Patent ID: 8665098

Claim:
A non-contact motion detection apparatus, comprising: at least one reception antenna for receiving a first wireless radio frequency (RF) signal; at least one transmission antenna for transmitting a second wireless RF signal to an object under measurement which reflects the second wireless RF signal into the first wireless RF signal; a voltage-controlled oscillator (VCO) coupled to the at least one reception antenna and the at least one transmission antenna, for outputting an oscillation signal to the at least one transmission antenna, wherein the first wireless RF signal received by the at least one reception antenna is injected to the VCO; and a phase lock loop (PLL) for generating a control voltage into the VCO according to the oscillation signal generated by the VCO and a reference frequency, wherein under controlled by the control voltage, the oscillation signal of the VCO is locked to the reference frequency and the control voltage represents a motion information of the object under measurement.