In article FUB1e.8710$NW5.8590@attbi_s02,
wrote:

It doesn't with my antenna where the lobe gets larger
as radiation is deflected to the forward direction.

There is a harsh limit, imposed by physics, as to how much gain that
approach can give you.

If all of the energy from one hemisphere is redirected into the other
hemisphere, and if the forward-direction pattern shape does not change
(the forward lobe is not narrowed), then you have a forward gain of 3
dB (2:1 power ratio increase). You *cannot* have more, as this would
require that the antenna be radiating more power than it receives from
its input.

A Moxon antenna is, to a first approximation, a pretty good example of
this approach - it has very little energy in the rear hemisphere, and
a broad forward lobe. There are various two-driven-element array
designs which achieve a similar pattern and result.

Obviously with a yagi cancellation is occuring as well as addition.

You are trying to draw a distinction between "deflection" and
"cancellation" which I believe is invalid. Both are simply ways of
describing the result of the "sum of vectors" effects of having energy
from multiple radiators (driven or passive) combining in different
phases at different locations. Same math, two different words.

Do you know what creates the narrowing of the main lobe ?

Conservation of energy *requires* that the main lobe be narrowed, if
you wish to achieve more gain than you can get by simply redistibuting
the rear-ward energy in the forward direction.

A super-high-gain antenna *cannot* have a wide, uniform beam-width in
both azimuth and elevation.

As usual for your postings, Art, it's impossible to tell whether your
claims for your antenna are plausible, because you refuse to disclose
*anything* (either the invention, or the results you claim) in any
halfway-tanglible form (e.g. models, specific numbers, etc.).

Until you do, I really think it would be to everyone's relief if you'd
follow through with your recent statement that you were going to stop
posting. You're achieving no good result for yourself by contining as
you are.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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