Conical omni-directional coverage multibeam antenna
First Claim
1. An antenna system comprising:
- a plurality of radiating structures spaced circumferentially around a center point;
a ground surface circumferentially located around said center point and between said center point and each of said radiating structures, said ground surface circumscribing a volume substantially perpendicular to a surface upon which signals transmitted from a radiating structure are to be received on; and
a feed network coupled to each radiating structure of the plurality of radiating structures, wherein the feed network includes a plurality of signal interfaces each associated with a different antenna beam and each coupled to a different selected subset of the radiating structures.
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Accused Products
Abstract
An omni directional coverage multibeam antenna relief on a ground surface having simple conical shapes to provide beam steering. One advantage of such a system is that the projected area is always constant and broadside to the intended direction resulting in limited scan loss effects. In the case of a cylinder as the conical shape, z-axis symmetry provides a constant antenna aperture projection in any azimuthal direction. Using this geometry, high level, side lobes are reduced considerably because of the natural aperture tapering from dispersion effects. Coverage area and power can be controlled by changing the ground surface angle and by selectively activating different antenna beam positions around the circumference of the ground surface, and by selectively changing the phase relationship between a given set of antenna beams.
27 Citations
37 Claims
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1. An antenna system comprising:
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a plurality of radiating structures spaced circumferentially around a center point; a ground surface circumferentially located around said center point and between said center point and each of said radiating structures, said ground surface circumscribing a volume substantially perpendicular to a surface upon which signals transmitted from a radiating structure are to be received on; and a feed network coupled to each radiating structure of the plurality of radiating structures, wherein the feed network includes a plurality of signal interfaces each associated with a different antenna beam and each coupled to a different selected subset of the radiating structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A cellular antenna comprising:
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a plurality of antennas spaced apart from a next adjacent antenna an equidistance from a central point forming a circle around the central point; and means for controlling the phase relationship of a signal provided on a selected one of the antennas with respect to the same signal provided on ones of the antennas adjacent to the selected one antenna, wherein said phase relationship controlling means includes a plurality of signal interfaces each of which is associated with a unique preselected subset of the plurality of antennas, and wherein a different predefined narrowly focused antenna beam is formed with respect to signals associated with each signal interface. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. An antenna system having a plurality of radiating structures spaced circumferentially around a center point, each radiating structure spaced equidistant from and parallel to a next adjacent radiating structure, said system comprising:
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a ground surface circumferentially located around said center point and between said center point and each of said radiating structures, wherein the ground surface has a top and a bottom edge and wherein each of these edges is rounded inward to form a side lobe suppressor torus; and means for phase shifting a transmission signal from certain activated ones of said activated radiating structures a selected delay amount, the phase shift amount being selected such that the transmission signal wave front leaving said certain activated radiating structures is in a relatively straight line substantially perpendicular to the direction of travel of said transmission signal. - View Dependent Claims (36, 37)
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Specification