Millimeter wave cross scanning multi-beam array antenna based on common-cavity Rotmann lens

The invention belongs to the technical field of array antennas, and particularly provides a millimeter wave cross scanning multi-beam array antenna based on a common-cavity Rotmann lens, a topological structure of the common-cavity Rotmann lens is adopted to feed the millimeter wave cross scanning multi-beam array antenna, the topological structure is composed of two groups of orthogonal sub-networks, each group of sub-networks is only composed of a feed source contour and inner and outer array contours (a virtual port of a traditional Rotmann lens is not added), the two groups of Rotmann lenses are orthogonally placed and form a closed common cavity (common-cavity Rotmann lenses), and the two groups of sub-networks are ensured not to be overlapped and interfered through the constraint design of the common-cavity Rotmann lenses. The input port can be switched to realize different directional angles, and the output port is connected with the radiation structure; according to the multi-beam array antenna design