A5100753599- Non-Invasive Vital Sign Monitoring
- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- ECG Monitoring and Analysis
- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Gas Sensing Nanomaterials and Sensors
- GaN-based semiconductor devices and materials
- Hemodynamic Monitoring and Therapy
- Advancements in PLL and VCO Technologies
- Advanced Power Amplifier Design
- Wireless Body Area Networks
- Analytical Chemistry and Sensors
- Electromagnetic Compatibility and Noise Suppression
- Antenna Design and Analysis
- Healthcare Technology and Patient Monitoring
- ZnO doping and properties
- Acoustic Wave Resonator Technologies
- Heart Rate Variability and Autonomic Control
- Antenna Design and Optimization
- Ga2O3 and related materials
- Particle physics theoretical and experimental studies
- Microwave Imaging and Scattering Analysis
- Semiconductor materials and devices
- Semiconductor Lasers and Optical Devices
Fujian Electric Power Survey & Design Institute
2024
Tufts University
2023
China Southern Power Grid (China)
2023
University of Florida
2013-2022
National Yang Ming Chiao Tung University
2007-2022
Control Systems Research (United States)
2016
National Chung Cheng University
2016
École Polytechnique Fédérale de Lausanne
2016
Massachusetts Institute of Technology
2016
KU Leuven
2014-2015
Direct-conversion microwave Doppler-radar transceivers have been fully integrated in 0.25-/spl mu/m silicon CMOS and BiCMOS technologies. These chips, operating at 1.6 2.4 GHz, detected movement due to heartbeat respiration 50 cm from the subject, which may be useful infant adult apnea monitoring. The range-correlation effect on residual phase noise is a critical factor when detecting small fluctuations with high-phase-noise on-chip oscillator. Phase-noise reduction range correlation was...
The sensitivity for detecting hydrogen with multiple ZnO nanorods is found to be greatly enhanced by sputter-depositing clusters of Pd on the surface. resulting structures show a change in room- temperature resistance upon exposure concentrations N2 10–500ppm approximately factor 5 larger than without Pd. Pd-coated detected down <10ppm, relative responses >2.6% at 10ppm and >4.2% 500ppm H2 after 10min exposure. There was no response room O2. Approximately 95% initial...
In this paper, a high-power high-efficiency wireless-power-transfer system using the class-E operation for transmitter via inductive coupling has been designed and fabricated proposed design approach. The requires no complex external control but relies on its natural impedance response to achieve desired power-delivery profile across wide range of load resistances while maintaining high efficiency prevent any heating issues. consists multichannels with independent gate drive power delivery....
The complex signal demodulation and the arctangent are studied for random body movement cancellation in quadrature Doppler radar noncontact vital sign detection. This technique can be used sleep apnea monitor, lie detector, baby monitor to eliminate false alarm caused by movement. It is shown that if dc offset of baseband accurately calibrated, both techniques cancellation. While less likely affected a offset, has advantage eliminating harmonic intermodulation interference at high carrier...
Wireless power has been a topic of interest from the early 20th century until today. This paper traces history wireless transmission starting with Nikola Tesla, continuing on to experiments beaming using microwaves. Examining difference between near-field and far-field techniques, this continues into modern times explaining why technique is more suitable for consumer electronic devices exploring via magnetic field. Examples short-range midrange systems are explored.
ABSTRACT We present the JWST cycle 1 53.8 h medium program FRESCO, short for ‘First Reionization Epoch Spectroscopically Complete Observations’. FRESCO covers 62 arcmin2 in each of two GOODS/CANDELS fields a total area 124 exploiting JWST’s powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2 deep NIRCam/grism observations with F444W filter, yields unprecedented spectra R ∼ 1600 covering 3.8–5.0 µm most galaxies NIRCam field view. This setup enables...
There is renewed emphasis on development of robust solid-state sensors capable uncooled operation in harsh environments. The should be detecting chemical, gas, biological or radiation releases as well sending signals to central monitoring locations. We discuss the advances use GaN-based for these applications. AlGaN/GaN high electron mobility transistors (HEMTs) show a strong dependence source/drain current piezoelectric polarization-induced two-dimensional gas (2DEG). Furthermore,...
A comparison is made of the sensitivities for detecting hydrogen with Pt-coated single ZnO nanorods and thin films various thicknesses (20–350 nm). The show a current response approximately factor 3 larger at room temperature upon exposure to 500ppmH2 in N2 than ZnO. power consumption both types sensors can be very small (in nW range) when using discontinuous coatings Pt. Once Pt coating becomes continuous, required operate increases μW range. optimum film thickness under our conditions was...
A Ka-band transceiver using low-power double-sideband transmission to detect human heartbeat and respiration signals is demonstrated. The electromagnetic wave offers higher detection sensitivity on small movement due its shorter wavelength. Indirect-conversion receiver architecture chosen reduce the dc offset 1/f noise that can degrade signal-to-noise ratio accuracy. Furthermore, at transmitter output be in quadrature by choosing a proper frequency separation relieve severe null point...
