Radio transponder

Details Radio transponder Radio transponder

1997-08-13

1999-08-24

Lee, Benjamin C.

Communications: electrical

Condition responsive indicating system

Specific condition

34082554, 340571, 343745, 455 78, 455 41, 455 63, 455 83, G08B 1314

Patent

active

059429771

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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patent: 5710458 (1998-01-01), Iwasaki

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