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Low-profile wideband miniaturized tag antenna mounted on the human body

Published online by Cambridge University Press:  06 June 2023

Minh-Tan Nguyen ,
Yi-Fang Lin ,
Chien-Hung Chen Open the ORCID record for Chien-Hung Chen [Opens in a new window] ,
Chin-Cheng Chang  and
Hua-Ming Chen Open the ORCID record for Hua-Ming Chen [Opens in a new window]
Minh-Tan Nguyen
Affiliation:
Institute of Photonics Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan Institute of Research and Applied Technological Science, Dong Nai Technology University, Dong Nai, Vietnam
Yi-Fang Lin
Affiliation:
Institute of Photonics Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan
Chien-Hung Chen
Affiliation:
Department of Avionics Engineering, ROC Air Force Academy, Kaohsiung, Taiwan
Chin-Cheng Chang
Affiliation:
Institute of Photonics Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan
Hua-Ming Chen*
Affiliation:
Institute of Photonics Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan
*
Corresponding author: Hua-Ming Chen; Email: hmchen@nkust.edu.tw
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Abstract

In this study, a novel, cost-effective miniaturized tag antenna was developed for applications on the human body. To achieve impedance matching with the complex conjugate impedance of the Monza-4 tag chip (7.17–j74.22 Ω at 915 MHz), the proposed structure was configured by coarsely tuning the positions of vias and fine-tuning the small gaps of its coupled patches. For further reducing the profile and dimensions of the antenna, a design technique based on the three-dimensional dipole antenna current distribution was used. The proposed antenna configuration was not only miniaturized but also achieved a long stable reading distance (>5.0 m) and a wide impedance bandwidth of 71 MHz or 7.65% (covering the ultrahigh frequency radio frequency identification ranges in most regions), regardless of the location of the tag on the human body. Experiments were conducted to validate the simulated results, and adequate agreement was found between the simulated results and the measured results.

Keywords

miniature radio frequency identification tagthree-dimensional dipole antennawideband tag antenna
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 14
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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