A microwave radio for Doppler radar sensing of vital signs is described. This was developed using custom DCS1800/PCS1900 base station RFICs. It transmits a single tone signal, demodulates the reflected and outputs baseband signal. If object that reflects signal has periodic motion, magnitude output directly proportional to displacement object. When off person's chest, this with appropriate filters can detect heart respiration rates from distance as large one meter target.
The accuracy of a Ka-band physiological movement detector was tested and compared for measurements from four different body orientations at five distances. A rigorous spectral analysis approach is developed when previously adopted small-angle approximation model not applicable. This theory analyzes in detail the harmonics observed phase-modulated Doppler radar, explaining reason better heart-rate detected back body. It also explains advantage double-sideband transmission avoiding null point...
Wireless power transfer is demonstrated mathematically and experimentally for M primary coils coupled to N secondary coils. Using multiple in parallel has advantages over a single coil. First, the reduced inductance of transmitting makes amplifier less sensitive component variations. Second, with receiving coils, delivery an individual receiver changes loads attached other By using 16 cm by 18 6 8 coil, going from 1:2 coupling 2:2 coupling, we show increase received 1.8 9.5 W, only small...
The development of active integrated antennas is reviewed in this paper. circuit structures different types are discussed. Various circuits integrating solid state devices and low-profile passive antenna elements demonstrated. applications quasi-optical power combining arrays beam-scanning phased reviewed. By using the modern MIC MMIC fabrication technology, compact, light-weight, low-cost realized. In addition, nonlinear electromagnetic simulations discussed.< <ETX...
In this paper, we present a fast solution to build Doppler radar system for noncontact vital sign detection (VSD) using instruments that are generally equipped in radio-frequency and communication laboratories. This paper demonstrates the feasibility of conducting research on VSD ordinary The is designed with heterodyne digital quadrature demodulation architecture helps mitigate channel imbalance eliminate complicated dc offset calibration required arctangent demodulation. Moreover, its...
A complex signal demodulation technique is proposed to eliminate the null detection point problem in non-contact vital sign detection. This robust against DC offset direct conversion system. Based on demodulation, a random body movement cancellation developed cancel out strong noise caused by monitoring. Multiple transceivers and antennas with polarization frequency multiplexing are used detect signals from different orientations. The due cancelled based patterns of desired undesired...
We consider using a Doppler radar for accurate noncontact vital sign detection. The first captures and downconverts the wireless signal that is phase modulated by physiological movements, then identifies human heartbeat respiration rates processing baseband signal. When nonlinear modulation employed to monitor signs without contact, one of challenges we encounter presence undesired harmonic terms intermodulations other than sinusoids interest. A spectral estimation algorithm needed...
This paper presents the first flip-chip-packaged and fully integrated Doppler micro-radar in 90-nm CMOS for noncontact vital-sign vibration detection. The use of a smaller wavelength compared with previous works achieves highly compact system portable devices, radar design considerations at 60 GHz are discussed from both circuits points view. 60-GHz core (0.73 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) provides 36-dB peak...
The fast acquisition of heart rate (HR) is a challenge in noncontact vital sign detection using Doppler radar system. Most the previous studies use long-period time windows to guarantee sufficient frequency spectrum resolution for HR measurement peak searching method on spectrum. For HR, length window less than 5 s and accuracy significantly degraded due insufficient resolution. complex signal demodulation (CSD), measuring variation becomes difficult job respiration harmonic interference In...
Random body movement (RBM) is one of the most challenging issues in non-contact vital sign detection using Doppler radar technique. The large and irregular displacement human could corrupt signal significantly degrade accuracy detection. Even respiration rate (RR) sometimes cannot be measured accurately under RBM. In this paper, characteristic frequency spectrum motion (the modulation effect) analyzed. Based on that effect, an RR measurement method one-dimensional (1-D) developed only...
The fast detection of heart rate (HR) is challenging when using the noncontact continuous-wave (CW) Doppler radar. Applying Fourier transform (FT) to baseband signal analysis, accuracy degraded due insufficient frequency resolution if less than 5-s time window realize detection. Moreover, respiratory harmonic peak might be incorrectly picked as heartbeat its magnitude larger in spectrum. In this paper, a wavelet-transform-based data-length-variation technique proposed HR. With technique, HR...
Advances and updates in medical applications utilizing microwave techniques technologies are reviewed this paper. The article aims to provide an overview of enablers for their recent progress. emphasis focuses on the microwaves, following order, 1) signal data communication implants wearables through human body, 2) electromagnetic energy transfer tissues, 3) noninvasive, remote or <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i>...
We have demonstrated the first Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (Gd ) insulated gate n-channel enhancement-mode In/sub 0.53/Ga/sub 0.47/As MOSFET's on InP semi-insulating substrate. was electron beam deposited from a high purity single crystal xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> Gd O/sub 12/ source. The source and drain regions of device were...