Design, simulation, and fabrication of low-cost chipless rfid tags

Çetin, Elif
In this thesis, low-cost chipless radio-frequency-identification (RFID) tags are investigated. These types of tags are proposed and developed to replace barcodes in item-level tagging. In addition to the standard methods using printed circuit boards (PCBs), chipless RFID tags are suitable to be fabricated via low-cost inkjet printing. In these low-cost fabrications, tags are printed on photopapers via commercial inkjet printers loaded with silver-based inks. Various tag designs are simulated via the multilevel fast multipole algorithm (MLFMA) and their radar-cross-section (RCS) values are rigorously studied to developed superior designs for high performance identifications. This study particularly focuses on frequency-based chipless RFID tag designs, where data is encoded via resonators. Existences of the resonators induce resonance peaks at the backscattered RCS response of the tag such that the data is encoded in binary notation depending on the resonators’ absence or presence. In other words, tags having different ID words generate different signatures in the RCS spectrum. To construct an RFID system, RCS responses are collected in an ID library, while the tags that yield poor RCS responses are removed from the library based on an elimination rule. In addition to the conventional tags, novel array strategies are investigated to increase the reliability and readability of the tags at the cost of reduced compactness. Furthermore, novel hourglass structures, which have more compact forms and enhanced RCS performances in comparison to the standard structures, are investigated. Finally, fabricated tags are tested in anechoic chamber by using various calibration techniques. While satisfactory results are obtained with PCB-based tags, improvements are needed to construct RFID systems involving inkjet-printed tags.


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Mutlu, Feza; Demir, Mehmet Alper; Ergül, Özgür Salih (2018-11-02)
Using embedded microchips on radio-frequency identification (RFID) tags requires difficult mounting processes and increases the tag price. Therefore, chipless RFID tags have been introduced in the literature. In this paper, an improved series of chipless RFID letter-type tags are introduced. Each letter has unique characteristics that can be identified clearly, thanks to the well-designed slits opened to improve its electromagnetic response without sacrificing legibility. Simulations are realized for 150-po...
Numerical Study of Chipless Tags for Radio-Frequency-Identification (RFID) Applications
Cetin, Elif; ŞAHİN, MELİN; Ergül, Özgür Salih (2019-01-01)
We present a numerical investigation of effective chipless tags for radio-frequency-identification (RFID) applications. Chipless tags have been introduced recently as alternatives to standard tags with microchips. While they can significantly reduce the overall cost of RFID systems by eliminating microchips and procedures to mount them on tags, chipless tags bring new challenges, especially in terms of identification reliability. We focus on tag structures that consist of resonators and consider alternative...
Design of Highly Distinguishable Letters for Inkjet-Printed Chipless RFID Tags
DEMIR, MEHMET ALPER; MUTLU, FEZA; Ergül, Özgür Salih (2018-09-14)
We consider chipless tags, which are based on Latin letters and also legible, for radio-frequency-identification (RFID) applications. Since letters using standard fonts have relatively weak and smooth responses with respect to frequency, special slits are designed to improve the distinguishability of letters without sacrificing their legibility. The designed set of letters can be used to generate words that are also suitable for RFID applications with their strong and unique scattering characteristics. The ...
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Dolapci, Turker; Mutlu, Feza; Ergül, Özgür Salih (2017-09-27)
We present design and computational analysis of log-periodic antennas that are fabricated by using low-cost inkjet printing technology. The designed antennas operate in the 1.5-2.5 GHz range and are suitable for diverse applications, including energy harvesting at WiFi and GSM bands. Suitable designs are fabricated by using silver-based inks in standard commercial printers. Despite the challenges in both design and fabrication processes, we demonstrate log-periodic antennas with desired operating properties...
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In this thesis, the feasibility of deploying RFID technologies in the case of “lowvolume high-value” products is considered by focusing on the production processes of a real company. First, the processes of the company are examined and associated problems are determined. Accordingly, a simulation of the current situation is constructed by using the discrete event simulation technique, in order to obtain an accurate model. In addition to modeling the current situation, this simulation model provides a flexib...
Citation Formats
E. Çetin, “Design, simulation, and fabrication of low-cost chipless rfid tags,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2019.