Patents by Inventor Stuart J. Dean

Stuart J. Dean has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8311582
    Abstract: A method and apparatus for increasing capacity and performance of a base station for a sectorized cellular wireless network is disclosed in which one of the sector antennas is replaced or supplanted by a novel sub-sector antenna that generates a plurality of asymmetrical sub-sector coverage areas that collectively substantially cover the coverage area of the replaced sector antenna. The use of asymmetrical coverage areas permits the total coverage area to closely approximate the symmetrical sector coverage area without creating excessively large sub-sector handover zones or introducing severe degradation in the network performance. This in turn permits the selective replacement of a single sector antenna rather than the wholesale replacement of all sector antennas in a region, leading to lower transitional costs and the ability to provide a focused approach to capacity planning.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: November 13, 2012
    Assignee: TenXc Wireless Inc.
    Inventors: Hafedh Trigui, Stuart J. Dean, John Litva
  • Patent number: 8077093
    Abstract: A patch radiator for use in beamformed or steerable antenna systems which maximizes upper frequency limit and simultaneously minimizes the lower frequency limit, by providing an annular patch configuration in which a central region of the patch element is devoid of material, whereby this central region is of a different shape from the shape of the exterior perimeter of the patch element. One possible configuration of such a patch radiator comprises a square exterior shape, enclosing a central circular region of removed material. In this manner, the upper frequency limit threshold tends to rise as the interior annular perimeter is reduced. Preferably, the exterior and interior perimeters have no interior angles of more than 180°.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: December 13, 2011
    Assignee: TenXc Wireless Inc.
    Inventor: Stuart J. Dean
  • Publication number: 20090163214
    Abstract: A method and apparatus for increasing capacity and performance of a base station for a sectorized cellular wireless network is disclosed in which one of the sector antennas is replaced or supplanted by a novel sub-sector antenna that generates a plurality of asymmetrical sub-sector coverage areas that collectively substantially cover the coverage area of the replaced sector antenna. The use of asymmetrical coverage areas permits the total coverage area to closely approximate the symmetrical sector coverage area without creating excessively large sub-sector handover zones or introducing severe degradation in the network performance. This in turn permits the selective replacement of a single sector antenna rather than the wholesale replacement of all sector antennas in a region, leading to lower transitional costs and the ability to provide a focused approach to capacity planning.
    Type: Application
    Filed: March 19, 2007
    Publication date: June 25, 2009
    Applicant: TENXC WIRELESS INC.
    Inventors: Hafedh Trigui, Stuart J. Dean, John Litva
  • Publication number: 20090091499
    Abstract: A patch radiator for use in beamformed or steerable antenna systems which maximizes upper frequency limit and simultaneously minimizes the lower frequency limit, by providing an annular patch configuration in which a central region of the patch element is devoid of material, whereby this central region is of a different shape from the shape of the exterior perimeter of the patch element. One possible configuration of such a patch radiator comprises a square exterior shape, enclosing a central circular region of removed material. In this manner, the upper frequency limit threshold tends to rise as the interior annular perimeter is reduced. Preferably, the exterior and interior perimeters have no interior angles of more than 180°.
    Type: Application
    Filed: March 9, 2007
    Publication date: April 9, 2009
    Applicant: TENXC WIRELESS INC.
    Inventor: Stuart J. Dean
  • Patent number: 5602555
    Abstract: An antenna for a base station comprising a plurality of antenna arrays (40; FIG. 6a) each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the of beams formed by the arrays provide a coverage in azimuth wider than each array. Means are provided for recognizing unique identifier signals (70; FIG. 6b) incorporated in call signals passing through the antenna; and coherent detection means for discriminating between unwanted call signals and wanted call signals using said unique identifier signals.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: February 11, 1997
    Assignee: Northern Telecom Limited
    Inventors: Jeffrey G. Searle, Stuart J. Dean, Peter J. Chrystie, Keith R. Broome, Christopher R. Cox, Stephen J. Westlake
  • Patent number: 5603089
    Abstract: A base station antenna arrangement comprising a plurality of antenna arrays each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the totality of beams formed by the arrays provides a substantially omni-directional coverage in azimuth, azimuth and elevation beamforming means for each array, a plurality of r.f. transceivers each for transmitting and receiving r.f. signals for one or more calls, switching matrix means for connecting each transceiver with one or other of the arrays via the beamforming means, control means for controlling the switching matrix means whereby a particular transceiver is connected to a particular array via the beamforming means to exchange r.f. signals with a remote station located in the area covered by one of the narrow beams.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: February 11, 1997
    Inventors: Jeffrey G. Searle, Stuart J. Dean, Keith R. Broome, Peter J. Chrystie, Christopher R. Cox
  • Patent number: 5596329
    Abstract: A smart antenna for a base station comprises a plurality of antenna arrays each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the totality of beams formed by the arrays provides a substantially omni-directional coverage in azimuth A plurality of r.f. transceivers is provided each for transmitting and receiving r.f. signals for one or more calls, with switching matrix means for connecting each transceiver with one or other of the arrays via beamformers. Each transceiver is connected by a switch matrix to a particular array to exchange r.f. signals with a remote station located in the area covered by one of the narrow overlapping beams. Means are provided for selecting for a given call more than one of the best received signals from the multiplicity of narrow overlapping beams and the selected signals are combined to form a single receive signal input for the r.f. transceiver for the given call.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: January 21, 1997
    Assignee: Northern Telecom Limited
    Inventors: Jeffrey G. Searle, Stuart J. Dean, Peter J. Chrystie, Keith R. Broome, Christopher R. Cox, Stephen J. Westlake
  • Patent number: 5576717
    Abstract: An antenna for a base station comprising a plurality of antenna arrays (40; FIG. 6a) each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the of beams formed by the arrays provide a coverage in azimuth wider than each array. Means (54; FIG. 6a) are provided for independent adjustment of receiver gain and/or transmitter radiated power level of individual beams.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: November 19, 1996
    Assignee: Northern Telecom Limited
    Inventors: Jeffrey G. Searle, Stuart J. Dean, Keith R. Broome, Peter J. Chrystie, Christopher R. Cox
  • Patent number: 5565873
    Abstract: An antenna for a base station comprising a plurality of antenna arrays (40; FIG. 6a) each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the beams formed by the arrays provide a coverage in azimuth wider than each array. Means are provided for operating (FIG. 12a, FIG. 12b) two or more non-collocated narrow beamwidth antenna arrays to form jointly a broad beamwidth antenna radiation pattern wherein the time averaged antenna pattern is substantially null free.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: October 15, 1996
    Assignee: Northern Telecom Limited
    Inventor: Stuart J. Dean