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Duplex RF repeater for personal communications system

  • US 5,812,933 A
  • Filed: 10/23/1995
  • Issued: 09/22/1998
  • Est. Priority Date: 12/30/1992
  • Status: Expired due to Fees
First Claim
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1. For use in a mobile wireless communication system, a duplex RF repeater for distributing and enhancing at least one single RF carrier on which both a transmitter and a receiver for a base station are operated in the time division duplex mode, to improve the efficiency of the frequency usage in a serving area and to improve the quality of the communications between the base station and a subscriber unit, said duplex RF repeater comprising:

  • (a) divider means for enabling said RF carrier to be transmitted from said base station towards said subscriber unit, and to be transmitted from said subscriber unit towards said base station, including first and second divider means, said first divider means for coupling said RF carrier transmitted from the subscriber unit towards the base station;

    (b) a first up-link connection means to connect a first RF transmission cable for transmitting said RF carrier directed towards the base station, an up-link amplification means for amplifying said RF carrier, a second up-link connection means to connect an up-link RF transmission cable for receiving said RF carrier transmitted from the subscriber unit, said first divider means coupling said second up-link connection means with a common connection means;

    (c) said second divider means for coupling said RF carrier transmitted from the base station towards the subscriber unit;

    (d) a first down-link connection means to connect a second RF transmission cable for receiving said RF carrier transmitted from the base station, a down-link amplification means for amplifying said RF carrier, a second down-link connection means to connect a down-link RF transmission cable for transmitting said RF carrier directed towards the subscriber unit, said second divider means coupling said second down-link connection means with said common connection means;

    (e) an isolation means having control means for controlling said up-link and down-link amplification means for ensuring sufficient isolation between said up-link connection means and said down-link connection means even on said one single RF carrier to prevent a self-oscillation caused by a coupling between said up-link connection means and said down-link connection means; and

    (f) said first and second divider means coupling even said one single RF carrier, and providing said common connection means to connect an output RF transmission cable for transmitting and receiving said RF carrier directed toward and transmitted from the subscriber unit.

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