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

In this paper, we have designed an 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 six inductors. To improve the overall sensitivity of the receiver, we have designed a system using a circulator, low noise amplifier (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. Copyright © 2009 John Wiley & Sons, Ltd. In this paper, we have designed an RFID 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 six inductors. To improve the overall sensitivity of the receiver, we have designed a system using a circulator, an LNA, and a SAW filter. The experimental results are superior to the commercial receiver. Copyright © 2009 John Wiley & Sons, Ltd.