System and method of producing a null free oblong azimuth pattern with a vertically polarized traveling wave antenna
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United States of America Patent
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Mar 23, 2010
Grant Date -
Apr 3, 2008
app pub date -
Jul 12, 2007
filing date -
Sep 29, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vertically polarized traveling wave antenna forms peanut-type directional lobes without significant nulls between the lobes. A self-supporting coaxial line feeds quad-dipole bays coupled around the coaxial line, with opposed dipole pairs spaced along the coaxial line. Matched-layer spacing provides substantial cancellation of the reactive components of the loads. Dipoles are oriented parallel to the coaxial line axis, with opposite “hot” (center coupled) elements oppositely oriented. Radiated signals have rotating phase. Changing the spacing within quads from a quarter wavelength or rotating the second dipole pair of each quad away from a right angle causes the antenna to radiate strongly on one axis and weakly at right angles thereto, without the nulls of back-to-back panel antennas.
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