Patent ID: 8340736

Claim:
A mobile electronic device comprising: a first case coupled to a second case, wherein the first case and the second case are operable to provide one of a closed state and an opened state; a detection module operable to detect the opened state and the closed state; a selection switch operable to provide one of a first connection state and a second connection state, the second connection state comprising a balanced feed antenna electrically coupled to a feeding unit; and a control module operable to: select the first connection state, if the opened state is detected by the detection module, and select the second connection state, if the closed state is detected by the detection module, wherein the first connection state comprises one of the group consisting of: a first conductive unit electrically coupled to a ground unit and a second conductive unit electrically coupled to the feeding unit, and the second conductive unit electrically coupled to the ground unit and the first conductive unit electrically coupled to the feeding unit.