SELF-PARAMETERISING RFID ANTENNA EXTENDER
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Accused Products
Abstract
An antenna extender configured to be coupled electromagnetically to an RFID read/write station. The extender includes a first circuit oscillating at variable frequency and a second oscillating circuit coupled to the first oscillating circuit, and a processing unit which is powered by energy supplied by the second oscillating circuit when the extender is placed close to the read/write station. The processing unit includes a mechanism to measure voltage at terminals of the second oscillating circuit and a controller that can be used to vary resonance frequency of the first oscillating circuit as a function of the value of the measured voltage to optimize frequency tuning between the extender and the read/write station.
9 Citations
28 Claims
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1-14. -14. (canceled)
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15. An antenna extender configured to be coupled electromagnetically with an RFID read/write station, the extender comprising:
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a first variable-frequency oscillating circuit and a second oscillating circuit coupled with the first oscillating circuit; a processing unit which is powered by energy provided by the second oscillating circuit when the extender is placed near the read/write station; and the processing unit comprising measurement means which measure a voltage across terminals of the second oscillating circuit and comprises control means for varying resonance frequency of the first oscillating circuit as a function of a value of the measured voltage, so as to optimize frequency tuning between the extender and the read/write station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for optimizing frequency tuning of an antenna extender coupled electromagnetically with an RFID read/write station, the extender comprising a processing unit, a first oscillating circuit, and a second oscillating circuit,
wherein the processing unit measures a voltage across terminals of the second oscillating circuit and varies resonance frequency of the first oscillating circuit as a function of a value of the measured voltage, so as to obtain a maximum value of the measured voltage.
Specification