University of Oulu

J. Chen, M. Berg, V. Somero, H. Y. Amin and A. Pärssinen, "A multiple antenna system design for wearable device using theory of characteristic mode," 12th European Conference on Antennas and Propagation (EuCAP 2018), London, 2018, pp. 1-5. doi: 10.1049/cp.2018.0430

A multiple antenna system design for wearable device using theory of characteristic mode

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Author: Chen, J.1; Berg, M.1; Somero, V.2;
Organizations: 1Center for Wireless Communications, University of Oulu, Oulu, Finland
2Polar Electro Oy, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
Persistent link:
Language: English
Published: Institute of Electrical and Electronics Engineers, 2018
Publish Date: 2018-12-18


In this paper, a wearable three-antenna system aiming for cellular Internet of Things (IoT) applications is proposed. The presented antenna system consists of two cellular antennas (LTE low- and mid-band antennas) and one GPS antenna designed by using the Theory of Characteristic Mode (TCM). Both the simulated and measured results with good agreements are provided in this work. As a result of successful excitation of chassis modes, the proposed cellular antennas can cover the desired cellular bands between 699–862 MHz and 1710–2155 MHz with corresponding wideband matching circuits. Meanwhile, the proposed GPS antenna operates with a good right hand circular polarization (RHCP) performance (at least 5 dB higher gain than left hand circular polarization (LHCP)). Reasonable isolation performances among three antennas are also gained due to utilization of orthogonal modes. The results also show that with the proximity of human body (wrist phantom), over the wideband operation bands all antennas can achieve good efficiency. The averaged levels of −10 dB, −6 dB, and −4 dB, respectively for LTE low band, mid band and GPS band are achieved, indicating its potential in future wearable cellular IoT applications.

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Series: IEEE Proceedings of the European Conference on Antennas and Propagation
ISSN: 2164-3342
ISSN-L: 2164-3342
ISBN: 978-1-78561-816-1
ISBN Print: 978-1-78561-815-4
Pages: 1 - 5
DOI: 10.1049/cp.2018.0430
Host publication: 2018 12th European conference on antennas and propagation (EUCAP)
Conference: European Conference on Antennas and Propagation
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was done in WERME research project financially supported by Hilla research program. Authors acknowledge project partnering companies for the enthusiastic and fruitful collaboration
Copyright information: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.