On 01/11/2014 16:17, Frank Turner-Smith G3VKI wrote:
On 01/11/14 15:26, gareth wrote:
Ignoring, for the moment, travelling wave antenna, and restricting
discussion to standing wave antennae ...

A wave is launched, and radiates SOME of the power, and suffers
both I2R losses and dielectric and permeability losses associated
with creating and collapsing the near field.

At first, there is no standing wave, until the wave reaches the point of
reflection
in the antenna and heads back the way it has come (because not all has
been
radiated*****)
On the way back, it again suffers the losses described above, as well as
radiating a
bit more.

It then reaches the other end and suffers further reflections ad
infinitum.

An interesting conclusion is, therefore, that the I2R losses are
repeated,
each time with a smaller loss, as the wave decrements.

***** Without the remnants of non-radiated power, there could NOT be
a standing wave!

I don't think anybody would dispute what you say here, so what's to
discuss?

I would dispute the statement "Without the remnants of non-radiated
power, there could NOT be a standing wave!"

But I'm not as clever as Gareth, so I'll sit at the back of the room
with my dunce's cap on and keep quiet :-)