Circularly polarized tunable graphene-patch over SiO2 substrate for THz applications

In this communication, a graphene-based radiator is designed and analyzed at THz frequency. A tilted dumbbell-shaped aperture loaded on graphene patch for creating degenerated orthogonal mode with 90° phase shift, which in turn produces circularly polarized (CP) waves. Graphene placed over SiO2 substrate. Slot loading shifts the frequency band due to reduction effective permittivity. Another important feature of proposed antenna provide tunable response axial ratio by changing chemical potential. The operates from 5.85 6.05 THz. 3-dB obtained 5.95 Good value gain, as well left-handed circular polarization characteristics, makes sensing applications.