Reforming the Capacitive Edges in the Plasmonic Radiator of THz Antenna Using Graphene for Controllable Notched Band

This research work reports a technique using which the antenna response can be reformed either with or without band notch characteristics. A metallic antenna is implemented for attaining the wideband response in terahertz (THz) frequency covering 8.55–12.4 THz. The radiator is inscribed with the slots in it for attaining the band notch feature in antenna in the range 8.62–9.53 THz over the covering frequency range of 8.15–14.56 THz. The created slots in the antenna radiator create the capacitive effect leading to the filtering attributes. Slots are filled with the graphene material for acquiring the reformation capability in antenna. The surface conductivity of graphene is set at the higher value for removal of the formed capacitive edges and hence the field confinement from antenna radiator which mitigates the created filtering attributes. The lower value of the surface conductivity of graphene leads to reform the capacitive effect and hence the field confinement and the filtering characteristics. The antenna provides the gain in the range of 4–7 dBi with the radiation efficiency of more than 90%.