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Apparatus for sensing tire information, reducing distortion of amplitude-modulated wave

  • US 20060109100A1
  • Filed: 11/03/2005
  • Published: 05/25/2006
  • Est. Priority Date: 11/09/2004
  • Status: Abandoned Application
First Claim
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1. An apparatus for sensing tire information including information about tire pressure, the apparatus comprising:

  • an interrogator for transmitting an interrogation signal to a vicinity of a tire of a vehicle in a transmission period and for receiving and processing a response signal including the tire information in a reception period; and

    a transponder attached to the tire, the transponder including a sensor capable of being excited by a signal having a predetermined frequency, the sensor sensing the tire information, the transponder sending the response signal to the interrogator in response to the interrogation signal in the reception period, wherein the interrogator includes;

    a first oscillator for outputting a first signal;

    a second oscillator for outputting a second signal, the first signal and the second signal constituting the interrogation signal, a frequency of the first signal being different from a frequency of the second signal by the predetermined frequency;

    a power combining circuit for combining the first signal and the second signal; and

    an antenna connectable to a combining output terminal of the power combining circuit, wherein the transponder includes a first mixing unit for mixing the first signal and the second signal and outputting a difference signal having a frequency equal to a difference in frequency between the first signal and the second signal, and wherein, in the transmission period, a combined signal of the first and second signals is transmitted.

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