I should think that if you optimized the antenna, there wouldn't be a
significant difference between feeding at the back or the front.
Feeding in the middle is always going to be better. In fact, doing a
quick optimization, I get F/B ratios within 0.5 dB and gains within
0.5dB for feeding either the front or the back element
73, ... Joe, K4IK
If I recall from a friend who was optimizing 6M beams he said that
other than the initial gain/pattern value of the first reflector the
second best value of the reflector was keeping signals "off the back"
to a minimum. I think he added a second to optimize that effect and
then added a couple of directors to end up with a very narrow focal
point in his pattern.
I am guessing that no reflector and all directors would make for a
gain antenna with poor FB ratio.
I'd guess that all reflectors and no directors would have a broad
pattern off the front and severe restriction of signals off the back.
Are your software runs not showing that to be so?
73, doc kd4e
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