The invention relates to the field of the array antenna technology, particularly to a
planar array antenna and an array method thereof. The antenna comprises four array modules; each array module is formed by array combination of a plurality of wire units; and the four array modules are arranged in
four quadrants of a rectangular coordinate
system. In the same quadrant, each two adjacent rows of antenna units deviate at a certain distance along a horizontal direction and each two adjacent columns of antenna units deviate at a certain distance along a longitudinal direction, so that all antenna units in the same quadrant are arranged in a quadrangle array manner; and the array modules in each two adjacent quadrants are arranged symmetrically relative to a coordinate axis between the adjacent two quadrants. All modules in the
four quadrants are arranged symmetrically, so that the
engineering implementation efficiency can be reduced; the antenna units in the
antenna array only make translation instead of rotation, so that the original polarization characteristics of the antenna units are kept and thus
antenna polarization synthesis can be realized.