A mobile communication device includes an antenna structure. The antenna structure includes a circuit board. A ground plane is disposed on the second surface of the circuit board and includes a first side edge and a second side edge. An antenna element is disposed on the first surface of the circuit board or placed near the circuit board, and includes a first operating band and a second operating band. A first inductively-coupled element is located near the first side edge of the ground plane, and includes a metal plate and an inductive element. The metal plate is electrically connected to the ground plane through the inductive element. The first inductively-coupled element generates a resonant mode at a specific frequency within the second operating band to reduce a surface current excitation on the ground plane and to reduce near-field E-field and H-field strengths of the mobile communication device within the second operating band.