Waveguide circumference converting part

The utility model discloses a waveguide circumference converting part, its characterized in that: the body structure of these parts for having a plurality of step cavitys, both ends are circular respectively and rectangle waveguide interface, rectangle waveguide interface is corresponding to the rectangle cavity that has the chamfer, the circular waveguide interface is corresponding to circular cavity body, the gradual change cavity of size convergent sets gradually between circular cavity body and the rectangle cavity, the cavity is graduallyd change to the rectangle by circular. The utility model discloses an integral type structure, the reliability is high. Realize passing through between circular waveguide and the standard rectangular waveguide through a plurality of convergent cavitys that have the circular arc for this transform structure has very wide work bandwidth. Each gradual change cavity size all is less than the size of the outer first -order gradual change cavity adjacent with it to realize a parts machining. The processing lead angle of each gradual change cavity all equals 12 of this narrow limit of inner chamber to adopt the processing of large diameter milling cutter as far as, have the advantage of simple structure, handling ease.