Zack and Bill's explanations were good regarding Mark's question. The
polarization of an antenna depends on the orientation of the electric field.
Recall electromagnetic radiation (radio waves) consists of an electric field
and magnetic field.
>From N6NB regarding polarization of quad loop yagis:
"Although the quad loops are square or circular, the antenna is linear in
polarization, not circular. If it is fed at the bottom, the antenna will be
horizontally polarized. Feed the antenna on either side for vertical
polarization (and then mount the directors vertically, not horizontally."
http://n6nb.com/quagi.htm
- Jon N0JK
________________________________
Hi does anyone know of a web site that explains why loop yagis are horizontally
or vertically linearly polarized ?
73
Mark S
VE7AFZ
------------------------------
It's basically the same idea as with a quad antenna. A loop (either
circular or square) fed at the bottom or top has current peaks at the
feedpoint and opposite side of the quad or loop, and voltage peaks at the
side points (90 degrees to the feedpoint). This is similar to a horizontal
dipole antenna, which has horizontal polarization.
There's more to it than that, but that's the basic idea.
73, Zack W9SZ
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