| 摘要 |
PROBLEM TO BE SOLVED: To efficiently detect individual data of a data transponder even when a passive side antenna is formed large and the frequency of a converter is set high. SOLUTION: A data transmitter-receiver 6 transmitting and receiving various data is provided, a converter 8 which generates and outputs a specified electromagnetic wave by adjusting impedance and also sets a frequency is provided, connecting to the data transmitter-receiver, a small active side antenna 10 which generates magnetism by the specified electromagnetic wave outputted by the converter and is of a required size is provided, connected to the converter, a large passive side antenna 12 which is made to pass through the data transponder having individual data and is also larger than the active side antenna so as to generate an electromagnetic wave by electromagnetic induction due to magnetism generated by the active side antenna is provided adjacently to the active side antenna, the specified electromagnetic wave outputted from the converter to the active side antenna is subjected to magnetic induction to the passive side antenna, and the electromagnetic wave of the passive side antenna is made to resonate in a frequency set in the converter. |
