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

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.

Application of Internet of Things Combined with Wireless Network Technology in Volleyball Teaching and Training

“…Using this method can efficiently complete energy transportation and information sharing between the two. In addition, the reader is slightly more complicated than the electronic tag, requiring a higher fund investment [ 17 ].…”

“…Using this method can efficiently complete energy transportation and information sharing between the two. In addition, the reader is slightly more complicated than the electronic tag, requiring a higher fund investment [17]. (1) Electronic tags can be divided into active tags, passive tags, and semiactive tags according to the different energy acquisition methods [18].…”

Print Durability and Recyclability of Label Paper Equipped with Printed RFID Antenna

“…This advancement is steering towards more environmentally friendly, cost-effective, and versatile applications, from food safety and library management to high-security authentication and IoT implementations. El-Sawy et al [39] discussed chip-less RFID tags made from copper metal traces on polyamide substrates. Tags, designed for environmental sustainability, leverage a low-cost Bluetooth detector circuit with two detection methods to create unique IDs.…”