| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission coil antenna device in which trouble for a user to carry devices for a plurality of purposes of use with him/her is eliminated and further, security is improved. SOLUTION: The present invention relates to a transmission coil antenna device comprising an inductor 1 winding a lead wire around a magnetic core, a capacitor 3 connected in series to the inductor 1 and a power source 2 for supplying power to the inductor 1 and the capacitor 3, wherein the power source 2 is constituted of a signal generator and a current amplifier and is capable of outputting a plurality of frequencies and a resonant frequency of the inductor 1 and the capacitor 3 is set to a bottom frequency among the plurality of frequencies outputted from the power source 2. COPYRIGHT: (C)2007,JPO&INPIT
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