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

A wireless communication device comprising:

• an antenna device;
• and
• a wireless communication circuit that uses the antenna device to transmit and receive wireless signals,
• the antenna device comprising:
• a dielectric substrate that has first and second surfaces;
• first and second antenna elements that are arranged on the first surface of the dielectric substrate;
• a ground conductor that is arranged on the second surface of the dielectric substrate;
• and
• an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate, and
• the electromagnetic band gap structure comprising:
• a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor;
• and
• at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.

A radar device comprising:

• an antenna device;
• and
• a radar transmission and reception circuit that uses the antenna device to transmit and receive radar waves,
• the antenna device comprising:
• a dielectric substrate that has first and second surfaces;
• first and second antenna elements that are arranged on the first surface of the dielectric substrate;
• a ground conductor that is arranged on the second surface of the dielectric substrate;
• and
• an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate, and
• the electromagnetic band gap structure comprising:
• a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor;
• and
• at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.