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dc.contributor.authorChi, Pei-Lingen_US
dc.contributor.authorHsu, Ting-Chenen_US
dc.date.accessioned2018-08-21T05:54:23Z-
dc.date.available2018-08-21T05:54:23Z-
dc.date.issued2017-08-01en_US
dc.identifier.issn0018-9480en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TMTT.2017.2668412en_US
dc.identifier.urihttp://hdl.handle.net/11536/145893-
dc.description.abstractThis paper proposes a varactor-based coupler structure that allows for reconfigurable operating frequency, power-dividing ratio, and coupler to/from crossover responses. Particularly, this coupler can theoretically realize perfect impedance matching and port isolation at all tuning states. The coupler analysis, design equations, and design graphs were conducted, given, and discussed in detail. For demonstration purposes, two prototypes were experimentally developed and characterized. The first quadrature coupler demonstrates a frequency-tuning range from 0.632 to 1.5 GHz with a constant power-dividing ratio of -3 dB, <2.3 degrees phase imbalance, >20-dB isolation, and >14-dB return loss. In the second prototype, for the phase error <6.7 degrees, isolation and return loss >19 dB, the power-dividing ratio was tuned from -6.4 to 20.5 dB at 1 GHz, yielding a 26.9-dB tuning range and crossover characteristics at low bias voltages. Measured and simulated results are in good agreement.en_US
dc.language.isoen_USen_US
dc.subjectCrossoveren_US
dc.subjectquadrature coupleren_US
dc.subjectreconfigurableen_US
dc.subjectvaractoren_US
dc.titleHighly Reconfigurable Quadrature Coupler With Ideal Impedance Matching and Port Isolationen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TMTT.2017.2668412en_US
dc.identifier.journalIEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUESen_US
dc.citation.volume65en_US
dc.citation.spage2930en_US
dc.citation.epage2941en_US
dc.contributor.department電機工程學系zh_TW
dc.contributor.departmentDepartment of Electrical and Computer Engineeringen_US
dc.identifier.wosnumberWOS:000407370900029en_US
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