▎ 摘　　要

We present the modeling and measurements of microwave propagation in a coplanar waveguide over graphene in the range of frequencies 40 MHz-110 GHz, which suggest that graphene could work well in a very large bandwidth. Graphene is acting as a natural matching device because its equivalent resistance at these frequencies is able to vary more than 75% when DC biases are applied in the range -4 V to 4 V on the graphene waveguide. (C) 2011 American Institute of Physics. [doi:10.1063/1.3615289]