Multivariable passive RFID vapor sensors: roll-to-roll fabrication on a flexible substrate

The Analyst ◽  
2012 ◽  
Vol 137 (12) ◽  
pp. 2777 ◽  
Author(s):  
Radislav A. Potyrailo ◽  
Andrew Burns ◽  
Cheryl Surman ◽  
D. J. Lee ◽  
Edward McGinniss
Keyword(s):  
Flexible Substrate ◽  
Roll To Roll ◽  
Vapor Sensors ◽  
Passive Rfid

STUDY OF THE INFLUENCE OF RFID TAG BENDING ON BASIC CHARACTERISTICS

2021 ◽  
pp. 85-89
Author(s):  
С.М. Фёдоров ◽  
Е.А. Ищенко ◽  
Е.В. Папина ◽  
К.А. Бердников ◽  
Ю.Д. Савкина
Keyword(s):  
Flexible Substrate ◽  
Passive Mode ◽  
Rfid Tag ◽  
Active Mode ◽  
Effective Scattering Area ◽  
Frequency Peak ◽  
Detection Mode ◽  
Basic Characteristics ◽  
Electrodynamic Modeling ◽  
Passive Rfid

Рассматривается пассивная радиочастотная метка, которая находится на гибкой подложке, что приводит к появлению проблемы с изменением характеристик при изгибе метки. В процессе исследования производилось моделирование для трех ситуаций: плоской метки, изогнутой внутрь и наружу. Благодаря современным методам электродинамического моделирования возможно определить все основные характеристики RFID метки - в активном режиме: обратные потери, диаграмму направленности; в пассивном режиме: диаграмму обратного рассеяния, токи и напряжения в нагрузке. При моделировании были построены графики зависимости амплитуд токов и напряжений в нагрузке от частоты, пиковые значения эффективной площади рассеяния. Благодаря полученным данным можно определить наиболее оптимальные частоты для облучения RFID метки, чтобы обеспечить ее работу в активном режиме (высокие токи и напряжения в нагрузке), а также в режиме обнаружения - большие значения ЭПР. Приводятся графики и таблицы для сравнения исследуемых случаев, по которым видны изменения характеристик при изгибе метки, что делает невозможным применение системы в широких диапазонах частот, так как стоит учитывать ее возможные изгибы The article discusses a passive RFID tag that sits on a flexible substrate, which leads to a problem with changing characteristics when the tag is bent. In the course of the study, we carried out modeling for three situations: a flat tag, curved inward and outward. Thanks to modern methods of electrodynamic modeling, it is possible to determine all the main characteristics of an RFID tag - in the active mode: return loss, radiation pattern; in passive mode: diagram of backscatter, currents and voltages in the load. During the simulation, we plotted graphs of the dependence of the amplitudes of currents and voltages in the load on frequency, peak values of the effective scattering area. Thanks to the data obtained, it is possible to determine the most optimal frequencies for irradiation of an RFID tag in order to ensure its operation in an active mode (high currents and voltages in the load), as well as in the detection mode - large ESR values. The article provides graphs and tables for comparing the cases under study, which show changes in characteristics when the tag is bent, which makes it impossible to use the system in wide frequency ranges, since its possible bends should be taken into account

scholarly journals Fabrication and Characterization of Roll-to-Roll Printed Air-Gap Touch Sensors

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 245 ◽  
Author(s):  
Sang Lee ◽  
Sangyoon Lee
Keyword(s):  
Printed Electronics ◽  
Sacrificial Layer ◽  
Flexible Substrate ◽  
Air Gap ◽  
Touch Sensor ◽  
Roll To Roll ◽  
Slot Die ◽  
Gap Sensors ◽  
Structural Layer

Although printed electronics technology has been recently employed in the production of various devices, its use for the fabrication of electronic devices with air-gap structures remains challenging. This paper presents a productive roll-to-roll printed electronics method for the fabrication of capacitive touch sensors with air-gap structures. Each layer of the sensor was fabricated by printing or coating. The bottom electrode, and the dielectric and sacrificial layers were roll-to-roll slot-die coated on a flexible substrate. The top electrode was formed by roll-to-roll gravure printing, while the structural layer was formed by spin-coating. In particular, the sacrificial layer was coated with polyvinyl alcohol (PVA) and removed in water to form an air-gap. The successful formation of the air-gap was verified by field emission scanning electron microscopy (FE-SEM). Electrical characteristics of the air-gap touch sensor samples were analyzed in terms of sensitivity, hysteresis, and repeatability. Experimental results showed that the proposed method can be suitable for the fabrication of air-gap sensors by using the roll-to-roll printed electronics technology.

