US Patent No. 10,281,561


Patent No. 10,281,561
Issue Date May 07, 2019
Title Quadrature Self-injection-locked Radar
Inventorship Fu-Kang Wang, Kaohsiung (TW)
Tzyy-Sheng Horng, Kaohsiung (TW)
Mu-Cyun Tang, Kaohsiung (TW)

Claim of US Patent No. 10,281,561

1. A quadrature self-injection-locked radar comprising:a self-injection-locked (SIL) loop including a voltage-controlled oscillator (VCO), a phase shifter and a transceiver antenna, wherein the VCO outputs an oscillation signal, the phase shifter adjusts a phase of the oscillation signal to operate in two phase modes, and the transceiver antenna radiates the oscillation signal to a subject, wherein the oscillation signal reflected from the subject is received by the transceiver antenna and transmitted to the VCO for bringing the VCO to a self-injection-locked (SIL) state to generate a first self-injection-locked (SIL) signal and a second self-injection-locked (SIL) signal;
a frequency demodulator for receiving the first and second SIL signals, wherein the frequency demodulator demodulates the first and second SIL signals in frequency to obtain a first frequency demodulation signal and a second frequency demodulation signal; and
a signal processor for receiving and computing the first and second frequency demodulation signals to obtain a displacement signal of the subject.