Tom Donaly wrote:
The purpose of most antennas is to radiate electromagnetic waves.
That means there is loss. It also means that the current envelope is
affected. That's one of the reasons we use EZNEC.

The current envelope is affected but remains a linear
system function since it is the result of superposition
which itself is a linear system function.

I suppose, Cecil,
that if you keep repeating the same old tired line, over and over
again, you might find someone who will agree with you. Certainly,
no antenna measurement would.

The current envelope is a linear system function. I am
repeating the rules and laws of mathematics. Sounds
like you need to review the definition of linear systems.
You can do that at:

http://www.cns.nyu.edu/~david/linear...r-systems.html

In particular, quoting: "Systems that satisfy both homogeneity
and additivity are considered to be linear systems. These two rules,
taken together, are often referred to as the principle of superposition."

In general, antennas are linear systems that satisfy the principle
of superposition. If they were non-linear, they would not satisfy
the principle of superposition. Two linear system functions, like
forward waves and reflected waves, cannot superpose to a non-linear
function. Therefore, standing waves are linear, not non-linear,
functions. To argue otherwise exhibits a certain degree of ignorance.

Until the obvious mathematical misconception is corrected, no
rational discussion is possible. To the best of my knowledge,
Maxwell's equations are also linear system functions so claims
of non-linearity also contradict Maxwell's equations.
--
73, Cecil http://www.qsl.net/w5dxp