Currently, for manufacturing UHF RFID passive tags, the online inspection mechanism is very simple. This mechanism tries to read tag IDs in the near field, and hence validates tag’s usability. For UHF RFID applications, tag usability is a very rough indicator and cannot characterize the performance of a tag accurately. In practice, effective reading distance is the key performance index of a tag. This study proposes chip’s turn-on power approach to characterize the effective reading distance of UHF RFID passive tags. The experimental results presented in this paper demonstrated the feasibility of this approach. Moreover, in comparison with the large-scale setup, this mini-scale setup produces a smaller error in the estimation of the effective reading distance. Using a mini anechoic chamber, the mini-scale setup can be adopted in practice for online tag performance inspection to grade tag’s compliance with effective reading distance.
To implement an ultra high frequency (UHF) RFID system, the first problem that an enterprise faces is the assurance of stable and extremely high reading rates. Empirical investigations indicated many hardware and environment factors can affect the reading rates. Unfortunately, even if all of the hardware and environment factors have been resolved, reading a large number of RFID tags in a single run is still a challenge. For RFID systems with massive tags, signal collision is the major factor to reduce system reading rate. To diminish the influence induced by signal collision, this study examined the anti-collision technology applied in EPCglobal UHF Gen II standards and proposed the method of adapting the Q parameter of control module in UHF RFID interrogator. Finally, we conducted field simulation to monitor relative reading rates under different conditions with different tag numbers, speeds passing through portal and Q values. Following by experimental results, this study provided the criteria to determine optimal Q value by activating system. With proper Q value, stable and extremely high reading rates in one-time reading of a large number of RFID tags (100 and above) can be achieved.
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