Rfid tag having parallel resonant circuit for magnetically...

H - Electricity – 04 – B

Patent

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Details

H04B 1/59 (2006.01) G01V 3/12 (2006.01) G01V 15/00 (2006.01) G06K 19/07 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2349409

An RFID tag circuit provides magnetic decoupling and amplitude modulation. The circuit is made up of a first inductor and a second inductor connected in series, a first capacitor, a second capacitor, and a switch. The circuit includes a first resonant circuit formed from a parallel connection of the series connected first and second inductors, and the first capacitor. The first resonant circuit has a primary resonant frequency. The circuit also includes a second circuit formed from a series connection of the second capacitor and the switch. The series connection of the second capacitor and the switch are connected in parallel to the second inductor. One end of the series connected second capacitor and switch is connected to the common connection between the series connected first and second inductors.

Circuit d'étiquette d'identification à radiofréquence (RFID) qui permet le découplage magnétique et la modulation d'amplitude. Ledit circuit est composé d'un premier inducteur et d'un second inducteur connectés en série, d'un premier condensateur, d'un second condensateur et d'un commutateur. Il comporte un premier circuit résonant formé par une connexion en parallèle des premier et second inducteurs connectés en série, et du premier condensateur. Le premier circuit résonant possède une fréquence de résonance primaire. Ledit circuit comporte également un second circuit formé par une connexion en série du second condensateur et du commutateur. La connexion en série du second condensateur et du commutateur est connectée en parallèle au second inducteur. Une extrémité du second condensateur et du commutateur connectés en série est connectée à la connexion commune entre les premier et second inducteurs connectés en série.

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