Electronic device comprising antenna, and operation method thereof

An electronic device comprising:

• a housing having a front surface, a rear surface and a side surface member and comprising a first side, a second side extending from and substantially perpendicular to the first side and a third side extending from the second side and substantially perpendicular to the second side, wherein the side surface member comprises
• a first conductive portion forming at least a part of the first side and a first part of the second side,
• a second conductive portion spaced apart from the first conductive portion by a first insulating portion and forming a second part of the second side, and
• a third conductive portion spaced apart from the second conductive portion by a second insulating portion and forming a third part of the second side;
• a wireless communication circuit disposed in the housing;
• a sensor configured to detect a proximity of a human body to the electronic device;
• a first switching circuit configured to change an electrical connection between the wireless communication circuit and at least one of the first conductive portion or the second conductive portion based on whether the proximity of the human body to the electronic device is detected;
• and
• a second switching circuit configured to change an electrical connection between the wireless communication circuit and at least one of the second conductive portion or the third conductive portion based on whether the proximity of the human body to the electronic device is detected.