| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio card reader/writer suitable for its practical use by reducing any adverse influence on communication due to the direction of a radio card. SOLUTION: This radio card reader/writer 11 is provided with first and second opposite transmission antennas 15 and 18, and the communication of data with a radio card 30 passing between the first and second transmission antennas 15 and 18 is operated. Also, this radio card reader/writer 11 is provided with a control means 16 for switching a transmission signal to be supplied to the first and second transmission antennas 15 and 18 to co-phase and anti- phase. |
