Abstract
The experimental results for the high-frequency transport characteristics (from 0.5 to 110 GHz) of graphene sheets are presented. Samples with graphene sheets of a different number of layers, as well as samples without graphene, were fabricated and compared by their room-temperature radio-frequency (RF) transmission properties. From RF two-port network experiments, the circuit parameters of resistance, inductance and capacitance were extracted using a lumped circuit model that consists of graphene, metal electrodes and contacts. Self-inductance was suppressed with decreasing number of layers, possibly due to minimized interlayer conduction or scattering. The graphene–electrode contact property shows dependence on the number of graphene layers. Our investigation may promote an understanding of the intrinsic graphene characteristics and graphene–electrode contact configuration in passive graphene devices for RF applications.
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