▎ 摘　　要

The dispersion equation for waveguide modes of rectangular metal waveguides containing a dielectric buffer/graphene/air gap layered structure has been derived in the approximation of perfectly conducting metal waveguide walls. Dispersion dependences of TE0m modes for sub-terahertz frequencies were analysed against buffer layer thickness and Fermi energy level of graphene electrons. For the first time, it is demonstrated that the waveguide modes can be substantially modulated by tuning the electron Fermi energy level in graphene, especially near the regions of strong waveguide mode modifications. This enables the potential for future designs of amplitude and phase modulators for sub-THz waves in metal waveguides filled with an integrated graphene structure.