8130Re: [loopantennas] Re: Loop reflector
- Jan 5, 2011
> A horizontal 1 wavelength loop, if up sufficently high, has a radiationWhere did you hear that?
> pattern almost identical to a half wave dipole- that is a figure 8 pattern.
A full wavelength loop, in free space, has a pattern that looks like a
dumbbell: two major lobes in opposite directions (perpendicular to the
loop), and a null going a full 360 degrees around it in the plane of
A half wave dipole has a pattern like a donut, which is almost exactly
So I'm trying to figure out what orientations of the loop and of the
dipole you are envisioning.
Most half wave wire dipoles are horizontal, and tend to have maximum
signal broadside to the wire, and nulls off the ends (except for
interaction with the earth or ionospheric reflections). A full wave
loop at any height is essentially nondirectional with respect to its
axis. Its primary radiation is straight up and straight down, so it
makes a good antenna for high angle signals; though if you mount it a
half wave above earth, it may get a null going straight up due to
cancellation with its reflection.
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