Device for controlling the impedance returned on an...

H - Electricity – 01 – Q

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H01Q 7/00 (2006.01) G06K 19/077 (2006.01)

Patent

CA 2324896

The invention concerns electronic labels each associated with a product for its identification. The invention is characterised in that the label comprises a device for modifying the impedance returned on the antenna using a variable modulation resistor (26') and/or a tuning capacitor (16') with variable capacitance whose values are modified by a circuit (30) based on certain parameters such as the supply voltage Vdd, the label operating conditions, the binary messages to be transmitted to the reading device. Thus, it is possible to adapt the modulation resistor (26') and the tuning capacitor (16') to obtain optimal operating conditions with respect to the electronic label intended application.

L'invention concerne les étiquettes électroniques qui sont associées chacune à un produit pour l'identifier. L'invention réside dans le fait que l'étiquette comprend un dispositif pour modifier l'impédance ramenée sur l'antenne en utilisant une résistance variable de modulation (26') et/ou un condensateur d'accord (16') à capacité variable dont les valeurs sont modifiées par un circuit (30) en fonction de certains paramètres tels que la tension d'alimentation Vdd, les conditions d'utilisation de l'étiquette, les messages binaires à transmettre au dispositif de lecture. Il est ainsi possible d'adapter les valeurs de la résistance de modulation (26') et du condensateur d'accord (16') pour obtenir un fonctionnement optimal en regard de l'application envisagée de l'étiquette électronique.

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