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The research of vital sign radars using microwave technologies grows rapidly in recent years. Such type of radars, whether using continuous-wave (CW), ultra-wideband (UWB), or other types of signals, spurred interests and new applications because of the capability of detecting respiration and heartbeat without any sensor device contacting the body. Several applications that may potentially save lives...
This paper reviews the technology development history of noncontact measurement of respiration and heartbeat using microwave techniques, and shows how the technology evolved into small micro-radars. Through understandings of its detection mechanism and advances in hardware and software, the once bulky bench-top systems can be miniaturized while achieving better performance. The evolution of system...
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