Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-07-31
2000-07-25
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342361, 342362, 455422, 455424, H01Q 322, H01Q 324, H01Q 326
Patent
active
060941650
ABSTRACT:
A beam forming apparatus and method for forming a plurality of directional beams within a sector, as well as a full sector coverage beam is disclosed, wherein uplink reception diversity is maintained, through provision of a either a single facet antenna or a pair of single facet antennas. Two implementations are disclosed: a first implementation employs orthogonal polarization diversity from a single antenna facet, whereas a second implementation employs space diversity from a pair of spaced apart antenna facets. A first implementation employing polarization diversity comprises an antenna having an array of dipole pairs, dipoles of each pair being positioned orthogonally from each other. The dipole pairs are driven on a downlink, to form a plurality of directional beams having first polarization, and a full sector coverage beam having second polarization. On an uplink, a first plurality of directional beams have first polarity and a second cospatially overlapping set of directional beams have second polarity are formed. A first full sector coverage beam having first polarity spatially overlaps a second full sector beam having second polarity.
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patent: 5563610 (1996-10-01), Reudink
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patent: 5682168 (1997-10-01), James et al.
"Wireless Mobile Data Networking--The CDPD Approach," dated Jul. 16, 1997, http://www.cdpd.org/public/whatis/whatis.html.
Blum Theodore M.
Nortel Networks Corporation
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