Low cost transponder system

Details Low cost transponder system Low cost transponder system

G - Physics

01

V

343/20

G01V 15/00 (2006.01) G01S 13/75 (2006.01) G06K 19/07 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1295718

Abstract: A transponder arrangement is described comprising an interrogation unit which sends an RF interrogation pulse to at least one responder unit. The responder unit then transmits back data stored therein in the form of a modulated RF carrier to the interrogation unit. In the responder unit is an energy accumulator which stores the energy contained in the RF interrogation pulse. The responder unit further contains means which in dependence upon the termination of the reception of the RF interrogation pulse and the presence of a predetermined energy amount in the energy accumulator initiate the excitation of an RF carrier wave generator operating with the frequency contained in the RF interrogation pulse. Further means are provided which from the output signal of the RF carrier wave generator generate a control signal which is utilized to maintain the RF carrier wave and to modulate the RF carrier to be sent back with the stored data.

573306

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