Patent ID: 6995731
Filing Date: 2006-02-07
Classification: B60C,H01Q

Abstract:
1. A tire parameter sensing system for sensing a parameter of a tire of a vehicle, the tire parameter sensing system comprising: a vehicle-based unit; and a tire-based unit that is associated with the tire of the vehicle, the tire-based unit being operative for sensing the parameter of the tire and for providing an indication of the sensed parameter to the vehicle-based unit, the vehicle-based unit and the tire-based unit including associated structures for inductively coupling the tire-based unit to the vehicle-based unit so as to provide electrical energy to the tire-based unit, the associated structures including an antenna having first and second coils and a capacitor, the first coil having a first inductance value, the second coil having a second inductance value, and the 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.