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Theory of the suspended graphene varactor
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Image of FIG. 1.
FIG. 1.

(a) A 3D schematic of the proposed suspended variable capacitor. (b) An electric circuit model accounting for resistive losses, with R being the total graphene membrane resistance, C being the total graphene-plate capacitance, and n the number of discrete elements used to approximate the distributed system, with a continuum model reached as . (c) An array of graphene capacitors can be used to increase the total capacitance for a given capacitance per unit length.

Image of FIG. 2.
FIG. 2.

The relative change in capacitance versus DC bias voltage for a capacitor of length and a trench height . An approximately linear response is observed over a 40% tuning range, with a total tuning range of 76% at pull-in.

Image of FIG. 3.
FIG. 3.

The electric quality factor Q versus frequency for a graphene varactor of length and height . The quality factor drops to unity at high frequency and high sheet resistance, where the varactor acts as a lossy transmission line.

Image of FIG. 4.
FIG. 4.

The trench aspect ratio, L/h is determined by the design metric and the available graphene sheet resistance .

Image of FIG. 5.
FIG. 5.

The pull-in voltage dependence on trench height h with the trench aspect ratio L/h indicated as a parameter.


Generic image for table
Table I.

Comparison of variable capacitor properties.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Theory of the suspended graphene varactor