HALF-DUPLEX RFID TRANSPONDER AND A METHOD OF OPERATING A HALF-DUPLEX RFID TRANSPONDER
First Claim
1. A half-duplex RFID transponder with an integrated three-dimensional front-end circuit, the RFID transponder comprising three LC resonant circuits arranged in a three-dimensional configuration, each LC resonant circuit being coupled to a different one of three storage capacitors which are charged during a capacitor charging phase by energy comprised in an RF signal received by the associated LC resonant circuit,the front-end circuit comprising:
- three receiver channels, each receiver channel being associated to a different one of the three LC resonant circuits;
a channel selector which is adapted to detect, which one of the three storage capacitors is first charged to a threshold voltage,to select the receiver channel associated to the LC resonant circuit which is coupled to the storage capacitor which is first charged, andto deactivate the two other receiver channels.
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Accused Products
Abstract
A half-duplex RFID transponder with an integrated three-dimensional front-end circuit which includes three LC resonant circuits arranged in a three-dimensional configuration. Each LC resonant circuit is coupled to a different one of three storage capacitors which are charged during a capacitor charging phase by energy in an RF signal received by the associated LC resonant circuit. The front-end circuit includes three receiver channels and each receiver channel is associated to a different one of the three LC resonant circuits. A channel selector is adapted to detect, which one of the three storage capacitors is first charged to a threshold voltage, to select the receiver channel associated to the LC resonant circuit which is coupled to the storage capacitor which is first charged and to deactivate the two other receiver channels. A method of operating a half-duplex RFID transponder with three LC resonant circuits arranged in a three-dimensional configuration with each LC resonant circuit coupled to a different storage capacitor which is charged during a capacitor charging phase by energy in an RF signal received by the associated LC resonant circuit. Three receiver channels are associated to the three LC resonant circuits. The method includes monitoring the charge level of each of the three storage capacitors, detecting which storage capacitor is first charged to a threshold voltage, selecting the receiver channel associated to the first charged storage capacitor and deactivating the two other receiver channels.
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Citations
20 Claims
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1. A half-duplex RFID transponder with an integrated three-dimensional front-end circuit, the RFID transponder comprising three LC resonant circuits arranged in a three-dimensional configuration, each LC resonant circuit being coupled to a different one of three storage capacitors which are charged during a capacitor charging phase by energy comprised in an RF signal received by the associated LC resonant circuit,
the front-end circuit comprising: -
three receiver channels, each receiver channel being associated to a different one of the three LC resonant circuits; a channel selector which is adapted to detect, which one of the three storage capacitors is first charged to a threshold voltage, to select the receiver channel associated to the LC resonant circuit which is coupled to the storage capacitor which is first charged, and to deactivate the two other receiver channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of operating a half-duplex RFID transponder with three LC resonant circuits arranged in a three-dimensional configuration, each LC resonant circuit being coupled to a different one of three storage capacitors which are charged during a capacitor charging phase by energy comprised in an RF signal received by the associated LC resonant circuit, and with three receiver channels associated to the three LC resonant circuits, the method comprising:
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monitoring the charge level of each of the three storage capacitors; detecting which storage capacitor is first charged to a threshold voltage; selecting the receiver channel associated to the LC resonant circuit which is coupled to the storage capacitor which is first charged; and deactivating the two other receiver channels.
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Specification