High frequency characteristics of graphene layers

The experimental results for high-frequency characteristics (from 2 to 20 GHz) of graphene films are presented. Samples with multi-layer graphene were fabricated and characterized from curve-fitting experimental results with values simulated using an electromagnetic simulator. From RF two-port network experiments, the circuit parameters of capacitance, resistance and inductance were extracted using a physics-based RLC lumped element circuit model that consists of contact pads and graphene electrodes using a commercially available microwave circuit simulator. The proposed model reproduced all the measured characteristics, and the component values which gave the best fit with the measurements were successfully extracted from the model. Our findings demonstrate that the measured RF performance of multilayer graphene (MLG) -based transmission lines gave good agreement with simulation predicted by a lumped element RLC model.