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Multiple coil antenna for a tire parameter sensing system with inductively coupled tire-based units

  • US 20050190114A1
  • Filed: 02/27/2004
  • Published: 09/01/2005
  • Est. Priority Date: 02/27/2004
  • Status: Active Grant
First Claim
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1. An antenna for use in inductive coupling two devices, the antenna comprising:

  • a first coil having a first inductance value;

    a second coil having a second inductance value; and

    a capacitor having a capacitance value, the first and second coils and the capacitor forming a tank circuit having a predetermined resonant frequency, the capacitance value of the capacitor varying inversely to an equivalent inductance value of the tank circuit for providing the predetermined resonant frequency, the first and second coils being connected in parallel with one another so that the equivalent inductance value of the tank circuit is less than each of the first and second inductance values and the capacitance value of the capacitor is maintained above a predetermined threshold value for providing stability to the tank circuit.

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