a coaxial circular waveguide, a cross-shaped waveguide power divider, a first waveguide magic T, a second waveguide magic T and an ortho-mode transition, wherein:

the coaxial circular waveguide is located on a central axis of the cross-shaped waveguide power divider and is perpendicular to a top surface of the cross-shaped waveguide power divider, the coaxial circular waveguide includes an outer circular waveguide and an inner circular waveguide located in the outer circular waveguide;

a cross-shaped waveguide cavity is formed in the cross-shaped waveguide power divider, the cross-shaped waveguide cavity is in communication with the outer circular waveguide;

the inner circular waveguide penetrates through the cross-shaped waveguide power divider, and is configured to transmit a high-frequency signal;

the cross-shaped waveguide power divider has four signal channels connected to the cross-shaped waveguide cavity, and the four signal channels are distributed in a cross shape, wherein two of the signal channels respectively located in a first direction are in communication with two input ports of the first waveguide magic T, and the other two of the signal channels respectively located in a second direction perpendicular to the first direction are in communication with two input ports of the second waveguide magic T;

an output port of the first waveguide magic T and an output port of the second waveguide magic T are both in communication with input ports of the ortho-mode transition;

the ortho-mode transition is configured to merge two input orthogonal signals into one output signal and transmit both vertical and horizontal polarizations at the same time, the two orthogonal input signals being respectively from the output port of the first waveguide magic T and the output port of the second waveguide magic T; and

an output port of the ortho-mode transition forms a circular waveguide interface.