TY - GEN
T1 - A W-band Self-Injection-Locked Vital Sign Radar Sensor with On-Chip SIW Monopole Antenna in 0.1-µm GaAs pHEMT
AU - Gao, Donglin
AU - Li, Shuping
AU - Chen, Austin Ying Kuang
AU - Michael Wu, Chung Tse
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - This paper presents a highly sensitive and low-power W-band (75-110 GHz) vital sign radar sensor with an integrated monopole antenna using a 0.1-µm GaAs pHEMT technology. The proposed self-injection-locked (SIL) radar sensor consists of an 85.09-GHz single-transistor oscillator, a 4-dB directional coupler, and a -6.7-dBi substrate-integrated-waveguide (SIW) monopole antenna while consuming only 56 mW from a 2-V supply. The frequency-modulated signal at millimeter-wave (mm-wave) frequency is extracted using the directional coupler and downconverted via an external harmonic mixer to the baseband (1 MHz) for subsequent signal processing and data acquisition. To estimate the detected vital sign signal, a two-step Fourier analysis technique based on non-overlapped Short-Time Fourier Transform (STFT) and Fast Fourier Transform (FFT) is adopted. The experimental results show that the proposed SIL radar sensor can accurately detect vital signs at a distance up to 0.9 m while achieving an excellent agreement with the ground truth.
AB - This paper presents a highly sensitive and low-power W-band (75-110 GHz) vital sign radar sensor with an integrated monopole antenna using a 0.1-µm GaAs pHEMT technology. The proposed self-injection-locked (SIL) radar sensor consists of an 85.09-GHz single-transistor oscillator, a 4-dB directional coupler, and a -6.7-dBi substrate-integrated-waveguide (SIW) monopole antenna while consuming only 56 mW from a 2-V supply. The frequency-modulated signal at millimeter-wave (mm-wave) frequency is extracted using the directional coupler and downconverted via an external harmonic mixer to the baseband (1 MHz) for subsequent signal processing and data acquisition. To estimate the detected vital sign signal, a two-step Fourier analysis technique based on non-overlapped Short-Time Fourier Transform (STFT) and Fast Fourier Transform (FFT) is adopted. The experimental results show that the proposed SIL radar sensor can accurately detect vital signs at a distance up to 0.9 m while achieving an excellent agreement with the ground truth.
KW - GaAs pHEMT
KW - W-band
KW - self-injection-locked (SIL) radar
KW - substrate-integrated-waveguide (SIW)
KW - vital sign detection
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U2 - 10.1109/IMS37964.2023.10188088
DO - 10.1109/IMS37964.2023.10188088
M3 - Conference contribution
AN - SCOPUS:85168544823
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 871
EP - 874
BT - 2023 IEEE/MTT-S International Microwave Symposium, IMS 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE/MTT-S International Microwave Symposium, IMS 2023
Y2 - 11 June 2023 through 16 June 2023
ER -