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Anti-theft system for a motor vehicle

  • US 6,100,603 A
  • Filed: 11/24/1998
  • Issued: 08/08/2000
  • Est. Priority Date: 11/24/1997
  • Status: Expired due to Fees
First Claim
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1. An anti-theft system for a motor vehicle, comprising:

  • a transceiver unit disposed in a motor vehicle;

    at least two antennas disposed separate from one another in the motor vehicle and electrically connected to said transceiver unit, each of said antennas being adapted to transmit a transmission signal and receive a receiving signal;

    a main control unit connected to said transceiver unit, said main control unit evaluating receiving signals received by said antennas; and

    a power control unit and a phase control unit controlled by said main control unit for selectively and individually controlling a transmission power and a phase of each of said transmission signals to prevent undesired feedback on said phase or said transmission power of said transmission signals from occurring.

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