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Magnetic field sensor for a keyless access system for motor vehicles

  • US 5,940,003 A
  • Filed: 03/26/1998
  • Issued: 08/17/1999
  • Est. Priority Date: 03/27/1997
  • Status: Expired due to Fees
First Claim
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1. A magnetic field sensor for a remote-controlled vehicle entry system comprising a first conductor loop and a second conductor loop in the form of coils located substantially in the same plane, said first conductor loop having a longitudinal axis directed between opposite sides of a vehicle, and said second conductor loop being arranged concentrically with said first conductor loop and being shaped symmetrically with respect to a common center point of said first and second conductor loops, wherein said first conductor loop crosses over itself substantially at said common center point so that transmitter signals received by said first conductor loop from a direction substantially along said longitudinal axis are phase-shifted with respect to signals received by said second conductor loop, and wherein the direction of said phase shift identifies from which of said opposite sides of said vehicle said transmitter signals originated.

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