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a broadband graphene-based thz coupler with wide-range tunable power-dividing ratios
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نویسنده
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wu yongle ,qu meijun ,liu yuanan ,ghassemlooy z.
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منبع
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plasmonics - 2017 - دوره : 12 - شماره : 5 - صفحه:1487 -1492
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چکیده
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A wide-band coupler based on the graphene with inherent dc-block function and adjustable power-dividing ratios is proposed. this coupler uses three sections of the two-line coupled lines, four sections of the three-line coupled lines, and four graphene stubs (two u-shaped stubs and two rectangular stubs). the graphene stubs allow the coupler to own dynamic surface conductivity, which could be tuned by altering the chemical potentials. the tunable power-dividing ratios could be achieved by varying the chemical potentials applied to the u-shaped graphene stubs and the rectangular graphene elements, respectively. in addition, the widths of two-line coupled lines in the proposed coupler are analyzed to affect the power-dividing ratios in detail. finally, the power-dividing ratios of the proposed coupler have a variation range from 5.4 to 9.56 db at 1.75 thz with a flat 90° phase shift. the minimum −10 db impedance bandwidth is 44 % from 1.47 to 2.3 thz, thus indicating a wide-band performance.
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کلیدواژه
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wide-band ,coupler ,adjustable power-dividing ratios ,graphene
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آدرس
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beijing university of posts and telecommunications, school of electronic engineering, beijing key laboratory of work safety intelligent monitoring, china, beijing university of posts and telecommunications, school of information and communication engineering, beijing key laboratory of network system architecture and convergence, china, beijing university of posts and telecommunications, school of electronic engineering, beijing key laboratory of work safety intelligent monitoring, china, northumbria university, faculty of engineering and environment, optical communications research group, ncrlab, uk
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Authors
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