Patent ID: 8072310
Filing Date: 2011-12-06
Classification: H04B

Abstract:
1. A wireless passive transponder system, comprising: an inductively activated passive transponder which has a known resonate center frequency and bandwidth; an inductive pulse generator which excites said transponder using a single magnetic pulse thereby causing said transponder to oscillate at said resonate center frequency; a receiver which includes an amplitude modulation detector which extracts a demodulated signal of said oscillation of said transponder; a measuring circuit which converts a decay rate of said demodulated signal to said transponder's bandwidth; a computational unit which replaces or augments said measuring circuit; said computational unit controls a sequencing of pulses from said inductive pulse generator to form a collection of said receiver's output data to form an interrogation cycle; said computational unit averages or processes multiple said interrogation cycles to reduce noise to improve measurement accuracy of said transducer bandwidth, and said computational unit uses multiple randomly varying times between said interrogation cycles thereby reducing interference from background signals to improve measurement accuracy of said transducer bandwidth.