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

• DOI: 10.1007/s11082-022-04000-3
• Publication Date: 2022-07-25T14:03:58Z
• Authors: Nagesh Kallollu N...; Manju Ramrao Bhosle; Krishna Kanth Var...; Ajay Kumar Dwivedi
• Keywords: Dumbbell; Patch antenna; Radiator (engine cooling); Axial ratio

Abstract 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 900 phase shift, which in turn produces circularly polarized (CP) waves. Graphene patch is placed over SiO2 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