| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate the restriction with respect to a structure and size of a reader/writer caused by the fact that the positional relation between the reader/writer and an antenna of an IC tag greatly affects communication accuracy since the communication distance is as short as a few mm to tens of mm in the case of an electromagnetic coupling method in transmission and reception of data in wireless communication between the reader/writer (antenna plus controller) of RFID (Radio Frequency-Identification) and the IC tag capable of storing information in electronic circuits. <P>SOLUTION: In a data communication system in RFID, a third antenna enabling adjustment of the resonant coupling coefficient except the antenna formed by directly connecting respective control circuits of a reader/writer and an IC tag is built in the reader/writer, thereby increasing the degree of freedom in a structure and size of the reader/writer while securing stable transmission and reception. <P>COPYRIGHT: (C)2013,JPO&INPIT |
