Journal of Applied Science and Engineering

Published by Tamkang University Press


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Yi Lin Chan1, Kok Yeow You2, Mohd Zul Hilmi Mayzan1, Mohamad Ashry Jusoh3, Zulkifly Abbas4, and Fahmiruddin Esa This email address is being protected from spambots. You need JavaScript enabled to view it.1

1Material Physics Laboratory, Department of Physics and Chemistry, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, 84600 Pagoh, Muar, Johor, Malaysia
2Radar Laboratory, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
3Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang, Malaysia
4RF Microwave Laboratory, Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, 43400 Seri Kembangan, Selangor, Malaysia 


Received: May 9, 2019
Accepted: November 5, 2019
Publication Date: December 1, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Composite absorbing material is a branch of study that relates electromagnetic compatibility to radio and microwave frequency applications. Thus, many researchers have been made to focus on the composite fabrication and its characteristic of microwave signal performance. Generally, a light weight, high absorption and low cost absorber is highly demanded. Therefore, this work aims to investigate the return loss (RL) characteristics of graphene oxide/zinc ferrite/epoxy composite in the range of frequency 8.2 GHz to 12.4 GHz. The structural patterns of graphene oxide (GO) and Zn ferrite (ZnFe2O4) were confirmed by X-ray diffraction (XRD). Surface morphologies of the composites were characterized by Coxem Table Top SEM equipped with an energy dispersive spectroscopy (EDS) system and the tracing elements were identified. The bulk density of ZnFe2O4 could be reduced by addition of GO based on the measurement results. Electromagnetic properties were calculated using Nicolson-Ross-Weir (NRW) conversion technique based on measured S-parameters by vector network analyzer (VNA). Complex relative permittivity increases as the GO content increases due to the increment of dipolar polarization whereas a minor change occurred in permeability. Generally, the dissipation factor happens in the range of 10 – 11 GHz for both properties. A minimum RL is found to be -12.7 dB at 10.5 GHz with 2.35 mm for 3-GO-ZnFe2O4 composite sample. The RL performance of the sample could be tuned as low as -55 dB using higher thickness samples.

Keywords: Graphene oxide; Zinc ferrite; Composite materials; Return loss; Electromagnetic properties


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