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Open AccessArticle

Dynamically Tunable Phase Shifter with Commercial Graphene Nanoplatelets

Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Torino, Italy
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Author to whom correspondence should be addressed.
Micromachines 2020, 11(6), 600; https://doi.org/10.3390/mi11060600
Received: 14 May 2020 / Revised: 12 June 2020 / Accepted: 16 June 2020 / Published: 20 June 2020
(This article belongs to the Special Issue Graphene based Electronic Devices)
In microwave frequency band the conductivity of graphene can be varied to design a number of tunable components. A tunable phase shifter based on commercial graphene nanoplatelets is introduced. The proposed configuration consists of a microstrip line with two stubs connected with a taper. On each side of the stubs there is a gap, short circuited through a via, where the commercial graphene nanoplatelets are drop casted. By applying a DC bias voltage that alters the graphene resistance the phase of the transmitted signal through the microstrip line can be varied. In order to maximize the phase shift of the transmitted signal and minimize the insertion loss, the length of the taper and the stubs are optimized by the help of circuit model and full-wave simulations. A prototype working at 4GHz is fabricated and measured. A phase variation of 33 degrees is acquired with an amplitude variation of less than 0.4 dB. View Full-Text
Keywords: commercial graphene nanoplatelets; tunable microwave devices; phase shifter; voltage controlled microwave components commercial graphene nanoplatelets; tunable microwave devices; phase shifter; voltage controlled microwave components
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MDPI and ACS Style

Yasir, M.; Savi, P. Dynamically Tunable Phase Shifter with Commercial Graphene Nanoplatelets. Micromachines 2020, 11, 600.

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