Low-cost thin-film passive RFID circuits and detector system
Type :
Article
Publication Status :
Published
Access :
restrictedAccess
Abstract
This paper discusses the design of chip-less RFID tags of a standard pocket size of 69 mm by 156 mm. These tags are based on lumped elements of copper metal traces constructed on a thin polyamide flexible substrate. Moreover, a low-cost single-chip Bluetooth detector circuit system is demonstrated. Two different detection methods: variable coil load coupling and optical light intensity detection were combined to yield 256 unique ID codes. In the first method, by utilizing simple 4 MHz digital drivers and an integrated analog to digital converter (ADC) in the reader controller; various inductively coupled resonant loads corresponding to multiple distinct tags could be differentiated, yielding eight different (3-bit) ID codes. The additional via-based hole pattern reflectometer method creates additional 32 distinct levels (5-bit) utilizing 650 nm visible light-emitting diode and a simple trans-impedance operational along with the same analog ADC pins of a Bluetooth controller. The printed circuit board trace coil on the two-layer low-cost FR-4 waterproof sealed detector unit is simultaneously used as a Qi wireless power receiver to charge the120 mAh 2450 Lithium Polymer (LiR) battery. The device could remain operational for more than a month with a single charge; remaining connected with a mobile device and enabling 10 readouts daily.
Source :
International Journal of Microwave and Wireless Technologies
Date :
2020-06
Volume :
12
Issue :
5
Publisher :
Cambridge University Press
URI
http://hdl.handle.net/10679/7159https://www.cambridge.org/core/journals/international-journal-of-microwave-and-wireless-technologies/article/lowcost-thinfilm-passive-rfid-circuits-and-detector-system/24ABE9171335891E132A13EB2193A069
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