DEVICE FOR CONTROLLING THE IMPEDANCE RETURNED ON AN ELECTRONIC LABEL ANTENNA

摘要

Each its identity of associated product of electronic label of the present invention. The invention is characterised in that the label includes using variable modulation resistance (26 ") and/or tuning capacitor (16 ") there is whose value of variable capacitance to modify for modifying the antenna for the impedance that equipment returns, certain parameters are based on by circuit (30), such as supply voltage Vdd, under the operating condition of label, binary message is transferred into reading device. Therefore it is possible to make modulated resistance device (26 " ') with tuning capacitor (16 ") to obtain the application optimum Working about the electronic marker considered.