The invention relates to an integrated wide-narrow
ridge waveguide and a manufacturing process thereof. The
waveguide comprises an upper cavity, a lower cavity and a plurality of middle cavities, wherein
waveguide cavities are formed between the upper cavity and the lower cavity, the middle cavities are uniformly distributed between the waveguide cavities, each waveguide cavity is divided into wide-side
ridge waveguides and narrow-wave
ridge waveguides which are sequentially alternated, the upper cavity, the lower cavity and the middle cavities are positioned through seam allowance structures,and
brazing filler metal is embedded into grooves of the seam allowance structures in advance. According to the scheme, the waveguide is divided into the upper cavity, the lower cavity and the plurality of middle cavities; then, positioning among the upper cavity, the lower cavity and the plurality of middle cavities is completed by utilizing the seam allowance structures, and the
brazing fillermetal is embedded into the seam allowance grooves in advance; after the positioning is completed,
welding of a product is completed through vacuum
brazing; and compared with a traditional
extrusion technology, by using the process of the invention, precision of a product manufactured through the scheme is higher, deformation caused by
extrusion cannot be generated, and the product precision is greatly improved.