A Broadband Circular Waveguide Rotary Joint with Substrate Integrated Coaxial Line Feeder

The invention discloses a broadband circular waveguide rotary joint with substrate integrated coaxial line feeds. The broadband circular waveguide rotary joint comprises two identical substrate integrated coaxial line feeds and a circular waveguide vertically connected with the two substrate integrated coaxial line feeds. Each substrate integrated coaxial line feed comprises a top metal layer, anupper dielectric substrate, a middle metal layer, a lower dielectric substrate, a bottom metal layer and metal through holes which are sequentially stacked from top to bottom, wherein the metal through holes are communicated with all the layers, and a substrate integrated coaxial line and a substrate integrated circular cavity are formed. The middle metal layer is of a linear structure, and a terminal is located in the substrate integrated circular cavity and is circular. A metal connecting hole is formed in the circle center of the terminal and is vertically connected with the top metal layer. An annular coupling groove is further formed in the top metal layer and located in the substrate integrated circular cavity. The circular waveguide rotary joint provided by the invention solves theproblems that an existing circular waveguide rotary joint cannot realize broadband, simple structure and easy connection with a substrate integrated system at the same time, and particularly the bandwidth is obviously improved.