Jim Kelley wrote:


Cecil Moore wrote:
... I have gone on record as saying that
reflections only occur at physical impedance discontinuities.

You have also gone on record as saying is this:

4/19/07 6:12 AM
"The only thing s11(a1) and s12(a2) encounter are each other and that
interaction completely changes those two waves. The two waves cancel
and their energy components are re-distributed in the opposite
direction. s11(a1) and s12(a2) never encounter an impedance
discontinuity."

There's no conflict between those two statements. s11(a1) and
s12(a2) indeed *NEVER* encounter an impedance discontinuity
since they originate already flowing *away from* the impedance
discontinuity. Any interference between two coherent collinear
EM waves traveling in the same path is a permanent interaction.
--
73, Cecil, w5dxp.com