Antenna

An antenna comprising:

• dielectric substrate including a recess;
• a conductive ground layer bonded to the dielectric substrate so as to cover the recess, the conductive ground layer including a slot that is arranged on an inner side with respect to the recess;
• a dielectric layer bonded to the conductive ground layer on a side opposite to the dielectric substrate with respect to the conductive ground layer;
• an antenna element formed on a bottom of the recess at position facing the slot;
• and
• a feed line formed on a side opposite to the conductive ground layer with respect to the dielectric layer, the feed line configured to be electromagnetically coupled to the antenna element via the slot,
• wherein the antenna element comprises a plurality of antenna elements, the plurality of antenna elements being aligned at intervals,
• the slot comprises a plurality of slots, the plurality of slots being aligned at intervals,
• the antenna elements face the slots, respectively,
• the number of the antenna elements is an even number,
• the number of the slots is an even number, and
• the feed line branches at a point between the slots adjacent to each other that are positioned in the center of a row of the slots, the feed line having branch portions that extend from the point of branch until the branch portions cross the slots at both ends of the row of the slots in plan view, respectively.