Journal
MICROMACHINES
Volume 14, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/mi14101877
Keywords
graphene; thick films; tunable devices; phase shifter
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In this paper, an enhanced tunable microwave phase shifter is proposed, which achieves phase variation by adjusting the conductivity of graphene.
In this work, an enhanced tunable microwave phase shifter is presented. The phase shifter consists of three short circuited stubs and a tapered line. The stubs are connected to graphene pads. Graphene's tunable conductivity is varied by a DC voltage. This in turn causes a reactance variation at the input of the tapered line, which causes a phase variation. The physical parameters of the stubs are optimized for a maximum reactance variation by the help of analytical models, circuit and full wave simulations. Measurements of an optimized prototype are performed and a dynamic phase variation of 59 circle is obtained with an amplitude variation of less than 1 dB.
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