| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for enlarging inductance of a coil, inductance of a coil antenna element and antenna induced voltage, and to provide a method for electronically varying the induction voltage. SOLUTION: A current amplifier whose current gain is 0 to <1, input impedance is sufficiently low and output impedance is sufficiently high and a coil or a coil antenna element are connected in parallel with each other. Furthermore, the current gain of the amplifier is electronically controlled to electronically vary inductance of the coil or the coil antenna element and antenna induced voltage. COPYRIGHT: (C)2009,JPO&INPIT
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