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dc.contributor.authorHo, Tan-Hsiungen_US
dc.contributor.authorChung, Shyh-Jongen_US
dc.date.accessioned2014-12-08T15:07:58Z-
dc.date.available2014-12-08T15:07:58Z-
dc.date.issued2010-01-01en_US
dc.identifier.issn0018-9480en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TMTT.2009.2035874en_US
dc.identifier.urihttp://hdl.handle.net/11536/6271-
dc.description.abstractThis paper presents a novel Doppler radar sensor architecture with a quadrature hybrid mixer. Consisting of four branch-line couplers, two 45 degrees delay lines, and four Schottky diodes, the quadrature hybrid mixer demonstrates high transmission efficiency to pass the power from a local oscillator (LO) to an antenna without wasting received power at the oscillator port. A quadrature Doppler radar system is also implemented with the proposed quadrature hybrid mixer and defected-ground-structure LO. Compared to a conventional quadrature radar, the received power of the proposed architecture is enhanced by 3.3 dB when the LO power is 10 dBm, and is enhanced by 16.2 dB when the LO power is reduced to 0 dBm. Additionally, the improvement in received power is attributed to the improved transmission and lower receiving loss than that of the conventional ones. Capable of determining speeds lower than 0.05 km/h, which corresponds to a 1-Hz Doppler shift. The proposed Doppler radar architecture can identify the direction of the displacement due to use of the quadrature technique.en_US
dc.language.isoen_USen_US
dc.subjectDoppler radaren_US
dc.subjectquadrature mixeren_US
dc.subjectquadrature radaren_US
dc.subjectvelocity measurementen_US
dc.titleDesign and Measurement of a Doppler Radar With New Quadrature Hybrid Mixer for Vehicle Applicationsen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TMTT.2009.2035874en_US
dc.identifier.journalIEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUESen_US
dc.citation.volume58en_US
dc.citation.issue1en_US
dc.citation.spage1en_US
dc.citation.epage8en_US
dc.contributor.department電信工程研究所zh_TW
dc.contributor.departmentInstitute of Communications Engineeringen_US
dc.identifier.wosnumberWOS:000273609400001-
dc.citation.woscount3-
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