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Journal of the Korean Institute of Electromagnetic and Science 2005;5(3):132-139.
Wireless Bio-Signal Sensing System Using a Circular Polarized Antenna
Young-Bae Kwon1, Jung-Min Park2, Jung-Hwan Choe3, Seong-Ook Park3, Osami Ishida3
1Mobile Handset R&D Center, LG Electronics
2Telecommunication R&D Center, Samsung Electronics
3School of Engineering, Information and Communications University
Abstract
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.
Key words: Wireless, Bio-Signal, Circular Polarization, Isolation
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