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Directional Wideband Wearable Antenna with Circular Parasitic Element for Microwave Imaging Applications

N. A. Koma'rudin1, Z. Zakaria1,*, A. A. Althuwayb2, H. Lago3, H. Alsariera1, H. Nornikman1, A. J. A. Al-Gburi1, P. J. Soh4,5

1 Faculty of Electronic and Computer Engineering (FKEKK), Universiti Teknikal Malaysia Melaka (UTeM), Durian Tunggal, 76100, Melaka, Malaysia
2 Electrical Engineering Department, Jouf University, Sakaka, 72388, Aljouf, Kingdom of Saudi Arabia
3 Faculty of Engineering, Universiti Malaysia Sabah (UMS), Kota Kinabalu, 88400, Sabah, Malaysia
4 Centre for Wireless Communications (CWC), University of Oulu, Oulu, 90014, Finland
5 Advanced Communication Engineering (ACE) CoE, Faculty of Electronic Engineering Technology, Universiti Malaysia Perlis (UniMAP), Arau, 02600, Perlis, Malaysia

* Corresponding Author: Z. Zakaria. Email: email

(This article belongs to this Special Issue: Advances in 5G Antenna Designs and Systems)

Computers, Materials & Continua 2022, 72(1), 983-998.


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.


Cite This Article

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.

cc 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.
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