A Graphene Loaded THz Patch Antenna with Tunable Frequency

This paper proposes a graphene loaded microstrip patch antenna with tunable frequency at THz. The antenna consists of a rectangular patch with a graphene pad connected to the radiating edge of antenna, and a broadband DC bias circuit to apply bias voltage to graphene pad. Meanwhile, the DC bias circuit can achieve open circuit to high frequency signal, which reduces the influence of DC bias circuit on the input impedance of the antenna. The surface impedance of graphene can be dynamically controlled by changing the applied bias voltage, thus the input impedance of the antenna can be adjusted. Then the tunable frequency of the antenna is realized. A prototype antenna operating at the frequency of 300GHz. The proposed design can achieve linear frequency tunability in the range below the initial operating frequency.