| 摘要 |
An apparatus for sensing tire information including information about tire pressure includes 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 includes a sensor for sensing the tire information and a second mixing unit for mixing first and second signals and outputting a difference signal having a frequency equal to a difference in frequency between the first and second signals. The interrogator includes a power combining circuit for combining the first and second signals. The first signal is different from the second signal by a predetermined frequency that can excite the sensor. In the transmission period, a combined signal of the first and second signals is transmitted from an antenna of the interrogator.
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