Mike Monett wrote:
However, electromagnetic waves do not interact with each other, and
they cannot bounce off each other.

Mike, can we add "do not interact with each other" in
*an unchanging medium*? Coherent waves can apparently
interact at a change in mediums (impedance discontinuity).

One of the s-parameter equations illustrates that apparent
fact.

b1 = s11*a1 + s12*a2 = 0

Assuming a1 and a2 are non-zero forward and non-zero reflected
voltages, the only way they could superpose to zero is to
interact at the impedance discontinuity.
--
73, Cecil http://www.w5dxp.com