Yeh, you can get better gain, bandwidth AND lower sidelobes. See
'Optimization of Wire Antennas', Landstorfer and Sacher, Wiley Interscience,
1985.
The Innova designs use end-bends to shrink the projected size of the
element. The ends do very little to the radiation pattern in the far field on
those size scales.
Moxon's are nothing more than 2 element Yagis with end bends. There is
virtually no coupling at the voltage max's for the driven and parisitic==so the
ends can be placed fairly close together. Same with spider beams, hex
beams, yadayada.
The Innova design looks like a nice offering for the ham market. The
multiband coupling is also well known: Gary Breed (who publishes Hi Frequency)
has a patent on that.
73,
Chip W1YW
--------------------------------
In a message dated 3/20/2013 8:48:46 A.M. Eastern Daylight Time,
n4zr@contesting.com writes:
yes, in a classic yagi with straight and parallel elements that is true...
but when you bend or make the driven element not a simple half wave dipole
then it can have an effect on the pattern by itself.
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|