ANTENNA DEVICE AND COMMUNICATION TERMINAL APPARATUS

摘要

An antenna device (106) has an antenna element (11) and an impedance converting circuit (25) connected to the antenna element (11). The impedance converting circuit (25) is connected to a power-supply end of the antenna element (11). The impedance converting circuit (25) is interposed between the antenna element (11) and a power-supply circuit (30). The impedance converting circuit (25) has a first inductance element (L1) connected to the power-supply circuit (30) and a second inductance element (L2) coupled to the first inductance element (L1). A first end and a second end of the first inductance element (L1) are connected to the power-supply circuit (30) and the antenna, respectively. A first end and a second end of the second inductance element (L2) are connected to the antenna element (11) and ground, respectively.