| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a data reader and an antenna capable of extending the communication distance. <P>SOLUTION: The antenna attached to the data reader has a constitution for setting the reactance C<SB>a</SB>of a primary coil side reactance circuit on the basis of a value C<SB>b</SB>of a secondary coil side capacitor, so that the communication distance can be extended. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
