The embodiment of the invention relates to the technical field of
millimeter wave antennas, and discloses a
millimeter wave antenna and a
radar system.The
millimeter wave antenna comprises a
waveguide structure, a metallization layer, an isolation structure and a
welding structure, and the
waveguide structure comprises a first
waveguide assembly and a second waveguide
assembly; the first waveguide
assembly and the second waveguide assembly are oppositely arranged to form a combination surface, the combination surface is provided with a functional area and a
welding area, the functional area forms a millimeter
wave transmission channel, the metalized layer covers the waveguide structure, the isolation structure is arranged between the
welding area and the functional area, and the metalized layer covers the isolation structure. The isolation structure is used for preventing the
soldering tin from diffusing from the
soldering area to the functional area, in this way, effective separation of the
soldering function and the waveguide
performance function can be achieved, the isolation structure can effectively prevent the soldering
tin from diffusing to the functional area, and it is ensured that the geometric dimension and the internal state of the millimeter
wave transmission channel are kept stable; and the consistency of the electromagnetic performance of the antenna core is maintained.