Design of an ultra-compact reconfigurable IDC graphene-based SIW antenna in THz band with RHCP

A substrate-integrated waveguide antenna is proposed in the presented article. Graphene is used in the structure of the designed substrate-integrated waveguide antenna. The application of the desired structure is in the THz frequency band. The frequency reconfigurable of graphene has been used in this study. The operating frequency of a substrate-integrated waveguide antenna is 2.3 THz. The structure of the patch antenna is located on a silicon dioxide substrate. Inter-digital capacitor (IDC) slots are used in the designed antenna structure. The form of these slots is in the form of a ramp. The application of IDCs is very effective in the miniaturization of the structure. Therefore, the structure is very compact. In the frequency range of 2-3 THz, the reconfigurable IDC graphene-based SIW antenna has suitable conditions from the matching approach and polarization point of view. In the working range, the S11 is reported to be below the - 10 dB level. The axial ratio is 0.943 dB at the central frequency. The radiation efficiency is reported at 78.7%. The designed antenna provides right-hand circular polarization. The results of 2D and 3D radiation patterns are shown. Surface current distribution, H-field distribution, and E-field distribution of an ultra-compact reconfigurable IDC graphene-based substrate-integrated waveguide antenna are presented.