Antenna device using EBG structure, wireless communication device, and radar device

An antenna device comprising:

• a first dielectric substrate that has first and second surfaces;
• first and second antenna elements that are arranged on the first surface of the first dielectric substrate;
• a ground conductor that is arranged on the second surface of the first dielectric substrate;
• and
• an electromagnetic band gap structure that is arranged between the first and second antenna elements,
• the electromagnetic band gap structure comprising:
• a plurality of first patch conductors that are each arranged in contact with the first surface of the first dielectric substrate and are each electromagnetically coupled with the ground conductor;
• a plurality of second patch conductors that are each arranged in a prescribed distance from the first surface of the first dielectric substrate in a direction opposite to the second surface of the first dielectric substrate, and are each electromagnetically coupled with corresponding one of the plurality of first patch conductors;
• and
• a plurality of first connection conductors that electrically connect the plurality of first patch conductors with the plurality of second patch conductors,
• wherein the antenna device further comprises
• a radome that has first and second surfaces, the radome being arranged in the prescribed distance from the first surface of the first dielectric substrate in the direction opposite to the second surface of the first dielectric substrate, and the second surface of the radome opposing the first surface of the first dielectric substrate with the prescribed distance therebetween, wherein the plurality of second patch conductors is arranged on the second surface of the radome, and
• the electromagnetic band gap structure further comprises a connector component that comprises a plurality of sockets that accommodate each of the plurality of first connection conductors.