| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for evading the reduction of communicable distance when an antenna unit is covered by a conductive body such as metal, while suppressing the rise of a cost on the whole and the limitation of a degree of flexibility. <P>SOLUTION: When a current I<SB>1</SB>flows in a secondary coil 102 by allowing a current to flow in a first coil 101, an eddy current I<SB>2</SB>flows in a metal plate 201 in the opposite direction. A current I<SB>3</SB>flows in the opposite direction of the eddy current I<SB>2</SB>in a tertiary coil 103 by adjusting the capacitance of a capacitor Ck. Thus, a magnetic field to be generated by the eddy current I<SB>3</SB>is canceled by a magnetic field to be generated by the current I<SB>2</SB>flowing in the tertiary coil 103. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
