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- W2051294357 abstract "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 isolation between transmitter and receiver. As a result of achieving high isolation, irreversible vital signal due to the low isolation of conventional branch-line coupler can be detected. So, sensitivity of the system is increased drastically" @default.
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- W2051294357 date "2006-09-01" @default.
- W2051294357 modified "2023-09-27" @default.
- W2051294357 title "5.8 GHz Vital Signal Sensing Doppler radar using Isolation-improved Branch-line Coupler" @default.
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- W2051294357 doi "https://doi.org/10.1109/eurad.2006.280321" @default.
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