In this communication, a graphene-based radiator is designed and analyzed at THz frequency. A tilted dumbbell-shaped aperture is loaded on a graphene patch for creating degenerated orthogonal mode with 90 0 phase shift, which in turn produces circularly polarized (CP) waves. Graphene patch is placed over SiO 2 substrate. Slot loading in graphene patch shifts the frequency band due to a reduction in effective permittivity. Another important feature of the proposed antenna is to provide a tunable feature in the frequency response and axial ratio by changing the chemical potential. The proposed antenna operates from 5.85 THz to 6.05 THz. 3-dB axial ratio is obtained from 5.85 THz to 5.95 THz. Good value of gain, as well as left-handed circular polarization characteristics, makes the proposed THz antenna in biomedical applications * Availability of data and materials: Not Applicable * Funding: No funds, grants, or other support was received.

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