| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a sufficient information transmission range even when IC cards are overlapped when using. <P>SOLUTION: A booster coil L<SB>2</SB>operating as an external antenna of an IC chip CP is formed on a card base material CD, and the booster coil L<SB>2</SB>is repeatedly and continuously bent so as to have effective widths W<SB>1</SB>and W<SB>2</SB>equal to or more than three times as large as the coil width W<SB>a</SB>. Even though the booster coil L<SB>2</SB>is overlapped on another IC card, mutual interference with an antenna coil of the other IC card can be minimized. <P>COPYRIGHT: (C)2004,JPO |
