Jim Kelley wrote:
Cecil Moore wrote:
Since, in my example, glare has been completely
eliminated, you are asking: "What is the wavelength
of nothing?"
But in order to conserve energy, wouldn't the glare have to re-reflect
off of an interference pattern and continue - I mean - start moving in
the forward direction? ;-)
Wave cancellation causes the re-reflection but you are essentially
correct as described perfectly on the following web page. Note that
there are only two directions in an RF transmission line. If the energy
stops moving rearward, as it does at a Z0-match, then it must start
moving forward. Walter Maxwell explained all of this decades ago.
http://micro.magnet.fsu.edu/primer/j...ons/index.html
"... when two waves of equal amplitude and wavelength that are 180-
degrees out of phase with each other meet, they are not actually
annihilated. 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 ... Instead, upon meeting, the photons
are redistributed to regions that permit constructive interference, so
the effect should be considered as a redistribution of light waves and
photon energy rather than the spontaneous construction or destruction
of light."
This applies to single frequency coherent glare (reflections). You see,
Jim, the field of optics has no virtual reflection coefficients for
you to hide behind. A change in the index of refraction *always* causes
a reflection in optics. The only possibility of eliminating that reflection
is through wave cancellation. A change in Z0 also always causes a reflection
in RF transmission lines. An S-parameter analysis acknowledges that
fact of physics. Too bad so many RF engineers rely on a virtual
reflection coefficient as a cause when it is merely an end effect.
--
73, Cecil
http://www.qsl.net/w5dxp
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