Cecil Moore wrote:

[snip]

However, I am wondering if I am using the wrong word when
I say interference can cause reflections. Since the same
thing happens with scattering S-parameters, it may be
a 180 degree refraction instead of a 180 degree reflection.
I'll have to take a look at the math.

Cecil,

You may have taken the first step along the path to enlightenment. It
has been explained previously on RRAA that interference is a result, not
a cause. There are no primary equations related to interference that are
useful for analyzing the exact behavior of a system. Sure, there are
lots of handwaving explanations, but nothing that can actually give real
numbers for fields, currents, or whatever.

If you start with the proper equations for the fields, or voltage and
current if you desire, add in the correct boundary conditions on the
interfaces, and then find the numerical solution, any interference will
appear. No need to make a special case.

If you do this then two positive things will occur.

1. You will be in accord with virtually every mathematician, physical
scientist, optical scientist, and even engineer in applying standard
analysis techniques.

2. All of the worry about missing energy, canceling waves at the
interfaces, etc. simply disappears. It all pops right out from the
proper application of the math, automatically.

73,
Gene
W4SZ