University of Oulu

N. A. Koma’rudin, Z. Zakaria, A. A. Althuwayb, H. Lago, H. Alsariera et al., "Directional wideband wearable antenna with circular parasitic element for microwave imaging applications," Computers, Materials & Continua, vol. 72, no.1, pp. 983–998, 2022,

Directional wideband wearable antenna with circular parasitic element for microwave imaging applications

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Author: Koma’rudin, N. A.1; Zakaria, Z.1; Althuwayb, A. A.2;
Organizations: 1Faculty of Electronic and Computer Engineering (FKEKK), Universiti Teknikal Malaysia Melaka (UTeM), Durian Tunggal, 76100, Melaka, Malaysia
2Electrical Engineering Department, Jouf University, Sakaka, 72388, Aljouf, Kingdom of Saudi Arabia
3Faculty of Engineering, Universiti Malaysia Sabah (UMS), Kota Kinabalu, 88400, Sabah, Malaysia
4Centre for Wireless Communications (CWC), University of Oulu, Oulu, 90014, Finland
5Advanced Communication Engineering (ACE) CoE, Faculty of Electronic Engineering Technology, Universiti Malaysia Perlis (UniMAP), Arau, 02600, Perlis, Malaysia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Tech Science Press, 2022
Publish Date: 2022-05-18


This work proposes a wideband and unidirectional antenna consisting of dual layer of coplanar waveguide based on the circular parasitic element technique. The design procedure is implemented in three stages: Design A, which operates at 3.94 GHz with a bandwidth of 3.83 GHz and a fractional bandwidth (FBW) of 97.2%; Design B, which operates at 3.98 GHz with a bandwidth of 0.66 GHz (FBW of 56.53%); and Design C as the final antenna. The final Design C is designed to resonate at several frequencies between 2.89 and 7.0 GHz for microwave imaging applications with a bandwidth of 4.11 GHz (79.8%) centered at 5.15 GHz. This antenna is fabricated fully using two textile materials: felt as the substrate and ShieldIt as the conductor. It features a unidirectional radiation with a gain of 5.5 dBi, and reduced low back radiation from 2.06 to−7.81 dB. The front-to-back ratio (FBR) for Design A, Design B and Design C are 4.82, 2.94 and 11.36 dB, respectively. This antenna is wideband with unidirectional radiation, lightweight, and flexible.

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Series: Computers, materials & continua
ISSN: 1546-2218
ISSN-E: 1546-2226
ISSN-L: 1546-2218
Volume: 72
Issue: 1
Pages: 983 - 998
DOI: 10.32604/cmc.2022.024782
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the Malaysia Public Service Department (JPA) and Universiti Teknikal Malaysia Melaka (UTeM) under Jurnal/2020/FKEKK/Q00053. P. J. Soh acknowledges the support from the Academy of Finland 6Genesis Flagship (Grant No. 318927).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
Copyright information: This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.