Abstract
A circular polarized circulator which comprises an input port, a reflection output port, a polarized conversion body and a matching device in which the input port is a rectangular waveguide tube, the output port is a dummy load. The circular polarizer body comprising a first circular waveguide tube coupled with the followed ellipsoid waveguide tube and coupled with the followed second circular waveguide tube. The rectangular input port and the first circular waveguide tube is are at 90 degree angle and connected with the first circular waveguide tube through a coupling aperture and configuring the matching device on one side of the aperture to achieve best matching coupling. The polarizing direction of linear polarized input wave from the input port is at 45 degree with the long axis of ellipsoid waveguide tube, and the length of ellipsoid and cross-section size can make the two character modes in the input wave have 90 degrees of phase difference while arriving the end of ellipsoid waveguide tube. Therefore, the second circular waveguide tube can get the circular polarized wave and the three-port device composed of the input port, the second circular waveguide tube and the output port can execute the function of circulator.