Novel flexible chipless RFID tags based on five state resonators

Abstract

In this paper, novel chipless radio frequency identification (RFID) tags are designed by using asymmetrical triple mode resonators constructed by an open loop resonator with two open stubs in different lengths. Three transmission zeros (bits) can be obtained by coupling a proposed resonator to a straight feeding line that connects input/output ports. Five frequency codes can be achieved with respect to the existence of the open stubs and the open loop resonator. By coupling eight asymmetrical triple mode resonators to the feeding line, a multi-resonant circuit is developed on a flexible substrate of Rogers 5870. Totally 24 bit frequencies can be achieved and it is possible to identify 5⁸ different items. For the chipless RFID tags, two monopole wideband antennas in vertical/horizontal polarizations are integrated instead of the input/output ports. Two tags have been fabricated and tested to demonstrate the identification of different codes under smoothed and curved positions successfully.

KEYWORDS:

• Chipless RFID tag
• flexible substrate
• monopole antenna
• triple mode resonator

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under Grant 119E476.

Notes on contributors

Engin Dogan

Engin Dogan (Student Member, IEEE) was born in Aydın, Turkey, in 1993. He received the BSc degree in electrical and electr onics engineering from Pamukkale University, Denizli, Turkey, in 2016, and the MSc degree in electrical and electronics engineering from Nigde Omer Halisdemir University, Nigde, Turkey, in 2019, where he is currently pursuing the PhD degree. He has been working as a Research Assistant at the Department of Electrical and Electronics Engineering, Nigde Omer Halisdemir University. His research interests are tunable filters, multiband filters and chipless RFID tags.

Ali Kursad Gorur

Ali Kursad Gorur was born in Kayseri, Turkey, in 1986. He received the BSc degree in Electrical and Electronics Engineering from Hacettepe University, Turkey, in 2009. He also received the MSc and PhD degrees in Electrical and Electronics Engineering from Pamukkale University, Turkey, in 2011 and 2016, respectively. He was with the Department of Electrical and Electronics Engineering, Pamukkale University, Turkey, as a Research Assistant from 2011 to 2016. He joined the Department of Electrical and Electronics Engineering, Nevsehir Haci Bektas Veli University, Turkey in 2016 as an Assistant Professor. He has been still working here as an Associate Professor since 2018. His current research interests are tunable/multi-band planar filters, multiplexers, balun bandpass filters for wireless communication systems and chipless RFID tags.

Adnan Gorur

Adnan Gorur was born in Hatay, Turkey, in 1961. He received the BSc degree in electronics engineering in 1983 from Erciyes University, Kayseri, Turkey, and the MSc degree in 1987 from Uludağ University, Bursa, Turkey, and the PhD degree from Erciyes University, Kayseri, Turkey, in 1992. He was appointed as a Research Assistant in the Department of Electronics Engineering at Erciyes University, in July 1984. He became an Assistant Professor in 1992. In July 1995, he joined the Department of Electrical and Electronics Engineering at Niğde University, Turkey. He became an Associate Professor and a full Professor in the Department of Electrical and Electronics Engineering, Niğde University, in 1995 and 2005, respectively. His current research interests include microwave circuits, slow-wave structures, and microstrip filters. He has authored or co-authored over 100 publications. His papers have been cited over 1300 times. Adnan Görür is still working in the department of electrical and electronics engineering at Niğde Ömer Halisdemir University (formerly Niğde University).