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Low-cost thin-film passive RFID circuits and detector system

Published online by Cambridge University Press:  06 January 2020

Salma El-Sawy Open the ORCID record for Salma El-Sawy [Opens in a new window] ,
Wasim Nawaz Open the ORCID record for Wasim Nawaz [Opens in a new window] ,
Mohamed Osama  and
Ahmet Tekin
Salma El-Sawy*
Affiliation:
Özyeğin University, OZU-X Building, Istanbul, Turkey
Wasim Nawaz
Affiliation:
Özyeğin University, OZU-X Building, Istanbul, Turkey
Mohamed Osama
Affiliation:
Özyeğin University, OZU-X Building, Istanbul, Turkey
Ahmet Tekin
Affiliation:
Özyeğin University, OZU-X Building, Istanbul, Turkey
*
Author for correspondence: Salma El-Sawy, E-mail: salma.elsawy@ozu.edu.tr
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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.

Keywords

Low costmutual inductancepassive RFIDplanar finger capacitanceplanar spiral inductancereader circuitwireless charger
Type
Industrial and Engineering Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 5 , June 2020 , pp. 356 - 366
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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