Conical omni-directional coverage multibeam antenna with parasitic elements
First Claim
1. A multibeam antenna system having a plurality of radiating structures, said antenna system comprising:
- signal providing means, selected from a plurality of signal providing means, for accepting an input signal and providing said input signal to a preselected group of said radiating structures, said group of radiating structures selected such that excitation by said input signal radiates a signal from said antenna system combining to form a wave front having a predetermined beam width, wherein ones of said sigmal providing means provide said input signal to different preselected groups of said radiating structures to thereby provide different predetermined beam widths and other ones of said signal providing means provide said input singal to same preselected groups of said radiating structures to thereby provide same predetermined beam widths; and
means for removably accepting different ones of said plurality of signal providing means in said antenna system, wherein said plurality of radiating structures are provided in a predetermined array configuration adapted to removably accept said different ones of said plurality of signal providing means without altering said predetermined array configuration.
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Abstract
An omni directional coverage multibeam antenna relief on a ground surface having simple conical shapes to provide beam steering is disclosed. 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. Likewise, beam down-tilt may be electrically realized by providing a phase differentiated signal to different antenna sections associated with an antenna beam. Furthermore, modular circuitry may be utilized to provide different beam widths from a single antenna structure design.
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Citations
50 Claims
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1. A multibeam antenna system having a plurality of radiating structures, said antenna system comprising:
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signal providing means, selected from a plurality of signal providing means, for accepting an input signal and providing said input signal to a preselected group of said radiating structures, said group of radiating structures selected such that excitation by said input signal radiates a signal from said antenna system combining to form a wave front having a predetermined beam width, wherein ones of said sigmal providing means provide said input signal to different preselected groups of said radiating structures to thereby provide different predetermined beam widths and other ones of said signal providing means provide said input singal to same preselected groups of said radiating structures to thereby provide same predetermined beam widths; and means for removably accepting different ones of said plurality of signal providing means in said antenna system, wherein said plurality of radiating structures are provided in a predetermined array configuration adapted to removably accept said different ones of said plurality of signal providing means without altering said predetermined array configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An antenna signal feed system for communicating signals between a communication system and a multibeam antenna having a plurality of radiating columns spaced circumferentially around a center point, said system comprising:
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a first antenna feed network module having a first set of connectors and a second set of connectors; each connector of said second set being associated with a particular radiating column of said plurality; and each connector of said first set being in communication with predetermined connectors of said second set, wherein a beam width of said multibeam antenna is a function of the number of said predetermined connectors of said second set in communication with a connector of said first set. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method for providing multiple beams from an antenna system having a plurality of radiating structures disposed in an antenna array, said method comprising the steps of:
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selecting a first signal feed circuit from a plurality of signal feed circuits, each signal feed circuit of said plurality adapted to provide signal communication between an interface of a first set of interfaces and a preselected number of interfaces of a second set of interfaces, said preselected number of interfaces of said second set being selected such that a predetermined beam width of said multiple beams is defined when said signal feed circuit is coupled to said antenna system, wherein said first signal feed circuit is a planar circuit adapted to form a ring wherein said first set of interfaces are disposed about an inside circumference and said second set of interfaces are disposed about an outside circumference; and coupling said first selected signal feed circuit to said antenna system such that each of said second set of interfaces is in communication with a radiating structure of said plurality of radiating structures, wherein said coupling step provides for coupling any of said plurality of signal feed circuits without changing said antenna array. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A multibeam antenna system having a plurality of radiating columns spaced circumferentially around a center point, said antenna system comprising:
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a first antenna feed ring having a first set of connectors disposed around an inner circumference and a second set of connectors disposed around an outer circumference, each connector of said second set being associated with a particular radiating column of said plurality, and each connector of said first set being in communication with predetermined connectors of said second set; a second antenna feed ring having a third set of connectors disposed around an inner circumference and a fourth set of connectors disposed around an outer circumference, each connector of said fourth set being associated with a particular radiating column of said plurality, and each connector of said third set being in communication with predetermined connectors of said fourth set. - View Dependent Claims (45, 46, 47, 48, 49, 50)
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Specification