ANTENNA DEVICE, FEED SYSTEM, FEED DEVICE, AND FEED METHOD

To provide an antenna device capable of suppressing the spread of a reflected portion of a transmitted power signal to allow for reductions in an effect of interference on any other device that may exist around a given position. An antenna device includes an array antenna; a phase adjuster configured to adjust phases of transmission power signals supplied by multiple antenna elements, with respect to a first axis; an image acquiring unit configured to acquire an image through a fisheye lens; a deriving unit configured to convert a first position of a marker that is included in the image acquired by the image acquiring unit, into a second position of polar coordinates on a first plane that includes the first axis and a second axis, the first position being used in the image acquiring unit; an acquiring unit configured to acquire, based on the second position, an elevation angle of a projected position that is obtained by projecting the first position onto a second plane including the first axis and a third axis, the elevation angle being relative to the third axis of the second plane; a storage that stores multiple sets of phase data for respective elevation angles, the phase data indicating phases for power that is from the antenna elements and that is received by a power receive, the phases being adjusted to be matched; and a controller configured to control the phase adjuster such that a direction of a beam, emitted by the array antenna based on retrieved phase data, defines the elevation angle for the second plane, the phase data being phase data relating to the elevation angles that are within a predetermined included angle range.