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Wireless Bio - Signal Sensing System Using a Circular Polarized Antenna
Young-Bae Kwon,Jung-Min Park,Jung-Hwan Choi,Seong-Ook Park,Osami Ishida 한국전자파학회JEES 2005 Journal of Electromagnetic Engineering and Science Vol.5 No.3
Wireless bio-signal sensing system, which is based on the principle of Doppler radar, can measure a respiration and heart rates with a periodic movement of skin and muscle near the heart. Though the sensing monostatic system using a circulator has been studied, this bistatic system can be improved by using a circular polarized antenna which has a high isolation between transmitter and receiver. In this paper, we measured the bio-signal without the direct contact with the person. The design of each system and experimental results are discussed.