Alford loop

Alford loop

[′ȯl·fərd ‚lüp]
(electromagnetism)
An antenna utilizing multielements which usually are contained in the same horizontal plane and adjusted so that the antenna has approximately equal and in-phase currents uniformly distributed along each of its peripheral elements and produces a substantially circular radiation pattern in the plane of polarization; it is known for its purity of polarization.
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References in periodicals archive ?
From Modern Antenna Design by Milligan [2], "An Alford loop feeds two dipoles curved into a loop that radiates an omnidirectional pattern with horizontal polarization when located horizontally over a ground plane.
When the elements of the folded dipole and the Alford loop are combined, the desired impedance match can be achieved using the properties of a folded dipole, and the desired radiation pattern can be reached from the Alford loop shape.
There is no imaginary component of the input impedance because the Alford loop is a resonant loop antenna.
Adopting the left-hand loading loop [16] and the Alford loop structure [17] can obtain good impedance match, but which have a disadvantage of complicated configuration.
The most famous HP omnidirectional wire-structure antenna is the Alford loop [13].
Omni-directional horizontally polarized Alford loop strip antenna," US Patent 5767809, Jun.