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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 3476017, 8 pages
https://doi.org/10.1155/2017/3476017
Research Article

Wearable Passive E-Textile UHF RFID Tag Based on a Slotted Patch Antenna with Sewn Ground and Microchip Interconnections

1Department of Electronics and Communications Engineering, Tampere University of Technology, Tampere, Finland
2Department of Electronic Engineering, City University of Hong Kong, Hong Kong

Correspondence should be addressed to Johanna Virkki

Received 21 September 2016; Accepted 22 January 2017; Published 13 February 2017

Academic Editor: Ming-Chun Tang

Copyright © 2017 Johanna Virkki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present a wearable passive UHF RFID tag based on a slotted patch antenna comprising only textile materials (e-textile, textile substrate, and conductive yearn). As a novel manufacturing approach, we realize the patch-to-ground and antenna-to-IC interfaces using only conductive thread and a sewing machine. We outline the electromagnetic optimization of the antenna for body-worn operation through simulations and present a performance comparison between the e-textile tag and a tag produced using regular electronics materials and methods. The measured results show that the textile tag achieves the electrical performance required in practical applications and that the slotted patch type antenna provides stable electromagnetic performance in different body-worn configurations.