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A terahertz (THz) antenna with metallic radiator is designed to provide the monopole like radiation characteristics and ultra-wideband (UWB) response. An antenna with metallic radiator is designed to operate in the frequency range 1.78–5.48 THz. A graphene disc is applied beneath the substrate of antenna opposite to the metal radiator. The confinement of electric field in the area of graphene disc can be varied using the chemical potential of graphene (µ_c). This leads to alter the surface plasmon resonance and provides the sharp filtering characteristics in UWB response which can be tuned by altering the chemical potential of graphene. This antenna operates in the frequency range 1.78–5.39 THz for µ_c = 0 eV without filtering response. For µ_c = 0.8 eV, this antenna provides the operation over 1.67–5.64 THz with the filtered band of frequency 3.2–3.97 THz. The antenna operation is verified with the analysis …