Electronic proximity identification system with simplified low power identifier
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United States of America Patent
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-
Apr 1, 1986
Grant Date -
N/A
app pub date -
Dec 9, 1983
filing date -
Dec 9, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An identification system comprising a reader (10) including a first signal generator (12) for generating a first signal (F1) which is radiated by an antenna (17). An identifier (11) includes an antenna (20) receiving the first signal for transmission to a signal modulator (32) which operates to modulate the signal in accordance with a preassigned code for the identifier. The modulated signal is then used to periodically unload or change the reactance of the antenna (20) which action in turn changes the reactance of the reader antenna and consequent voltage on the reader antenna (17). By detecting the change in the voltage on the reader antenna the code of the identifier is determined. Power drain is minimized and power is used efficiently by unloading during modulation and by changing reactance without changing load.
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