Linear polarization high-power microwave mode conversion antenna

The utility model discloses a linear polarization high-power microwave mode conversion antenna, which comprises a horizontal cross-shaped branch waveguide assembly, a cylindrical conversion section, an input waveguide assembly and an output waveguide assembly, the branch waveguide assembly is formed by vertically intersecting four rectangular branch waveguides A, B, C and D pairwise to form a horizontal cross-shaped branch waveguide assembly, and the horizontal cross-shaped branch waveguide assembly comprises a horizontal cross-shaped branch waveguide outer conductor and a horizontal cross-shaped branch waveguide inner conductor arranged in the branch waveguide outer conductor. According to the utility model, the defects of complex structure, low transmission efficiency, low directional radiation gain and the like of a mode converter can be overcome, the structure is compact, and a circular waveguide TM01 mode or a coaxial TEM mode can be directly converted into a linearly polarized hollow waveguide TE11 mode