Cloaking circuit for use in a radio frequency identification...

Details Cloaking circuit for use in a radio frequency identification... Cloaking circuit for use in a radio frequency identification...

H - Electricity

04

Q

H04Q 1/00 (2006.01) G06K 7/00 (2006.01) G06K 19/07 (2006.01) G01S 13/75 (2006.01)

Patent

CA 2286602

The antenna of an RFID tag (100) is disconnected from the balance of the RFID chip by means of a series switch (24) activated in response to a logic command, CLOAK. Activation of the switch (24) disconnects the antenna (16) of the RFID tag for the remainder of the chip and effects a high impedance resistance across the antenna terminals (12, 14). An RC circuit (36, 38) is charged by activation of the CLOAK signal and thereafter discharges during a predetermined time period as determined by a high impedance series antifuse leakage transistor (34). The antenna is thus disconnected for a time sufficient to allow the remaining RFID tags to be identified.

L'antenne d'une étiquette à identification par radiofréquences (RFID) (100) est déconnectée de l'écran d'anode du circuit RFID au moyen d'un commutateur série (24) actionné en réaction à une commande logique CLOAK. L'actionnement du commutateur (24) déconnecte du reste du circuit l'antenne (16) de l'étiquette RFID et crée une haute impédance entre les bornes d'antenne (12, 14). Un circuit RC (36, 38), chargé par actionnement du signal CLOAK, se décharge pendant une durée prédéterminée, selon ce qui a été déterminé par un transistor (34) à fuite antifusible de haute impédance monté en série. L'antenne est alors déconnectée pendant une durée suffisante pour permettre l'identification des étiquettes RFID restantes.

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