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

2020 ◽  
Vol 12 (5) ◽  
pp. 356-366
Author(s):  
Salma El-Sawy ◽  
Wasim Nawaz ◽  
Mohamed Osama ◽  
Ahmet Tekin
Keyword(s):  
Printed Circuit Board ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Flexible Substrate ◽  
Circuit Board ◽  
Detection Methods ◽  
Single Chip ◽  
Analog To Digital ◽  
Inductively Coupled ◽  
Passive Rfid

AbstractThis 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.

scholarly journals Direct Imaging Exposure Equipment with High Overlay Accuracy for Flexible Substrate in Roll-to-Roll Method

2017 ◽  
Vol 71 (10) ◽  
pp. J230-J235
Author(s):  
Yoshiaki Kito ◽  
Masakazu Hori ◽  
Yosuke Hayashida ◽  
Tomonari Suzuki ◽  
Hiroki Komiyama ◽  
...  
Keyword(s):  
Flexible Substrate ◽  
Direct Imaging ◽  
Roll To Roll

Hybrid Inorganic/Organic Self-Assembled Clays Nanocomposites for Roll to Roll Fabrication in Photovoltaics

2009 ◽  
Vol 1196 ◽  
Author(s):  
Peter Njagwa Kariuki ◽  
Jessica Gendron ◽  
Christopher Matthew Madl ◽  
Jasper Chiguma ◽  
Michael E Hagerman ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Indium Tin Oxide ◽  
Self Assembly ◽  
Titanium Dioxide Nanoparticles ◽  
Low Cost ◽  
Flexible Substrate ◽  
Roll To Roll ◽  
Organic Photovoltaic Materials ◽  
Self Assembled ◽  
Electrically Conducting Polymers

AbstractWe have been developing a new approach to layered hybrid (inorganic/organic) photovoltaic materials for fabrication by Roll-to-Roll (R2R) manufacturing. In this report, we combine the low cost and processability of organic electrically conducting polymers with the efficiency of dye sensitized titanium dioxide, semi-conductor quantum dots (CdSe) self-assembled on layered clay materials (Laponite) onto indium tin oxide coated flexible substrate polyethylene terephthalate (PET) substrates. We have shown electron transfer, guest-guest and host-guest interactions, charge separation, spectral line broadening, and quenching of fluorescence signals which indicate electronic coupling of the dye [Ru(bpy)3]2+ on a CdSe nanocrystal and titanium dioxide nanoparticles. Scanning electron microscopy and atomic force microscopy demonstrate successful nanoparticle formation and thin film self-assembly, as well as surface morphology and polymer thickness.

Visually tolerable tiling (VTT) for making a large-area flexible patterned surface

2015 ◽  
Vol 2 (1) ◽  
pp. 86-90 ◽  
Author(s):  
Moon Kyu Kwak ◽  
Jong G. Ok ◽  
Sung Ho Lee ◽  
L. Jay Guo
Keyword(s):  
Flexible Substrate ◽  
Large Area ◽  
Patterned Surface ◽  
Roll To Roll

Large-area micro/nano-patterns on a flexible substrate were produced using the VTT (visually tolerable tiling) method, realizing invisible seam lines between small master tiles. This could be applied in the roll-to-roll imprinting process, producing large-area polarizers and microprism sheets without visible seam lines.

Precision Gravure Printing of Conductive Ink on Flexible Substrate for Printed Electronics

2012 ◽  
Author(s):  
Deokkyun Yoon ◽  
Seung-Hyun Lee
Keyword(s):  
Printed Circuit Board ◽  
Printed Electronics ◽  
Flexible Substrate ◽  
Circuit Board ◽  
Rfid Tags ◽  
Gravure Printing ◽  
Printed Circuit ◽  
Roll To Roll ◽  
Conductive Line ◽  
Grid Mesh

In attempt to lower the production cost, roll-to-roll printing is gaining attention in electronics industries. Gravure printing, which has been the method of choice in the graphics industry for years thanks to its high resolution and process speed, is utilized to print conductive lines on flexible substrate. The main benefactors of such utilization are touch screen panel, RFID tags, thin film photovoltaics, and printed circuit board industries. The preferred substrate for conductive line printing is polymer. Due to its highly flexible nature, the printed electronics is highly flexible and is expected to create new markets where the rigid silicon and glass based electronics could not. In this work, the effect of gravure cell and trench on printing thin conductive lines as low as 20 μm line width on the polyethylene terephthalate (PET) substrate is presented. Various printing orientations including the machine direction, the cross direction, and the 45° grid mesh are used and the respective orientation’s printability is discussed.

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