Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1982-08-30
1984-10-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
High frequency type loops
343700MS, H01Q 1114
Patent
active
044791275
ABSTRACT:
A bi-loop antenna system comprises an array of four bi-loop antennas equally spaced from the array axis and fed in phase and with equal power. Each antenna comprises an electrical conductor configured as two substantially identical open-ended coplanar loops, preferably square in shape, having colinear axes parallel to the array axis and electrically connected together, the open ends defining two closely spaced feed points at the middle of the array. The array is fed by a four-way coaxial power divider with output ports connected to the antennas, respectively, remote from the feed points thereof by coaxial lines of equal length. A balun comprising a portion of one of the loops of each antenna and a closely spaced coextensive conductive strip connects the inner and outer conductors of the coaxial cable to the two feed points, respectively, of the antenna. In a preferred embodiment, the conductors of each antenna are formed on a dielectric sheet or board by printed circuit techniques. This antenna system produces a horizontally polarized omnidirectional radiation pattern over an octave bandwidth and has a VSWR response of the input impedance with a value less than 2:1 over the octave bandwidth.
REFERENCES:
patent: 2657313 (1953-10-01), Antony
GTE Products Corporation
Lawler John F.
Lieberman Eli
Ohralik K.
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