Multitunable microwave system for touchless heartbeat detection and heart rate variability extraction

Abstract

This work proposes a contactless multitunable microwave measurement scheme for heartbeat detection. Our system is based on simplicity and the ability of tuning two parameters: frequency and power. Measurements are performed at 2.4, 5.8, 10, 16, and 60 GHz. Operating at 2.4 GHz, the heartbeat signal is detected at different output power levels (from À2 down to À27 dBm). The heart rate variability is extracted for all the measurements.

Reconfigurable Concurrent dual-band Low Noise Amplifier for noninvasive vital sign detection applications

“…using a concurrent dual-band system operating simultaneously at lower and higher frequencies, the advantages of increased detection sensitivity with lower noise level can be obtained and demonstrated in [1] using microstrip technology. In [10], a tunable microwave system for touchless heartbeat detection and heart rate variability extraction is proposed in which two parameters are tuned: frequency and power. Also, it is demonstrated that using the multi-tunable system, the detection sensitivity of the human vital signs can be improved.…”

Ultra-Wide Patch Antenna Array Design at 60 GHz Band for Remote Vital Sign Monitoring with Doppler Radar Principle

“…(6) in mind, the amplitude of the received BR and HR signal is comprised of the product of J 0 (X) and J 1 (X) and the argument X is controlled by m b , m h and λ. For our current case of VSM at 60 GHz band, λ is around 4.65 mm, m b = (8 − 12)mm and m r = (0.2 − 0.5)mm for a person at rest with normal breathing [42]. Figure 9b-d shows the phase amplitude variations of R(t) signal for various combination of m b and m r with BR and HR in combined, only BR and HR, respectively.…”

ECG vs. single-antenna system for heartbeat activity detection

“…An extension of the system using two antennas and operating at 60 GHz is described in [15,16]. The measurements procedure starts by sending a continuous wave signal at the desired frequency.…”

“…Since the heartbeat rate is based on the detection of the signal peaks, a smoothing method is applied in order to reduce the number of surrounding peaks. This method is based on the Newton relation, which is described in [16,17].…”