Motion/vibration sensor

  • US 9,375,153 B2
  • Filed: 01/10/2014
  • Issued: 06/28/2016
  • Est. Priority Date: 05/17/2010
  • Status: Active Grant
First Claim
Patent Images

1. A motion/vibration sensor, including:

  • a transmit/receive antenna unit;

    an oscillation unit, coupled to the transmit/receive antenna unit; and

    a frequency-mixing unit coupled to the transmit/receive antenna unit and the oscillation unit;

    wherein the transmit/receive antenna unit receives an output signal from the oscillation unit and transmits a detection signal toward at least one object according to the output signal;

    the detection signal is reflected by the object as a reflected detection signal and received by the transmit/receive antenna unit;

    the oscillation unit receives the reflected detection signal from the transmit/receive antenna unit for self-injection locking and the frequency-mixing unit receives the reflected detection signal from the transmit/receive antenna unit for frequency demodulation; and

    the frequency-mixing unit mixes and demodulates the reflected detection signal from the transmit/receive antenna unit with the output signal from the oscillation unit into a baseband output signal which represents a motion/vibration information.

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