A fully passive 10-digit numeric keypad sensor using chipless RFID technology

Haider, U. A., Noman, M., Ullah, H., Abutarboush, H. F., Abbasi, Q. H. and Tahir, F. A. (2023) A fully passive 10-digit numeric keypad sensor using chipless RFID technology. IEEE Sensors Journal, 23(3), pp. 2978-2987. (doi: 10.1109/JSEN.2022.3232154)

Abstract

A 10-digit chipless RFID (CRFID) based numeric keypad that works on the principle of touch event sensing is presented. The tag is designed to operate using passive frequency domain technique. The proposed tag has ten circular resonator rings for each of the keypad’s corresponding decimal digit. Each circular ring resonates at a particular frequency within 400 MHz band from 2.7-7.6 GHz to uniquely identify a digit. Identification is performed by decoding RCS response of the whole keypad tag. A customized human finger using standard tissue characteristics is modelled to verify the keypad’s working mechanism. When the finger is placed on any of the nine resonator its corresponding resonance disappears from the allocated band. The proposed CRFID keypad Sensor tag is built upon a Rogers substrate of 85×95×0.8 mm 3 volume. The backside of the proposed tag is fully copper filled for an easy interface with a variety of backgrounds including metallic walls. The design exactly mimics the shape of ordinary keypad. The finger model used in the simulations realizes the practical scenario. This CRFID keypad is deemed an intriguing solution for future automated cities and will help in the conceptualization of IoT systems.

• Item Type: Articles
• Additional Information: This research was funded by Higher Education Commission of Pakistan under Grant No. 10038/Federal/NRPU/R&D/HEC.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Abbasi, Professor Qammer
• Authors: Haider, U. A., Noman, M., Ullah, H., Abutarboush, H. F., Abbasi, Q. H., and Tahir, F. A.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Sensors Journal
• Publisher: IEEE
• ISSN: 1530-437X
• ISSN (Online): 1558-1748
• Published Online: 04 January 2023
• Copyright Holders: Copyright © 2022 IEEE
• First Published: First published in IEEE Sensors Journal 23(3): 2978-2987
• Publisher Policy: Reproduced in accordance with the publisher copyright policy