Abstract: Resolutions in two-dimensional directions and characteristics of beam sweeping in an antenna having directivity are improved. A plurality of antenna elements is arranged in a two-dimensional plane. First and second feeder lines are lines for feeding power to the plurality of antenna elements from first and second directions different from each other. Directivity changes by switching the feeding directions. Furthermore, the first and second feeder lines may each include a plurality of feed lines. Directivity changes by feeding power to the plurality of feed lines with different phases from each other.