Design of Highly Distinguishable Letters for Inkjet-Printed Chipless RFID Tags

Ergül, Özgür Salih
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 tags are fabricated via low-cost inkjet printing, making them both flexible and inexpensive.


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...
Improved Fonts for Chipless Radio-Frequency-Identification Tags Based on Letters
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...
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...
Improved ADMM-Based Algorithm for Multi-Group Multicast Beamforming in Large-Scale Antenna Systems
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2018-08-07)
In this paper, we consider beamformer design for multi-group multicasting where a common message is transmitted to the users in each group. We propose a novel effective alternating direction method of multipliers (ADMM) formulation in order to reduce the computational complexity of the existing state-of-the-art algorithm for multi-group multicast beamforming with per-antenna power constraints. The proposed approach is advantageous for the scenarios where the dimension of the channel matrix is less than the ...
Citation Formats
M. A. DEMIR, F. MUTLU, and Ö. S. Ergül, “Design of Highly Distinguishable Letters for Inkjet-Printed Chipless RFID Tags,” 2018, Accessed: 00, 2020. [Online]. Available: