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Modern microwave radar technologies and systems are taking important roles in healthcare, security, and human-machine interface by remote sensing of human life activities. This paper first reviews the developments in the past decade on the sensing front-end, transponder tag, and leveraging of other wireless infrastructure such as Wi-Fi. Based on the state-of-the-art engineering technologies, several emerging applications will then be studied, including continuous authentication, behaviordoi:10.1109/jmw.2020.3030722 fatcat:p7ys76vc6nenzomqmvtarzmloq