Abstract
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.
Highlights
Most tag machinery manufacturers, such as Muehlbauer and Bielomatik [1], provide fundamental online mechanism that tries to read tag IDs in the near field, and validates tag’s usability
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
Rather than gradually positioning the RFID tag away from interrogator’s antenna, a power attenuator is used to simulate the power loss caused by transmission distance
Summary
Most tag machinery manufacturers, such as Muehlbauer and Bielomatik [1], provide fundamental online mechanism that tries to read tag IDs in the near field, and validates tag’s usability. Effective reading distance is the key performance index of a tag because most online proofed tags are inadequate for implementation due to the insufficient reading distance. To characterize the effective reading distance of an UHF RFID passive tag, the simplest approach is to gradually position the sampled RFID tag away from interrogator’s antenna in a large space until 50% or less of signal is received. Such approach implies low productivity because it is a time consuming process. In an opening area, environmental electromagnetic interference may significantly influence the measurement accuracy on effective reading distance [2,3,4]
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