Dual band circularly polarized reconfigurable asymmetrical dumbbell shaped graphene-silicon ceramic based hybrid antenna for THz application

In this communication, dual-band circularly polarized radiator is structured and investigated in THz regime. The unique properties of proposed radiator are: (1) dual band circularly polarized aerial is designed in THz regime; (2) application of graphene layer over ceramic makes the radiator reconfigurable in terms of both frequency range and axial ratio; and (3) asymmetrical dumbbell shape helps to create dual radiating mode i.e. HEM11 delta and HEM12 delta mode. For verification, optimized outcome obtained from Ansys HFSS is compared with CST-MWS. There is good agreement between them. The designed radiator works well between 2.4 THz-3.0 THz and 4.4 THz-5.15 THz. The value of axial ratio below 3-dB is achieved between 2.6 THz-2.8 THz and 4.6 THz-4.8 THz, respectively. Broadsided radiation patterns and good gain characteristics create the designed aerial suitable for different wireless applications in the optical domain.