On 26 Dec, 14:46, "AI4QJ" wrote:
"art" wrote in message

...

Food for thought
About ten years ago a sattelite generated a barium
(diamagnetic ) cloud in space. When this cloud was
penetrated *they found a cavity inside where there
was an electric *field in which there was current flow.
This does not state that the return current actually
flows thru the inside of a radiator, only that current
flow is possible on the IINSIDE of a diamagnetic
material.

For a static e field, of course, that would depend on the conductivity of
the material. Barium being a metal would be a better conductor than, say,
porcelain, another diamagnetic material. I doubt you would measure current
flow across an electric field thru porcelain, unless the field were time
varying.

I am not knoweledgable about those things but it does bother
me that it is accepted that the current on the antenna flows
up and then retraces its path on the way down.
For myself I do not understand why the flow is not down the
center within the underside of the so called surface skin.
For instance, if we had a half wave length surface then
the radiation would or should be equal to one full wave
length radiator. When I place a radiator inside a Gaussian
field it has to be near or at a full wave length to be resonant
and in equilibrium where the surface is what contains the
inductance and capacitance which are for the extremities of
movement for a parallel circuit and the return route must
be resistive only.
If I place one or more random length radiators of approx one wave
length with varying heights along its length into a antenna
program with an optimiser where it represents a gaussian
field,i.e. in equilibrium, the result will always be a non
planar array where the majority of elements are resonant
and at different angles and where the chosen fed element
drives all elements as one element by virtue of the array
being in equilibrium.Thus with varying heights the array
gets added gain but with a single feed point
If a half wave antenna is inserted initially that
would reflect the notion that the current travel was
2 X radiator length and thus the
array should consist of 1/2 wave radiators, which doesn't
compute!I.E resonant but not in equilibrium.
To me, this suggests that the return path is
down the center which is resistive only. My prior post
states that it is possible for current flow down the
center of a dimagnetic material which was the case
in a barium cloud.
From the above in then becomes logical that RADIATING
surface length is what counts and thus a helical antenna
must have a counter winding to be resonant AND in equilibrium.
So the main pont is, what exactly stops current travel down
the center of a radiator to conform with every day thinking?
Art