X-band Radar System for Detecting Heart and Respiration Rates

This paper proposes an X-band Doppler radar system to detect heart and respiration of human far away. Through the idea of a reverse sense of rotation when the reflecting surface is perfectly conducting, it is shown that the detecting property of the system can be effectively improved by using antennas that have a reverse polarization. This bistatic radar system can be used in non-invasively sensing bio signals such as respiration and heart rates with the periodic movement of skin and muscle near the heart. Keywords-heart rate; X-band; array antenna; polarization;