| 摘要 |
PROBLEM TO BE SOLVED: To constantly provide the best sensitivity without enlarging the dimension. SOLUTION: When information is written and read from an non-illustrated reader/writer, a voltage corresponding to each of multiple voltage values stored in an auxiliary memory 22 is provided to a varactor 13A as variable means, and after detecting the level of a signal obtained via a single antenna 12, the voltage to the varactor 13A is fixed to one corresponding to a maximum signal level. |
