| 摘要 |
A small antenna which can ensure a wide band is provided. The antenna is provided with magnetically coupled inductance elements (L1, L2). The antenna includes an LC serial resonance circuit composed of the inductance element (L1) and capacitance elements (C1a, C1b), and an LC serial resonance circuit composed of the inductance element (L2) and capacitance elements (C2a, C2b). A plurality of LC serial resonance circuits are used for radio emission and also as an inductance of a matching circuit for matching the impedance (50O) obtained by viewing a power supply side from power supply terminals (5, 6) with radiation impedance (377O) in a free space. |
