Jim Kelley wrote:
Correct, except for the part about destructive interference
redistributing reflected energy. Please note the absence of any such
claim in the cited (or any other) reference.

Please note the presence of constructive interference in
the cited reference: "... the photons are redistributed to
regions that permit constructive interference ...", which
implies an equal magnitude of destructive interference
elsewhere in order to avoid violating the conservation of
energy principle. It is akin to the gain of an antenna.
Constructive interference in one direction is matched
by an equal magnitude of destructive interference in
another direction.

More to the point, the Z-match reflects energy back toward the antenna.

Yes, as "constructive interference" energy which requires
destructive interference elsewhere to balance the
energy equation. Since there are only two directions
available in a transmission line, any constructive
interference toward the load must be balanced by an
equal magnitude of destructive interference toward the
source.

Quoting Reflections II, by Walter Maxwell, page 4-3:
"The destructive wave interference between these two
complementary waves causes a complete cancellation of
energy flow in the direction toward the generator.
Conversely, the constructive wave interference produces
an energy maximum in the direction toward the load,
resulting from the sum of the two reflected waves
and the source wave."

For a non-reflective thin film coating, these two
reflected waves are known as the internal reflection
and the external reflection.
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:
Jim Kelley wrote:

Correct, except for the part about destructive interference
redistributing reflected energy. Please note the absence of any such
claim in the cited (or any other) reference.


Please note the presence of constructive interference in
the cited reference: "... the photons are redistributed to
regions that permit constructive interference ...", which
implies an equal magnitude of destructive interference
elsewhere in order to avoid violating the conservation of
energy principle. It is akin to the gain of an antenna.
Constructive interference in one direction is matched
by an equal magnitude of destructive interference in
another direction.

More to the point, the Z-match reflects energy back toward the antenna.


Yes, as "constructive interference" energy which requires
destructive interference elsewhere to balance the
energy equation. Since there are only two directions
available in a transmission line, any constructive
interference toward the load must be balanced by an
equal magnitude of destructive interference toward the
source.

Quoting Reflections II, by Walter Maxwell, page 4-3:
"The destructive wave interference between these two
complementary waves causes a complete cancellation of
energy flow in the direction toward the generator.
Conversely, the constructive wave interference produces
an energy maximum in the direction toward the load,
resulting from the sum of the two reflected waves
and the source wave."

For a non-reflective thin film coating, these two
reflected waves are known as the internal reflection
and the external reflection.

Physical objects redistribute energy. Interference simply describes
its spacial distribution.

73, ac6xg

Jim Kelley wrote:
Physical objects redistribute energy.

If you consider a Z01 to Z02 impedance discontinuity
to be a "physical object" then I agree.

Interference simply describes its spacial distribution.

Interference, the noun event, is somewhere in the chain
of *events* between the reflections caused by the impedance
discontinuity and the spacial (re)distribution of energy.
Interference, the noun event, is a subset of superposition,
i.e. not all superposition results in interference.

Interference, the adjective, as in the "interference pattern",
describes the results of interference, the noun event. The
interference pattern describes the spacial distribution.

Maybe your answer to the following question will shed
some light on what you think is our disagreement.

In the RF fields in free space surrounding a dipole,
exactly where are the physical objects that redistribute
the energy? As I understand it, each segment is considered
to be a unit radiator and the radiation interference pattern
is the calculated result of the interference events in free
space in the far field.
--
73, Cecil http://www.w5dxp.com