Art Unwin KB9MZ wrote:
My point is that
understanding and agreement will only come when clarity is applied as to why
Eznec cannot solve the problem. and replace it.

The basic problem is that there is a phase shift through every real-world
coil. The lumped inductive reactance model that EZNEC uses doesn't account
for any phase shift. If one takes a look at the page of Diamond vhf/uhf
antennas in QST, one will observe phasing coils in every one of them.
The radiation patterns of these antennas cannot be modeled with EZNEC
using the simple lumped inductive reactances. I and others have demonstrated
a work-around for horizontal phased arrays by simply using multiple sources
or phase-reversing stubs. There exists a 1/2WL of wire with an undesirable
current phase. Folding it into a 1/4WL stub works to minimize radiation.
Mashing it into a coil works to a certain extent. Even fractal folding would
probably work to perform that radiation minimizing function while bringing
the radiating array elements into physical alignment.
--
73, Cecil http://www.qsl.net/w5dxp



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