Patent ID: 8289214

Claim:
An array antenna in which a plurality of planar antenna elements with perturbation are linearly arranged, the array antenna comprising: a first sequential arrangement section in which antenna elements are sequentially arranged linearly in one direction from a left end section to a center section such that the rotation angle Ï† n1 of the perturbation, relative to the rotation angle of the first antenna element of the first sequential section, of each antenna element in the first sequential arrangement satisfies the equation Ï† n1 =(n1âˆ’1)Ï€/N1, where n1 is the n th antenna element of the first sequential arrangement, and N1 is the total number of antenna elements of the first sequential arrangement; and a second sequential arrangement section in which antenna elements are sequentially arranged linearly in another direction opposite to and collinear with the one direction from a right end section to the center section such that the rotation angle Ï† n2 of the perturbation, relative to the rotation angle of the first antenna element of the second sequential section, of each antenna element in the second sequential arrangement satisfies the equation Ï† n2 =(n2âˆ’1)Ï€/N2, where n2 is the n th antenna element of the second sequential arrangement, and N2 is the total number of antenna elements of the second sequential arrangement; wherein the first sequential arrangement section and the second sequential arrangement section are symmetric such that Ï† n1 =Ï† n2 for n1=n2.