RF tag, RF tag attitude detection apparatus, and RF tag attitude detection system
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United States of America Patent
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Dec 18, 2007
Grant Date -
Oct 13, 2005
app pub date -
Apr 6, 2005
filing date -
Apr 7, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the present invention, the attitude of the article with the RF tag can be automatically detected by detecting the attitude of the directional antenna of the RF tag relative to that of the directional antenna of the RF tag attitude detection apparatus based on the signal intensity of the radio signal received from the RF tag.
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