The invention provides a novel substrate integrated
ridge waveguide structure, comprising: a
dielectric substrate unit, comprising a lower
dielectric substrate and an upper
dielectric substrate arranged on the lower
dielectric substrate, wherein the dielectric constant of the upper
dielectric substrate is different from that of the lower
dielectric substrate. A suspended
metal column embedded in the upper dielectric substrate along a direction perpendicular to the dielectric substrate unit and periodically arranged on a centerline in the longitudinal direction of the upper dielectric substrate; And a
metal strip arranged at the bottom of the suspended
metal column. The novel substrate integrated
ridge waveguide is composed of two dielectric substrates with different dielectric constants. The gap between the lower surface of the suspended metal column embedded in the structure and the lower surface of the dielectric substrate unit forms the
ridge capacitance, which reduces the
cutoff frequency of the main mode. In addition, the area between the
electrode plates is increased by the
metal strips arranged at the bottom of the suspended metal column, so that the ridge
capacitance valueis increased, the
cutoff frequency of the main mode is further reduced, and the working bandwidth of the obtained main mode is greatly improved.