Circulator assembly suitable for filter

The circulator assembly comprises a first waveguide cavity, the first waveguide cavity is communicated with one end of a rectangular waveguide cavity, a first impedance matching step is arranged between the first waveguide cavity and the rectangular waveguide cavity, and the left side and the right side of the other end of the rectangular waveguide cavity are communicated with a first ridge and a second ridge respectively. The first ridge and the second ridge are communicated with the circular boss, one end of the first ridge, one end of the second ridge and one end of the rectangular waveguide cavity are communicated with the second waveguide cavity and the third waveguide cavity through the transition cavity, the circular boss is arranged in the transition cavity, and a ferrite column is connected in the circular boss. A second impedance matching step and a third impedance matching step are arranged between the second waveguide cavity and the circular boss and between the third waveguide cavity and the circ