| 摘要 |
PROBLEM TO BE SOLVED: To provide a coil antenna capable of suppressing variance in performance. SOLUTION: A ferrite core 12 is a magnetic body formed in a substantially rod-like shape, a bobbin 13 wound with winding 14 is inserted into the ferrite core 12, and the position of the bobbin 13 relative to the ferrite core 12 is adjusted to set inductance of the coil antenna 11. Further, a capacitor 15 connected to the winding 14 is fixed to the bobbin 13, and the winding 14 and capacitor 15 are configured to move together when the inductance of the coil antenna 11 is adjusted. The present invention is applicable to, for example, a coil antenna of a communication device used for an entry system for a vehicle. COPYRIGHT: (C)2010,JPO&INPIT |
