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(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.
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.
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.
The trench aspect ratio, L/h is determined by the design metric and the available graphene sheet resistance .
The pull-in voltage dependence on trench height h with the trench aspect ratio L/h indicated as a parameter.
Comparison of variable capacitor properties.
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