A Broadband Graphene-Based THz Coupler with Wide-Range Tunable Power-Dividing Ratios

Wu, Yongle, Qu, Meijun, Liu, Yuanan and Ghassemlooy, Zabih (2017) A Broadband Graphene-Based THz Coupler with Wide-Range Tunable Power-Dividing Ratios. Plasmonics, 12 (5). pp. 1487-1492. ISSN 1557-1955

A Broadband Graphene-Based THz Coupler-YesColor-Final-V1.pdf - Accepted Version

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Official URL: http://dx.doi.org/10.1007/s11468-016-0409-9


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.

Item Type: Article
Uncontrolled Keywords: Wide-band, Coupler, Adjustable power-dividing ratios, Graphene
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 11 Nov 2016 09:31
Last Modified: 01 Aug 2021 05:22
URI: http://nrl.northumbria.ac.uk/id/eprint/28494

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