Communications: radio wave antennas – Antennas – Wave guide type
Patent
1986-07-30
1988-04-12
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343909, 343910, H01Q 1914
Patent
active
047377968
ABSTRACT:
The radiation pattern of a beam at elevation angles near the horizon is improved for phased array antennas by control of the radiation field intensity near the horizon to reduce multipath disturbances, and to improve the axial ratio of a circularly polarized phased array antenna. This is accomplished by placing a parasitic phase shifting element directly below the antenna beam axis. The waveguide section is designed to produce a phase shift in the portion of antenna radiation energy passing through it to cancel some of the radiation energy in the direction of the horizon. The spacing of the waveguide section in front of the antenna is determined empirically for optimum results, i.e., for reduction of beam power below about 20.degree. without affecting beam power at high elevation angles.
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Bonebright Mark E.
Killion Derling G.
Jones Thomas H.
Le Hoang-anh
Manning John R.
McCaul Paul F.
Sikes William L.
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