Charging a transponder in a security system

Details Charging a transponder in a security system Charging a transponder in a security system

H - Electricity

04

B

H04B 1/40 (2006.01) B60R 25/00 (2006.01) H04B 1/59 (2006.01) H04B 17/00 (2006.01) G07C 9/00 (2006.01)

Patent

CA 2232256

A transponder is adaptively energized using a charging electromagnetic field created by a transceiver in a security system. A partial charging electromagnetic field is transmitted providing a plurality of spaced frequency components so that one to the spaced frequency components energizes the transponder by an amount causing it to produce a partial transmission which provides an calibrated signal for identifying a frequency upon which the transponder will be transmitting. A full charging electromagnetic field limited to a single frequency component is transmitted to the transponder determined in response to a frequency calibration signal received from the transponder.

Un transpondeur est excité adaptivement au moyen d'un champ électromagnétique de charge créé par un émetteur-récepteur dans un système de sécurité. Un champ électromagnétique de charge partiel comportant une pluralité de composantes fréquentielles est transmis de telle façon que ces composantes excitent le transpondeur suffisamment pour produire une émission partielle qui fournit un signal étalonné pour déterminer la fréquence d'émission que le transpondeur utilisera. Un champ électromagnétique de charge intégral limité à une seule composante fréquentielle est transmis au transpondeur identifié par le signal étalonné reçu de lui.

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