Design of a Low-profile Chipless RFID tag Using a Grounded Wall

ABSTRACT

An 8-bit chipless radio-frequency identification (RFID) tag with a compact structure is proposed in this paper. Designing a RFID tag with a compact size is highly demanded in RFID technology. The original RFID tag is composed of 8 octagonal rings. In order to minimize its dimensions, the tag is divided in two equal parts. One part is completely omitted with its substrate. A grounded wall is placed in front of the remaining part to compensate the effects of the removed part and generate an image of it. Comparing a radar cross-section (RCS) of the compact and normal structure implies that by minimizing the tag, the RCS response of the structure is approximately similar with that of the normal tag. An equivalent circuit model for the RFID tag is presented, which shows a reasonable agreement with its full-wave result. The presented tag exhibits an RCS of $\mathit{\sigma }$ = −26 dBsm from 2 to 7 GHz with an overall size of 15 $\times$ 30 mm². Through using the aforementioned method, a 50% reduction in the overall area of the structure is observed.

KEYWORDS:

• Chipless RFID tag
• Equivalent circuit model
• Miniaturization
• Radar cross-section (RCS)
• Radio-frequency identification (RFID)
• Surface current distribution

Additional information

Notes on contributors

Sajjad Tijeri-Mofrad

Sajjad Tijeri-Mofrad received the BSc degree in telecommunications engineering from the University of Qom, Qom, Islamic Republic of Iran, in 2019, and is currently studying for the MSc degree in telecommunication engineering at Tarbiat Modares University, Tehran, Islamic Republic of Iran. His research interests include chipless RFID tag design, terahertz antenna design, visible light communication antenna, MIMO VLC. Email: [email protected]

S. Mohammad-Ali-Nezhad

Sajad Mohammad-Ali-Nezhad (M’15) received the BSc degree in electronic engineering from Shahid Chamran University, Ahwaz, Iran, in 2008 and the MSc and PhD degrees in communication engineering from Shahed University, Tehran, Iran, in 2010 and 2015, respectively. Currently, he is an assistant professor and the dean of the Faculty of Engineering, University of Qom, Qom, Iran. His research interests include leaky wave antennas, printed circuit antennas, array antennas, MIMO antennas, RFID chipless tag, frequency selective surface, bio-electromagnetics, electromagnetic theory, neural network, optimization, and model predictive control.

Amir Hossein Zarif

Amir Hossein Zarif received the BSc degree in telecommunications engineering from the University of Qom, Qom, Islamic Republic of Iran, in 2019, and is currently working toward the MSc degree in telecommunications engineering at Tarbiat Modares University, Tehran, Islamic Republic of Iran. His research interests include chipless RFID tag design, radio communication and Cellular communication. Email: [email protected]

M. Khorramizadeh

Mohammad Khorramizadeh received his BSc in electronic engineering from Azad University Dezful, Iran, in 2013. He received his MSc in telecommunication engineering from Shahed University, Tehran, Iran in 2016. His fields of interest include slot array antennas, printed circuit antennas, MIMO antennas, chipless RFID tag. Email: [email protected]