A Proximity Coupling RF Sensor for Wrist Pulse Detection Based on Injection-Locked PLL

Kim, Byung-Hyun; Hong, Young Ho; An, Yong-Jun; Kim, Sang-Gyu; Lee, Heejo; Kim, Sung Woo; Hong, Seungbum; Yun, Gi-Ho; Yook, Jong‐Gwan

doi:10.1109/tmtt.2016.2549531

Cited by 32 publications

(20 citation statements)

References 42 publications

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“…From this perspective, various researchers have contributed to the technical improvement of sensing methods for physiological signals, including heart rate and respiration. Among the various sensing methods for vital signs, non-contact and non-constraint sensors based on radio frequency (RF) and microwave techniques are promising approaches [4][5][6][7]. Non-contact vital sign sensors have the distinct advantage of possible continuous monitoring without patient perception; hence, they can be used for monitoring patients at risk of sudden infant death syndrome (SIDS) or sleep apnea [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

et al. 2019

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A novel non-contact vital-sign sensing algorithm for use in cases of multiple subjects is proposed. The approach uses a 24 GHz frequency-modulated continuous-wave Doppler radar with the parametric spectral estimation method. Doppler processing and spectral estimation are concurrently implemented to detect vital signs from more than one subject, revealing excellent results. The parametric spectral estimation method is utilized to clearly identify multiple targets, making it possible to distinguish multiple targets located less than 40 cm apart, which is beyond the limit of the theoretical range resolution. Fourier transformation is used to extract phase information, and the result is combined with the spectral estimation result. To eliminate mutual interference, the range integration is performed when combining the range and phase information. By considering breathing and heartbeat periodicity, the proposed algorithm can accurately extract vital signs in real time by applying an auto-regressive algorithm. The capability of a contactless and unobtrusive vital sign measurement with a millimeter wave radar system has innumerable applications, such as remote patient monitoring, emergency surveillance, and personal health care.

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Section: Introductionmentioning

confidence: 99%

A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

et al. 2019

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“…Moreover, their sizes can be reduced due to their high operating frequencies, and they can easily be linked with commercial mobile communication systems. Because of these advantages, microwave resonators have been applied in a variety of sensing applications, such as glucose measurement 35 , 36 , biomolecular sensing 37 – 39 , gas sensing 40 , 41 , wrist pulse detection 42 – 44 , vital sign monitoring 45 – 47 , and breast tumour detection 48 , 49 . Additionally, relative humidity detection using microwave components has also been studied 50 , 51 .…”

Section: Introductionmentioning

confidence: 99%

Real-time Humidity Sensor Based on Microwave Resonator Coupled with PEDOT:PSS Conducting Polymer Film

Park

Kang

Kim

et al. 2018

Sci Rep

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A real-time humidity sensor based on a microwave resonator coupled with a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer (CP) film is proposed in this paper. The resonator is patterned on a printed circuit board and is excited by electromagnetic field coupling. To enhance the sensitivity of the sensor, the CP film is located in the area with the strongest electric field in the resonator. To investigate the performance, the proposed sensor is placed alongside a reference sensor in a humidity chamber, and humidity is injected at room temperature. The experimental results indicate that the electrical properties of the resonator with the CP film, such as the transmission coefficient (S 21) and resonance frequency, change with the relative humidity (RH). Specifically, as the RH changes from 5% to 80%, S 21 and the resonance frequency change simultaneously. Moreover, the proposed sensor exhibits great repeatability in the middle of the sensing range, which is from 40% to 60% RH. Consequently, our resonator coupled with the CP film can be used as a real-time humidity-sensing device in the microwave range, where various radio-frequency devices are in use.

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“…It is also robust to the surrounding environment such as humidity and temperature. Further details can be found in other papers we have published [19,20,24,25].…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, various sensors using microwave/radio-frequency (RF) technique have been studied for gas detection [1][2][3], biomaterial detection [4][5][6][7][8][9][10][11][12], glucose detection [13][14][15][16], vital sign monitoring [17][18][19][20], breast cancer detection [21,22], and so on and so forth. Especially, the microwave/RF technique is very useful in the material sensor and biomedical sensor owing to its nondestructive, non-obstructive, and non-contact characteristic.…”

Section: Introductionmentioning

confidence: 99%

RF interferometric wearable wrist pulse detection system

Kim¹,

Yun

et al. 2018

IET Microwaves, Antennas & Propagation

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This study presents a novel wrist pulse detection system based on the variation of transmission coefficient (S21) of coupled resonators. Radiated signal from one resonator is modulated by the wrist pulse and transmitted to the other resonator. To improve sensitivity of the system, a radio‐frequency (RF) interferometer concept is employed and its validity is mathematically analysed. Full‐wave electromagnetic simulation is conducted with the wrist phantom model to predict the transmission coefficient between resonators. The peak level of the S21 is around −10 dB and the resonance frequency shifts to higher frequency as the distance between the resonator and wrist increases. A prototype of the system is fabricated and tested to show sensitivity enhancement around the 2.4 GHz industry‐science‐medical (ISM) band. Experimental results reveal that the wrist pulse signal measured by the RF interferometer system is in exact coincidence with the reference finger sensor. Also, the sensitivity is enhanced about 23 dB with the RF interferometer system based on the measurement results.

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A Proximity Coupling RF Sensor for Wrist Pulse Detection Based on Injection-Locked PLL

Cited by 32 publications

References 42 publications

A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

Real-time Humidity Sensor Based on Microwave Resonator Coupled with PEDOT:PSS Conducting Polymer Film

RF interferometric wearable wrist pulse detection system

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