5.8 GHz vital signal sensing Doppler radar using isolation-improved branch-line coupler

Sang Gyu Kim, Hyun Kim, Yongshik Lee, Il Suek Kho, Jong Gwan Yook

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)

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 feed-forward 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.

Original languageEnglish
Title of host publicationProceedings of the 3rd European Radar Conference, EuRAD 2006
PublisherIEEE Computer Society
Pages249-252
Number of pages4
ISBN (Print)2960055179, 9782960055177
DOIs
Publication statusPublished - 2006 Jan 1
Event3rd European Radar Conference, EuRAD 2006 - Manchester, United Kingdom
Duration: 2006 Sep 132006 Sep 15

Publication series

NameProceedings of the 3rd European Radar Conference, EuRAD 2006

Other

Other3rd European Radar Conference, EuRAD 2006
CountryUnited Kingdom
CityManchester
Period06/9/1306/9/15

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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