Antenna for wearable device

A wearable electronic device comprising:

• a housing comprising:
• an upper surface,
• a lower surface, and
• a side surface surrounding a space between the upper surface and the lower surface, the side surface comprising a ring-shaped member that is ring-shaped when viewed from an upper side of the upper surface and is formed of a conductive material;
• a binding structure connected to the housing and removably mountable in a part of a body of a user;
• a display exposed through the upper surface, the display comprising a first ground plane, which is substantially parallel with the upper surface, in the space;
• a printed circuit board (PCB) comprising a second ground plane, which is disposed between the display and the lower surface, in the space;
• a wireless communication circuit disposed in the PCB and electrically connected with a first point located in the ring-shaped member;
• a first conductive path electrically connected between a second point located at a rim of the first ground plane and the second ground plane;
• a second conductive path electrically connected between a third point located at the ring-shaped member and the second ground plane;
• at least one processor disposed in the space and electrically connected to the display and the communication circuit;
• a motion sensor configured to sense movement of the wearable device;
• and
• a plurality of switch circuits connecting the side surface of the housing and the second ground plane,
• wherein the first point and the second point are spaced apart by an angle of 120 degrees or less with respect to a center of the upper surface,
• wherein the at least one processor is configured to control the plurality of switch circuits based on the sensed movement obtained from the motion sensor, and
• wherein the at least one processor is further configured to:
• when the movement sensed by the motion sensor is determined as a direction of an antenna continuously varies in a specific period, control the plurality of switches to allow the antenna to operate in a loop mode, the loop mode being formed based on at least a metal structure and a ground area, and
• when a direction of a display sensed by the motion sensor corresponds to a specific direction in the specific period, control the plurality of switches allow the antenna to operate in a patch mode, the patch mode being formed based on at least a metal layer.