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Old January 7th 09, 03:34 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jun 2006
Posts: 440
Default Does NEC-2 model wires as solid or hollow?

On Jan 3, 10:37*am, Art Unwin wrote:
There is absolutely NO evidence that
reflection occurs in any shape or form at the
material ends of a radiator and all that pertains
to such. * *PERIOD.

____________

Art, the link below leads to empirical proof that such reflections
exist.

H. Gihring and G. Brown of RCA measured the relative current
distribution parallel to the axis of monopole radiators of several
lengths and widths, using an r-f current probe driving a thermal
meter.

The current distribution measured for the three radiator lengths
plotted all show the presence of reflections from the top of the
vertical wire, and in all three cases, current falls to zero at the
end of the radiator.

These are all fractional wavelength radiators not meeting your
definition of an antenna in "equilibrium."

This demonstrates that r-f current does not travel on the outside of a
wire on the way to the open end, and return from the open end along a
non-radiating path down the center of that conductor, as you believe.

http://i62.photobucket.com/albums/h8...reAntennas.gif

RF
 
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