Improved Fonts for Chipless Radio-Frequency-Identification Tags Based on Letters

Mutlu, Feza
Demir, Mehmet Alper
Ergül, Özgür Salih
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-point Calibri letters, which are also suitable for low-cost inkjet printing, excited with different polarizations. Various types of slits are investigated on the letters to achieve more reliable identification of the corresponding tags. A comparative analysis based on backscattered radar cross section and current distribution results is presented.


Design, simulation, and fabrication of low-cost chipless rfid tags
Çetin, Elif; Ergül, Özgür Salih; Department of Electrical and Electronics Engineering (2019)
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 multile...
Novel Inkjet-Printed Chipless Tags for Radio-Frequency-Identification Applications
Cetin, Elif; Sailin, M. Baris; Ergül, Özgür Salih (2019-09-01)
In radio-frequency-identification (RFID) systems, chipless tags, i.e., tags without microchips, are desirable in comparison to their more common counterparts involving microchips. This is not merely due to the extra costs of microchips but also due to relatively difficult mounting processes to attach microchips onto metallic antennas, which in fact becomes challenging if tags are produced via inkjet printing methods. In the context of paper-based inkjet printing, absence of microchips is also attractive for...
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...
Reconfigurable antenna structure for RFID system applications using varactor-loading technique
Sevinç, Yusuf; Kaya, Adnan (2012-01-01)
A novel method is presented for electrically tuning the frequency of a compact radio-frequency identification (RFID) tag antenna. A tuning circuit, comprising a radio frequency (RF) switch and discrete passive components, was completely integrated into the antenna element, which is thus free of DC wires. The low-profile printed antennas were fabricated together with the layouts of the DC control circuits and other RF/baseband circuit footprints. A surface-mounted varactor was applied as a frequency-tuning e...
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 ...
Citation Formats
F. Mutlu, M. A. Demir, and Ö. S. Ergül, “Improved Fonts for Chipless Radio-Frequency-Identification Tags Based on Letters,” 2018, Accessed: 00, 2020. [Online]. Available: