| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device of a simple structure and capable of handling a plurality of resonance modes in a low-frequency band, and to provide a communication terminal equipped with the same. <P>SOLUTION: The antenna device includes: an antenna element capable of handling the signals of predetermined low frequency band and high-frequency band; a feeding terminal portion; and first and second bandwidth adjustment circuits for widening the low-frequency band to a predetermined bandwidth. By appropriately adjusting the capacitance of a capacitor and the inductance of an inductor included in the first and second bandwidth adjustment circuits, the bandwidth of the low-frequency band is widened to the predetermined bandwidth. Also, by using the first and second bandwidth adjustment circuits comprising the capacitor and/or the inductor, the structure of the antenna device is simplified more. <P>COPYRIGHT: (C)2010,JPO&INPIT |
