University of Oulu

S. K. Noor, A. M. Ismail, M. N. M. Yasin, M. N. Osman, T. Sabapathy et al., "Higher order oam mode generation using wearable antenna for 5g nr bands," Computer Systems Science and Engineering, vol. 47, no.1, pp. 537–551, 2023.

Higher order OAM mode generation using wearable antenna for 5G NR bands

Saved in:
Author: Khan Noor, Shehab1; Mawardi Ismail, Arif1; Najib Mohd Yasin, Mohd1;
Organizations: 1Advanced Communication Engineering (ACE), Centre of Excellence, Faculty of Electronic Engineering & Technology, Universiti Malaysia Perlis, Kangar, Perlis, Malaysia
2Faculty of Engineering Technology (FTK), Department of Electronic Engineering Technology, Universiti Malaysia Perlis (UniMAP), Unicity Alam Campus, 02100, Padang Besar, Perlis, Malaysia
3Centre for Wireless Communications (CWC), University of Oulu, 90570, Oulu, Finland
4Department of Electrical Engineering, Universitas Sumatera Utara, Medan, 20155, Indonesia
5Centre for Advanced Electrical and Electronic System (CAEES) Faculty of Engineering, Built Environment and Information Technology, SEGi University Selangor, Malaysia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
Persistent link:
Language: English
Published: Tech Science Press, 2023
Publish Date: 2023-08-21


This paper presents a flexible and wearable textile array antenna designed to generate Orbital Angular Momentum (OAM) waves with Mode +2 at 3.5 GHz (3.4 to 3.6 GHz) of the sub-6 GHz fifth-generation (5G) New Radio (NR) band. The proposed antenna is based on a uniform circular array of eight microstrip patch antennas on a felt textile substrate. In contrast to previous works involving the use of rigid substrates to generate OAM waves, this work explored the use of flexible substrates to generate OAM waves for the first time. Other than that, the proposed antenna was simulated, analyzed, fabricated, and tested to confirm the generation of OAM Mode +2. With the same design, OAM Mode −2 can be generated readily simply by mirror imaging the feed network. Note that the proposed antenna operated at the desired frequency of 3.5 GHz with an overall bandwidth of 400 MHz in free space. Moreover, mode purity analysis is carried out to verify the generation of OAM Mode +2, and the purity obtained was 41.78% at free space flat condition. Furthermore, the effect of antenna bending on the purity of the generated OAM mode is also investigated. Lastly, the influence of textile properties on OAM modes is examined to assist future researchers in choosing suitable fabrics to design flexible OAM-based antennas. After a comprehensive analysis considering different factors related to wearable applications, this paper demonstrates the feasibility of generating OAM waves using textile antennas. Furthermore, as per the obtained Specific Absorption Rate (SAR), it is found that the proposed antenna is safe to be deployed. The findings of this work have a significant implication for body-centric communications.

see all

Series: Computer systems science & engineering
ISSN: 0267-6192
ISSN-L: 0267-6192
Volume: 47
Issue: 1
Pages: 537 - 551
DOI: 10.32604/csse.2023.037381
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by Ministry of Higher Education through the Fundamental Research Grant Scheme (FRGS) under a grant number of FRGS/1/2020/ICT09/UNIMAP/02/2.
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.