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A flexible broadband antenna for IoT applications

Published online by Cambridge University Press:  11 March 2020

Abdullah Al-Sehemi ,
Ahmed Al-Ghamdi ,
Nikolay Dishovsky ,
Gabriela Atanasova Open the ORCID record for Gabriela Atanasova [Opens in a new window]  and
Nikolay Atanasov Open the ORCID record for Nikolay Atanasov [Opens in a new window]
Abdullah Al-Sehemi
Affiliation:
Research Center for Advanced Materials Science, King Khalid University, Abha61413, P. O. Box 9004, Saudi Arabia Department of Chemistry, College of Science, King Khalid University, Abha61413, P. O. Box 9004, Saudi Arabia
Ahmed Al-Ghamdi
Affiliation:
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
Nikolay Dishovsky
Affiliation:
Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 1756Sofia, Bulgaria
Gabriela Atanasova*
Affiliation:
Department of Communication and Computer Engineering, Faculty of Engineering, South-West University ‘Neofit Rilski’, 2700Blagoevgrad, Bulgaria
Nikolay Atanasov
Affiliation:
Department of Communication and Computer Engineering, Faculty of Engineering, South-West University ‘Neofit Rilski’, 2700Blagoevgrad, Bulgaria Electromagnetic Compatibility Laboratory, Bulgarian Institute of Metrology, 1040, Sofia, Bulgaria
*
Author for correspondence: Gabriela Atanasova, E-mail: gatanasova@windowslive.com; gatanasova@swu.bg
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Abstract

A flexible broadband antenna with high radiation efficiency for the Internet of Things (IoT) applications is presented. The design is based on a U-shaped and a triangular-shaped radiator with two tuning stubs. A 50 Ω coplanar waveguide (CPW) transmission line is employed to feed the antenna. The proposed antenna is fabricated on a flexible substrate from a composite synthesized by mixing natural rubber with SiO2 as a filler. The radiating elements, along with the CPW, are built using a highly conductive woven fabric. Results show that the antenna has a simulated and measured impedance bandwidth of 0.856–2.513 GHz and covers the most commonly used wireless communication standards and technologies for IoT applications. The radiation efficiency of the antenna reaches over 75% throughout the operating frequency band with satisfactory radiation patterns and gain. The flexible antenna was also tested under bending conditions. The presented results demonstrate that bending has a minor effect on the antenna performance within the target frequency range. The measured results show a good agreement with simulations.

Keywords

Antenna for IoTantenna designantenna modelingantenna measurementbroadband antennaflexible antenna
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 6: EuCAP 2019 Special Issue , July 2020 , pp. 531 - 540
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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