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. 2020 Jun 30:2020:1-6.
doi: 10.1109/i2mtc43012.2020.9129085. Epub 2020 May 28.

Multi-Bit Chipless RFID Sensing Methodology for Rotation Determination

Katelyn Brinker  1 , Reza Zoughi  1
Affiliations

Multi-Bit Chipless RFID Sensing Methodology for Rotation Determination

Katelyn Brinker et al. IEEE Int Instrum Meas Technol Conf. .

Abstract

Chipless RFID tags can be used for both identification and sensing applications. While binary codes are assigned to the responses of ID tags, they typically are not assigned to the responses of sensing tags. Instead, changes in tag response characteristics, like notches, are related to a sensing parameter. While this provides for a straightforward sensing mechanism, it can be limiting in terms of the dynamic range and sensing resolution that can be achieved. This paper proposes assigning multi-bit codes to the responses of sensing tags in order to better capture the effect of the sensing parameter on the tag response and provide greater sensing capabilities. This is done in the context of a rotation sensing with a tag that is capable of sensing 1° rotations from 0° to 180°. It is also shown that using tags with higher notch densities for sensing can result in better sensing resolution.

Keywords: chipless RFID; resolution; rotation; sensor.

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Figures

Fig. 1:
Fig. 1:
Rotation sensitive tags: a) 4-spiral tag, b) 8-spiral tag, c) CST Microwave Studio® simulation setup.
Fig. 2:
Fig. 2:
Tag responses: 4-spiral tag S11 response, and e) 8-spiral tag S11 response.
Fig 3:
Fig 3:
Demonstration of rotation sensitivity of the 4-spiral tag.
Fig. 4:
Fig. 4:
Demonstration of rotation sensitivity for 8-spiral tag.
Fig. 5:
Fig. 5:
Ambiguity case example for the 4-spiral tag.
Fig. 6:
Fig. 6:
Illustration of encoding of a portion of the 4-spiral tag response.
Fig. 7:
Fig. 7:
Normalized decimal code as a function of rotation angle for 4-spiral tag.
Fig. 8:
Fig. 8:
Rotation sensing measurement setup.
Fig. 9:
Fig. 9:
Manufactured tag.
Fig. 10:
Fig. 10:
Rotation measurements: a) 4-spiral tag rotation measurements, b) 8-spiral tag rotation measurements.
Fig. 11:
Fig. 11:
5° increments of rotation for the 4-spiral tag.
See this image and copyright information in PMC

References

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