Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-02-28
2000-07-25
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, 342375, 342403, 342406, 343891, 343893, H01Q 302, H01Q 312
Patent
active
060941669
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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patent: 5861844 (1999-01-01), Gilmore et al.
Elson Todd
Martek Gary Allen
Blum Theodore M.
Metawave Communications Corporation
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