Sensitivity improvement of the receiver module in the passive tag based RFID reader

Authors:
Seunghak Rhee;Jongan Park;Jonghun Chun
Affiliations:
Dept of Information & Communication Engineering, Chosun University, Namdo Provincial College of Jeonnam Gwangju, Korea;Dept of Information & Communication Engineering, Chosun University, Namdo Provincial College of Jeonnam Gwangju, Korea;Dept. of Information & Communication, Namdo Provincial College of Jeonnam Gwangju, Korea
Venue:
UIC'07 Proceedings of the 4th international conference on Ubiquitous Intelligence and Computing
Year:
2007

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Abstract

In this paper, we have designed a RFID reader receiver system for improving the performance of the passive Tag based 908.5-914 MHz RFID reader, and analyzed the system performance vis-à-vis frequency, reader, and tag properties. The commercial receiver system causes a loss in sensitivity because of its 24 capacitors and 6 inductors. To improve the overall sensitivity of the receiver, we have designed a system using a circulator, LNA and a SAW filter. The experimental results show that the use of a circulator to separate the Tx/Rx paths eliminates interference, the LNA improves the sensitivity of the Rx module and SAW filter eliminates the noise and spurious components in the received signal.