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http://dx.doi.org/10.15207/JKCS.2020.11.10.063

Compact Microwave Heartbeat Proximity Sensor Under Human Body Movement  

Yun, Gi-Ho (Department of Information Communication Engineering, Sungkyul University)
Publication Information
Journal of the Korea Convergence Society / v.11, no.10, 2020 , pp. 63-69 More about this Journal
Abstract
In this paper, a small microwave sensor that can be applied to a wearable device is proposed because it can detect the heartbeat signal of a human body moving irregularly at low speed. It consist of balanced microstrip radiation patches in the 2.4 GHz ISM band, self-oscillation detection circuit, and feedback circuit. Based on the theoretical development and simulation, the validity of the proposed structure was confirmed and the manufactured prototype was tested. The board size of the circuit is as small as 65mm × 85㎟, and has a low power consumption of 60mW thanks to the simple RF circuit structure. Finally heartbeat signal has been obtained from a human body moving at low speed (0.5Hz) within a linear distance of 2 to 30mm close to the sensor and a lateral distance of ±20mm.
Keywords
Heartbeat; Microwave; Balanced circuit; Radiation patch; Proximity sensor;
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