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In-building microwave communication system permits frequency refuse with external point-to-point microwave systems

  • US 5,355,520 A
  • Filed: 11/30/1990
  • Issued: 10/11/1994
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Term
First Claim
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1. A wireless radio frequency (RF) communication system disposed in a building having windows, operating on a first frequency which is also available for use by a different communications system located outside of the building, the in-building communications system comprising:

  • a central module (CM) that includes an RF transmitter, RF receiver and antenna system;

    a plurality of user modules (UM) each including an RF transmitter for transmitting signals to said CM receiver, an RF receiver for receiving signals from said CM transmitter, and an antenna system consisting of unidirectional antennas each having a predetermined horizontal pattern beamwidth and being oriented to provide substantially 360°

    of total horizontal pattern coverage for each UM; and

    switching means, coupled to the UM antenna system, for limiting the magnitude of RF signals exiting said building to a predetermined level, said predetermined level being below a transmit signal level for the different communication system by at least the capture ratio of the different communication system, to prevent interference to the different communications system located outside of the building.

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