Wireless communications using near field coupling

  • US 5,437,057 A
  • Filed: 12/03/1992
  • Issued: 07/25/1995
  • Est. Priority Date: 12/03/1992
  • Status: Expired due to Term
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First Claim
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1. A near field coupled cellular communication system for providing two-way communication services within a predetermined service area that is composed of a plurality of service cells;

  • said system comprisinga plurality of stationary base stations that are spatially located within respective ones of said service cells, each of said base stations having an antenna for transmitting output signals and for sensing input signals, with the antenna of each of said base stations has two loops that are physically oriented in quadrature relationship with respect to each other, and with each of said base stations including means for driving the loops of its antenna in phase quadrature to transmit said output signals, and means for combining signals sensed by the loops of its antenna in phase quadrature to sense said input signals;

    at least one portable station that is transportable from position-to-position and from cell-to-cell within said service area, each portable station having an antenna for transmitting output signals and for sensing input signals;

    said base stations being positioned to cause the antenna of each portable station that is within said service area to be near field coupled to the antenna of at least one of said base stations whenever signals are being transferred in either direction between said portable station and said base station, with the near field coupling of said antennae being sufficiently strong to predominantly govern the transfer of said signals;

    said signals being modulated carrier signals, with each of said signals having a carrier that has an angular frequency of approximately ω

    radians/sec.; and

    every point within said service area is located within a distance of approximately rsecondary =c/ω

    of the antenna of at least one of said base stations, where c is the speed of light.

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