| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a magnetic antenna in which communication sensitivity is improved by enlarging the inductance of the coil restricted by a resonance frequency more than the prior arts. <P>SOLUTION: An RF tag is provided in which an IC 10 is mounted on a magnetic antenna 20 which transmits/receives information using an electromagnetic induction system. In the magnetic antenna, a plurality of coils wherein the inductance L<SB>1</SB>satisfies a specific relational expression are formed on one magnetic core, the coils are connected in parallel on an electric circuit and are arranged in series with the magnetic core, and the synthesized inductance L<SB>0</SB>of the magnetic antenna satisfies a specific relational expression. <P>COPYRIGHT: (C)2010,JPO&INPIT |
