Design of a graphene-based ridge gap waveguide coupler for THz applications

Ridge gap waveguide is one of the new technologies in the field of waveguides. Their advantages include being planar, low cost of construction, shielding by metal without the need for problems related to packaging, the formation of a narrow gap enclosed between two metal plates, realization of the texture on one of the metal plates, and lower losses. These structures have no mechanical connection. While electric currents must flow in them. In this article, two graphene-based ridge gap waveguide coupler structures are presented. The designed structures are used in the THz band. By using graphene in the THz frequency band, frequency reconfigurable can be achieved. The chemical potential of both the designed ridge gap waveguide coupler is considered to be 0.6 eV. S-parameters curves, phase difference diagrams, and e-field distributions are reported for two graphene-based ridge gap waveguide couplers.