Design of graphene frequency reconfigurable antenna in terahertz band

Based on the unique advantages of graphene in terahertz band, such as impedance matching and electrical controllable characteristics, a graphene frequency reconfigurable microstrip antenna in terahertz band is proposed. The antenna inserts two pieces of graphene in the slot of the bottom plate, and controls the conductivity of graphene by adjusting the size of the graphene chemical potential. Under different chemical potential, the graphene block can be set into two states of medium and conductor, and the microstrip antenna can be set into four modes. The simulation results show that the resonant frequency of the antenna is in the range of 2.472~2.652THz under the four states, and the reflection coefficients are all less than -20dB. Meanwhile, the antenna has good radiation performance in the E and H- plane antennas. The chemical potential of a single graphene was randomly selected with 5 values ranging from 0.1eV to 4eV and simulated. The fine-tuning mode can achieve the frequency tunable function of 208GHz.