Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
권호 표지

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)
  • Published : 2007.06.30
Download PDF
⟨ Previous Next ⟩

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

References

  1. Steven Shepard, RFID, Radio Frequency Identification, McGraw-Hill, NY, 2005
  2. Youbok Lee, Antenna circuit Design, AN710, Application Note, micro ID 13.56MHz-RFID system design guide,Microchip, 1999
  3. K. Finkenzeller, Fundamentals and Applications in Contactless Smart Cards and Identification, John-Wiley, 2003
  4. Berger, Dominik, 'contactless smart card standards and new test methods': Smart card Technologies and applications - second workshop technologies and applications, IEEE Tagungsband, Berlin, 1998
  5. Jurianto, Joe and Chia, Michael, 'voltage, efficiency calculation and measurement of low power Rectena rectifying circuit, Sigapore Science Park, Center for wireless Communication
  6. Jurianto, Joe and Chia, Michael, 'Zero bias Schottky Diode Model for low power, Moderate current Rectenat, Sigapore Science Park, Center for wireless Communication
  7. Muhlberger, Andreas, 'High speed public encryption on contactless smart card', Philips Semiconductors, 2001. http://www. semiconductors.philips, com
  8. Philipp, Stefan, CISI vs. RISC and a plea for peace. 'Enhanced Microcontroller Architecture for Smart Card ICs, Philips Semiconductors, 2001
  9. Ullerich, S. Mokwa, G. Bogle, 'Micro coils for an advanced system for measuring intraocular pressure, Technical Digest 1st annual International IEEE-EMBS Special Topic Conference on Microelectronics in medicine and biology, France, 2000