| 摘要 |
PURPOSE: An article losing preventing alarm and article management apparatus are provided to generate an alarm when an article becomes far more than a predetermined distance, so preventing the article from being lost. CONSTITUTION: An RF tag(200) includes a resonance circuit and a signal sending means(100) attached at an article to be managed. A signal receiving and alarm generating means detects a radio signal generated within a predetermined distance from the RF tag(200) and generates an alarm according to the detected signal level. The signal sending means(100) includes a signal wave generating part(110) for generating a signal waveform, a carrier wave generating part(120) for generating a carrier wave, a modulation part(130) for loading the signal wave on the carrier wave so as to be modulated into an RF signal, an amplification part(140) for amplifying the modulated RF signal, and a transmission part(150) for sending the amplified RF signal through an antenna.
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