A Sub-1GHz Wearable Radar Sensor for Artery Detection

A sub-1 GHz wearable radar with non-contact and real-time detection for artery detection is presented in this paper. Healthcare and wearable requirements have been a significant topic recently. The wearable radar adopts the near-field sensing technique to detect artery wall variation. A series of radio pulse is emitted to the wrist skin by the transmitting antenna. The reflected signal with artery pulse information is then back to the receiving antenna, which will be processed by the following analog/digital processing circuits. The physiological data are digitized by using the embedded system with a 10-bit analog to digital converter. The digital bandpass filter is performed to improve overall signal-to-noise ratio. Therefore, the raw data with artery information can be obtain and further transmitted to the personal computer and cellphone by a built-in Bluetooth wireless communication module. The experimental results demonstrate that the near-field sensing technique successfully detects the wrist artery based on the proposed pulse-based sensor module.