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Review

Bending Analysis of Polymer-Based Flexible Antennas for Wearable, General IoT Applications: A Review

1
School of Electrical Computer and Telecommunication Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
2
Westgerman Heart and Vascular Center, University of Duisburg-Essen, 45122 Essen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jea Uk Lee
Polymers 2021, 13(3), 357; https://doi.org/10.3390/polym13030357
Received: 22 December 2020 / Revised: 14 January 2021 / Accepted: 18 January 2021 / Published: 22 January 2021
(This article belongs to the Special Issue Advances in Smart Textile)
Flexible substrates have become essential in order to provide increased flexibility in wearable sensors, including polymers, plastic, paper, textiles and fabrics. This study is to comprehensively summarize the bending capabilities of flexible polymer substrate for general Internet of Things (IoTs) applications. The basic premise is to investigate the flexibility and bending ability of polymer materials as well as their tendency to withstand deformation. We start by providing a chronological order of flexible materials which have been used during the last few decades. In the future, the IoT is expected to support a diverse set of technologies to enable new applications through wireless connectivity. For wearable IoTs, flexibility and bending capabilities of materials are required. This paper provides an overview of some abundantly used polymer substrates and compares their physical, electrical and mechanical properties. It also studies the bending effects on the radiation performance of antenna designs that use polymer substrates. Moreover, we explore a selection of flexible materials for flexible antennas in IoT applications, namely Polyimides (PI), Polyethylene Terephthalate (PET), Polydimethylsiloxane (PDMS), Polytetrafluoroethylene (PTFE), Rogers RT/Duroid and Liquid Crystal Polymer (LCP). The study includes a complete analysis of bending and folding effects on the radiation characteristics such as S-parameters, resonant frequency deviation and the impedance mismatch with feedline of the flexible polymer substrate microstrip antennas. These flexible polymer substrates are useful for future wearable devices and general IoT applications. View Full-Text
Keywords: polymers substrates; flexible electronics; flexible antennas; internet of things (IoTs); wearable applications polymers substrates; flexible electronics; flexible antennas; internet of things (IoTs); wearable applications
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MDPI and ACS Style

Ali Khan, M.U.; Raad, R.; Tubbal, F.; Theoharis, P.I.; Liu, S.; Foroughi, J. Bending Analysis of Polymer-Based Flexible Antennas for Wearable, General IoT Applications: A Review. Polymers 2021, 13, 357. https://doi.org/10.3390/polym13030357

AMA Style

Ali Khan MU, Raad R, Tubbal F, Theoharis PI, Liu S, Foroughi J. Bending Analysis of Polymer-Based Flexible Antennas for Wearable, General IoT Applications: A Review. Polymers. 2021; 13(3):357. https://doi.org/10.3390/polym13030357

Chicago/Turabian Style

Ali Khan, Muhammad U., Raad Raad, Faisel Tubbal, Panagiotis I. Theoharis, Sining Liu, and Javad Foroughi. 2021. "Bending Analysis of Polymer-Based Flexible Antennas for Wearable, General IoT Applications: A Review" Polymers 13, no. 3: 357. https://doi.org/10.3390/polym13030357

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