| 摘要 |
<P>PROBLEM TO BE SOLVED: To form an antenna device which matches impedance with a feeder circuit in a wide frequency band and a communication terminal unit including the antenna device. <P>SOLUTION: An antenna device 106 includes an antenna element 11 and an impedance conversion circuit 25 connecting to the antenna element 11. The impedance conversion circuit 25 connects with a feeding end of the antenna element 11. The impedance conversion circuit 25 is disposed between the antenna element 11 and a feeder circuit 30. The impedance conversion circuit 25 includes a first inductance element L1 connecting to the feeder circuit 30 and a second inductance element L2 connecting to the first inductance element L1, and a first end and a second end of the first inductance element L1 are respectively connected to the feeder circuit 30 and an antenna. A first end and a second end of the second inductance element L2 are respectively connected to the antenna element 11 and a ground. <P>COPYRIGHT: (C)2012,JPO&INPIT |
