| 摘要 |
<P>PROBLEM TO BE SOLVED: To match an antenna device to a frequency band intermediate between a plurality of frequency bands where efficient transmission and reception is possible. <P>SOLUTION: A switch 150a brings a feeder line 130 and an inductance element 160a into a connected state to change an effective electric length of a feeding element 131 and the feeder line 130 and match an antenna device 100 mainly to a 1.7 GHz frequency band. A switch 150b brings the feeder line 130 and an inductance element 160b into a connected state to change an effective electric length of a feeding element 132 and the feeder line 130 and match the antenna device 100 mainly to a 800 MHz frequency band. A switch 170 brings a passive element 140 and a ground layer 120 into a connected state to match the antenna device 100 mainly to a 1.5 GHz frequency band. <P>COPYRIGHT: (C)2012,JPO&INPIT |
