| 摘要 |
In the present wireless card system of the present invention, when data is transmitted from an IC card to a card reader, the IC card changes the load imposed on the transmission system in accordance with the contents of the data, and the card reader detects a reflected wave, which is generated in accordance with a change in the load, and identifies the data. The reflected wave is not a wave emitted by the IC card into the atmosphere, but is an alternating current that relies on the load condition in the transmission system between the transmitter and the receiver, and that is returned from the load in the transmission system. Thus, the reflected wave is not easily affected by the noise field in the vicinity of the antenna, and more precise data transmission is possible.
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