forward Poynting vector of 100 watts and a reflected Poynting vector
of 100 watts, no net energy is flowing at any point.
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73, Cecil, w5dxp.com