Dual frequency identification system
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United States of America Patent
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-
Mar 3, 1987
Grant Date -
N/A
app pub date -
Nov 29, 1984
filing date -
Nov 29, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An identification system comprising one or more tags and an interrogator. A tag is responsive to a radio frequency signal transmitted from the interrogator for phase modulating the signal alternately with a first frequency and a second frequency depending on a preselected code and for re-radiating the phase modulated signal back to the interrogator.
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