Dual-band antenna using coupled feeding and electronic device comprising the same

An antenna array comprising:

• a first antenna which includes a first radiation plate including a first opening, and a first conductive plate disposed in the first opening;
• and
• a second antenna which is disposed to be spaced apart from the first antenna at a first interval in a first direction, and includes a second radiation plate including a second opening, and a second conductive plate disposed in the second opening,
• wherein the first antenna is insulated from the second antenna by a first insulating layer,
• the first opening exposes an upper surface of the first conductive plate, and an upper surface of a second insulating layer which insulates the first conductive plate and the first radiation plate, and
• the second opening exposes an upper surface of the second conductive plate, and an upper surface of a third insulating layer which insulates the second conductive plate and the second radiation plate.

A communication device comprising:

• a first radiation plate including a first opening;
• a second radiation plate including a second opening, is the second radiation plate being disposed under the first radiation plate to be spaced apart from a lower surface of the first radiation plate;
• a third radiation plate including a third opening, is the third radiation plate being disposed under the second radiation plate to be spaced apart from a lower surface of the second radiation plate;
• a ground plane including a fourth opening, is the ground plane being disposed under the third radiation plate to be spaced apart from a lower surface of the third radiation plate;
• a first feeding element;
• and
• a first communication circuit which is electrically connected to the first feeding element and transmits and receives signals,
• wherein the first feeding element is spaced apart from the first radiation plate in the first opening, and extends in a direction away from the lower surface of the first radiation plate through the first opening,
• the first feeding element is spaced apart from the second radiation plate in the second opening, and extends in a direction away from the lower surface of the second radiation plate through the second opening,
• the first feeding element is spaced apart from the third radiation plate in the third opening, and extends in a direction away from the lower surface of the third radiation plate through the third opening,
• the first feeding element is spaced apart from the ground plane in the fourth opening, and extends in a direction away from the lower surface of the ground plane through the fourth opening, and
• the first feeding element includes a first conductive plate located on a same plane as an upper surface of the first radiation plate, a second conductive plate located on a same plane as an upper surface of the second radiation plate, and a third conductive plate located on a same plane as an upper surface of the third radiation plate.