Patent ID: 8305260

Claim:
An antenna device comprising: subarray antennas arranged parallel to each other with an interval on a plane, each subarray antenna including antenna elements and feeding lines, the feeding lines feeding signals to the antenna elements; and feeding interfaces, each being connected to each of the subarray antennas, wherein at least one of the feeding lines includes a phase shifter which shifts phases of the signals feeding to corresponding antenna elements, the interval of the subarray antennas is less or equal than a free-space wavelength, the subarray antennas are symmetrically arranged about a central axis on the plane, the central axis being along with the center of two adjacent subarray antennas arranged at middle of the subarray antennas when the number of the subarray antennas is even, and being along with one subarray antenna arranged at the middle of the subarray antennas when the number of the subarray antennas is odd.