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A Study on Power Stability Improvement in the Inductive Coupled RFID Transponder System  

Kim, Gi-Rae (Electronics Engineering Department, University of Silla)
Choi, Young-Kyu (Electronics Engineering Department, University of Silla)
Publication Information
Journal of information and communication convergence engineering / v.5, no.2, 2007 , pp. 150-154 More about this Journal
Abstract
Transponders of RFID system are classified as active or passive depending on the type of power supply they use. In passive transponders the data carrier has to obtain its power from the induced voltage. The induced voltage is converted into direct current using a low loss bridge rectifier and then smoothed. In practice, the induced voltage in the transponder coil is variable according to the coupling coefficient k and the load resistance ($R_L$). Therefore, the rectified voltage is unstable and the transponder of RFID is unstable sometimes. In this paper, a voltage-dependent shunt resistor ($R_s$) circuits are designed and inserted in parallel with the load resistance of RFID transponder in order to improve the stability of power.
Keywords
Rectifier; Transponder; Inductive Coupled Coil;
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