Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 12, 2013
Patent Application Number
12644561
Date Filed
December 22, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A tag operates in an environment where transmitted interrogators are not possible or desired. High-efficiency diode rectifiers and low-power oscillators are used in combination with an energy storage element and hysteretic switch. The combination of multi-diode rectifier, low power tunnel diode oscillator, energy storage element and hysteretic switch allow for nanowatt levels of received RF power to be stored to produce micro-watts of RF transmit power. The device trickle charges off of ambient RF radiation until enough energy is stored for transmission.
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