Radar waveguide antenna

The radar waveguide antenna comprises an upper cover plate layer, a lower bottom plate layer, a microstrip structure, a metal ridge structure and a pin periodic structure, the upper cover plate layer is provided with a dielectric layer and a metal layer fixedly arranged on the front face of the dielectric layer, the lower bottom plate layer is parallel to the upper cover plate layer, and the lower bottom plate layer and the back face of the dielectric layer are oppositely arranged at intervals; the microstrip structure is arranged on the back surface of the dielectric layer and transmits energy or electromagnetic waves; the metal ridge structure and the pin periodic structure are both arranged on one side, facing the dielectric layer, of the lower bottom plate layer, and a plurality of pins in the pin periodic structure are also periodically arranged beside the metal ridge structure; the metal layer, the metal ridge structure, the pin periodic structure and the lower bottom plate layer jointly form a gap wave