Errors of phases and group delays in SAW RFID tags with phase modulation

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Tao HanYongan Shui

Abstract

To achieve high-volume code capacity for SAW-based radio frequency identification(RFID) tags, it is very important to improve the delay time resolution. An efficient encoding method is to use the phase delay of the carrier wave in the pulses, but one has to solve the issues of the phase ambiguity at unknown temperatures and the location of reflectors to exact positions. In this paper, a method is proposed to obtain a high-phase delay resolution by measuring group delays and constructing a certain restriction on the exact positions of reflectors. To define the restriction parameter for a SAW RFID system with large code capacity, it is imperative to have a priori knowledge of the errors of the phases and group delays. The experimental and simulation errors for both the phases and the group delays, originated from the design procedure, the temperature effect, the fabrication process and the measurement, are presented. The error probability distribution curves in simulation and experiments are plotted. The maximum error of phase delay is about +/- 14 degrees, and the maximum error of group delay is about +/- 4 periods. The temperature range in investigation is from -5 to 45 degrees C.

References

Dec 17, 2004·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Leonhard M Reindl, Ismail M Shrena
Jul 19, 2006·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Stefan SchusterAndreas Stelzer
Aug 28, 2007·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Weibiao WangYongan Shui
Jul 5, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Tao HanYongan Shui
Nov 7, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Sanna HärmäVictor P Plessky
Nov 7, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·J H KuypersM Esashi

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