A Sinusoidally-Modulated Leaky-Wave Antenna With Gapped Graphene Ribbons

This letter proposes a new sinusoidally-modulated graphene leaky-wave antenna for beam scanning at terahertz (THz) with only one biasing voltage required. The antenna consists of a number of dc-gated graphene ribbons on a grounded dielectric substrate. The graphene ribbons are nonuniformly gapped to realize a sinusoidally-modulated reactance surface to support the leaky-wave operation. The analysis shows that the beam angle and leakage rate can be controlled by the gate voltage, indicating a good reconfigurability. The simulated and analytical results agree well with each other that not only validate the design method but also show that the new antenna is promising for graphene-based THz wireless systems.