A compact wireless 2.4 GHz RF sensor placed 20 mm away from a human body can accurately detect heartbeat and respiration signals by utilizing input impedance variation.
A novel 2.4 GHz wireless RF sensor can accurately detect heartbeat and respiration signals from 20 mm away without contact.
This paper describes a compact and novel wireless vital sign sensor at 2.4 GHz that can detect heartbeat and respiration signals. The oscillator circuit incorporates a planar resonator, which functions as a series feedback element as well as a near-field radiator. The periodic movement of a human body during aerobic exercise could cause an input impedance variation of the radiator within near-field range. This variation results in a corresponding change in the oscillation frequency and this change has been utilized for the sensing of human vital signs. In addition, a surface acoustic wave (SAW) filter and power detector have been used to increase the system sensitivity and to transform the frequency variation into a voltage waveform. The experimental results show that the proposed sensor placed 20 mm away from a human body can detect the vital signs very accurately.
Kim et al. (Sat,) conducted a other in Vital sign monitoring. Wireless RF sensor at 2.4 GHz was evaluated on Detection of heartbeat and respiration signals. A compact wireless 2.4 GHz RF sensor placed 20 mm away from a human body can accurately detect heartbeat and respiration signals by utilizing input impedance variation.
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