University of Oulu

K. Zhang, P. J. Soh and S. Yan, "Design of a Compact Dual-Band Textile Antenna Based on Metasurface," in IEEE Transactions on Biomedical Circuits and Systems, vol. 16, no. 2, pp. 211-221, April 2022, doi: 10.1109/TBCAS.2022.3151243

Design of a compact dual-band textile antenna based on metasurface

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Author: Zhang, Kai1; Soh, Ping Jack2; Yan, Sen1
Organizations: 1School of Information and Communi- cations Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
2Centre for Wireless Communications, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-05-16


This paper presents a compact textile antenna design based on a metasurface for wearable applications. It operates in the 2.45 GHz and 5.5 GHz industrial, scientific, and medical bands. A two-dimensional equivalent circuit model is proposed to provide insight into the working principle of the metasurface. The tuning of the radiator’s resonant frequencies can be easily performed by adjusting the dispersion curve of the metasurface unit cell. The metasurface in this work consists of a 4 × 4 array of unit cells fed by a printed coplanar waveguide structure with a slot in its reverse side to maintain its low profile structure. The main innovations of this work are: (i) the −2nd mode is employed to significantly miniaturize the antenna dimensions; (ii) the simultaneous excitation of the +1st mode to enable dual-band operation; (iii) an integrated back reflector to reduce back radiation and lower SAR; and (iv) the use of full textile materials to guarantee user comfort, ease of fabrication and low cost. The proposed antenna’s footprint is 44.1 × 44.1 mm² (0.12 λ² at 2.45 GHz), with an impedance bandwidth of 10.2% centered at 2.45 GHz and 22.5% at 5.5 GHz. The maximum gain is −0.67 dBi and 7.4 dBi in free space, and 9% of power gain attenuation is generated when used on the body, and is suitable as a miniaturized antenna for wearable applications.

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Series: IEEE transactions on biomedical circuits and systems
ISSN: 1932-4545
ISSN-E: 1940-9990
ISSN-L: 1932-4545
Volume: 16
Issue: 2
Pages: 211 - 221
DOI: 10.1109/TBCAS.2022.3151243
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the National Natural Science Foundation, China, under Grant 61901351. The work of Ping Jack Soh was support by the Academy of Finland 6 Genesis Flagship under Grant 318927.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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