A dual-band mobile communication device includes a circuit board, a ground plane, an antenna element, and a dual-band inductively-coupled element. The ground plane has an edge. The antenna element is located on the circuit board or adjacent to the circuit board. The antenna element has a first operating band and a second operating band. The dual-band inductively-coupled element is located at the edge of the ground plane. The dual-band inductively-coupled element excites two different resonant modes at two specific frequencies corresponding to the first and the second operating bands of the antenna element, respectively. The dual-band inductively-coupled element comprises a connection element, an inductive element, a first metal plate, and a second metal plate. The first metal plate is electrically connected to the ground plane through the connection element. The second metal plate is electrically connected to the inductive element.