| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an antenna for a tunnel type reader/writer which achieves miniaturization and power saving as a magnetic path is formed of magnetic materials, a conductor to break a magnetic field is set up in the magnetic path, the magnetic materials of X and Y axes are shared by setting up each coil between the magnetic materials including the conductor, and a space is formed closely between a conductor cover wall face and the magnetic material. <P>SOLUTION: A XY axes antenna 110 arranges L-shaped ferrite cores P, Q, R and S in a loop shape, the conductors 34 and 39 are arranged at each boundary, a coil A is arranged so as to step over the ferrite cores P and S including the conductor 34, a coil B is arranged so as to step over the ferrite cores P and Q including the conductor 39, a coil C is arranged so as to step over the ferrite cores Q and R including the conductor 34, and a coil D is arranged so as to step over the ferrite cores R and S including the conductor 39. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
