5.8 GHz Vital Signal Sensing Doppler radar using Isolation-improved Branch-line Coupler

  title={5.8 GHz Vital Signal Sensing Doppler radar using Isolation-improved Branch-line Coupler},
  author={Sang-Gyu Kim and Hyun Jae Kim and Yongshik Lee and I. Eng Kho and Jong-Gwan Yook},
  journal={2006 European Radar Conference},
5.8 GHz Doppler radar which is wireless sensor to collect the respiration and heart rate using feed-forward type branch-line coupler is developed. Even though the wireless sensing systems using a circulator or branch-line coupler have been developed, these systems have low sensitivity because of low isolation and bulky system due to Tx/Rx two independent signal paths. In this paper, proposed Doppler radar has improved the isolation by using feedforward type branch-line coupler, which has -55 dB… CONTINUE READING
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