Full-modal-waveguide-structure-based substrate-integrated waveguide directional coupler

The invention, which belongs to the technical field of integrated waveguide, puts forward a full-modal-waveguide-structure-based substrate-integrated waveguide directional coupler. The substrate-integrated waveguide directional coupler comprises a first layer dielectric substrate, a second layer dielectric substrate, and a port. An upper metal layer is arranged on the upper surface of the first layer dielectric substrate; and a coupling metal layer is arranged on the lower surface of the first layer dielectric substrate. The upper metal layer includes an upper metal layer feeding structure and a waveguide upper surface; and coupling holes are formed in the coupling metal layer. The upper surface of the second layer dielectric substrate is in contact with the coupling metal layer arranged at the lower surface of the first layer dielectric substrate. A lower metal layer is arranged on the lower surface of the second layer dielectric substrate and includes a lower metal layer feeding structure and a waveguide lo