READER DEVICE, AND TRANSMITTING METHOD AND TAG OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a transmitting method capable of improving the efficiency of power supply from a reader to an RF tag to improve frequency use efficiency of wireless communication from the reader to the RF tag without increasing the bandwidth and also extend a communication distance from the RF tag to the reader.

SOLUTION: A reader device which communicates with the RF tag by wireless has a sending-out means of making constant peaks of respective symbols of a signal after N-value (N:≥4) Manchester coding modulation and sending out a signal whose symbols are made partially different in amplitude value and a means of receiving and demodulating the signal from the RF tag.

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