Radio transponder
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United States of America Patent
Stats
-
Aug 24, 1999
Grant Date -
N/A
app pub date -
Aug 13, 1997
filing date -
Aug 13, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A transponder adapted to be used in a checkout or inventory control system is disclosed which transmits by modulating and re-radiating a transponder signal frequency derived from a carrier frequency received on a transmitting antenna. The transponder includes a dual mode antenna and circuitry which selectively operates the antenna to suppress undesired emission of the transponder signal frequency when the transponder is not transmitting. A terminating circuit is further disclosed which suppresses undesired emission of the transponder signal frequency by a demodulator portion of the transponder.
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