In order to solve the problem of the narrow bandwidth of the substrate integrated waveguide, a new type of ridge substrate integrated waveguide (RSIW) is proposed. Based on the traditional RSIW, the structure is composed of two dielectric layers with different permittivity, and there are two rows of air holes arranged periodically on the both sides of the structure. Simulation results demonstrate that the single-mode working bandwidth of the proposed structure is up to10.88 GHz, which is 57 % and 18.8 % higher than that of RSIW1 and RSIW2. Moreover, the B value of the proposed structure is 4.42, and the structure exhibits good transmission characteristics over the whole passband, which can be suitable for applications covering the entire ultra-wideband. The design provides a reference for solving the narrow bandwidth of the substrate integrated waveguide and forming a compact broadband interconnect.