| 摘要 |
A radio data communication apparatus includes first antennas, modulation circuits, an oscillating circuit, a switch circuit, a memory, and a control circuit. The first antennas perform a one-to-one radio communication with second antennas of IC tags having different communication frequencies. The one-to-one radio communication is carried out based on a resonance frequency uniquely assigned to each one of combinations between the first antennas and the second antennas. The memory stores communication information of each IC tag, including an assigned resonance frequency. The control circuit reads a resonance frequency assigned to a second antenna belonging to a target IC tag, generates the control signal such that the switch circuit selects a specific carrier wave having a frequency substantially equal to the resonance frequency read from the memory, and transmits the specific carrier wave and data to be transmitted in synchronism with each other to a corresponding modulating circuit.
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