Richard Harrison wrote:

Cecil, W5DXP wrote:
"What phenomenon of physics causes the energy and momentum in that wave
to reverse direction?"

So, to opens and shorts, equal and opposite radiation fields can be
added to the list of things which cancel energy traveling in a certain
direction.

Thanks Richard, that's what I have been trying to say. And the
"equal and opposite radiation fields" can occur inside a
transmission line at an impedance discontinuity. After all, an
RF transmission line signal is just EM wave-fields contained
by a boundary.

Walter Maxwell said such in "Reflections II", page 23-9:
"With equal magnitudes and opposite phase at the same point
(Point A, the matching point), the sum of the two waves is
zero."

When two waves sum to zero, their energy components must be
redistributed. In a transmission line, if energy ceases flowing
in one direction, it must change directions. That's a reflection.

So here's a list of things that can cause 100% re-reflection of
reflected energy in a transmission line. 1. short-circuit,
2. open-circuit, 3. pure reactance, 4. permanent wave cancellation
at an impedance discontinuity.
--
73, Cecil http://www.qsl.net/w5dxp


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