Irregular antenna subarray, phased-array antenna and design method of phased-array antenna

The invention provides an irregular antenna subarray, a phased-array antenna and a design method of the phased-array antenna. The irregular antenna sub-array comprises a plurality of antenna units arranged in a matrix form, each row and each column of the matrix comprise at least two antenna units, and the distance between any two adjacent antenna units is equal; at least one radio frequency interface is arranged on the matrix plane, each radio frequency interface corresponds to an antenna combination composed of any four adjacent antenna units arranged in a matrix mode, and the radio frequency interface is located at the center point of the four adjacent antenna units arranged in the matrix mode in the corresponding antenna combination. The distances from the radio frequency interface to the four adjacent antenna units arranged in the matrix form are equal, and the radio frequency interface is connected with any one of the antenna units; any antenna unit is connected with at most one radio frequency interfac