Richard Clark wrote:
Cecil Moore wrote:
All of the photon energy present in
these waves must somehow be recovered or redistributed in a
new direction, according to the law of energy conservation

New heights of sheer stupidity. This sounds like bingo night in the
church basement where no one actually loses any money, it just gets
shuffled around.

One more example of an ignorant person making fun of
things he doesn't understand. The principle of the
conservation of energy indeed states that energy is
not gained or lost - it just gets shuffled around.
When EM wave cancellation occurs, the energy remains
in EM wave form and simply gets redistributed.

As we tune our antenna tuners while watching the
reflected power indication, we are varying the
magnitude and phase of the two component reflected
waves at the tuner input. When those two component
waves are adjusted to equal magnitudes and opposite
phase, reflections toward the source are obviously
canceled since they can be measured as going to zero
in the direction of the source. The following S-Parameter
equation describes the final outcome toward the source.

b1 = s11(a1) + s12(a2) = 0, total destructive interference

Since energy cannot be destroyed by an antenna tuner
and since there are only two directions available, in
a lossless system, the energy in waves canceled toward
the source must be redistributed (re-reflected) to waves
traveling toward the load as constructive interference.
That's the other S-Parameter equation.

b2 = s21(a1) + s22(a2) = Vfor/SQRT(Z0)

Square those equations and you get the power equations.
|b1|^2 = net reflected power = 0
|b2|^2 = net forward power = all the available power
--
73, Cecil http://www.w5dxp.com