Keith Dysart wrote:
Also consider that field lines never cross. It would
therefore seem impossible for the two electric fields
associated with two EM waves to pass each other
without interaction.

They certainly superpose so the field lines don't
cross but superposition doesn't cause interaction
in free space or in a constant-Z0 transmission line
where neither medium changes. Free space superposition
results in zero reflections.

And whether the wave in space is viewed as passing
or bouncing, the results should be the same, just
as it is on a transmission line.

Any "view" is possible in your mind but not every
view of yours that is possible is associated with
reality. Your view could just as easily be the
same as my mother's (RIP), i.e. that God is
responsible for everything.

If your view is disassociated from reality, it is
no better than a religion.
--
73, Cecil http://www.w5dxp.com