Design of Normal Mode Helical Antenna for Seawater Application

Authors

  • Siti Harliza Mohd Razali Wireless Communication Centre, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor Bahru, Johor, MALAYSIA
  • Razali Ngah Wireless Communication Centre, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor Bahru, Johor, MALAYSIA
  • Kamilia Kamardin Malaysian-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, MALAYSIA
  • Yoshihide Yamada Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, 54100, MALAYSIA

Keywords:

Small antenna, seawater, self-resonance, near-field, efficiency of NMHA

Abstract

To overcome the substantial propagation loss in the ocean, a low frequency band should be chosen when contemplating radio wave communication. Then, the antenna used at the portable radio equipment should be very small compare to the wavelength. For the miniaturized antenna, the normal mode helical antenna (NMHA) is suitable because of achieving high efficiency. In this paper, design method of NMHA in the seawater condition (r=81, =4) is explained. The frequency bands of 100MHz and 15MHz are selected. The self-resonant structures are determined based on the theoretical equation. Electrical characteristics such as resonant frequency, input impedance, VWSR and antenna efficiency are obtained through simulation by FEKO simulator. Electromagnetic simulation model is formed by taking into account the practical experimental condition. At 100MHz and 15MHz, resonances are ensured for antenna diameter lengths of 6.83 cm and 12.2 cm respectively. Input resistance of 27.15 and 94.14, antenna efficiencies of -14.88dB and -26.27dB are achieved at 100MHz and 15MHz respectively.

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Published

15-08-2023

Issue

Vol. 15 No. 3 (2023): Special Issue: Electrical Engineering

Section

Special Issue 2023: MJWRT2022

License

Copyright (c) 2023 International Journal of Integrated Engineering

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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Open Access is by licensing the content with a Creative Commons (CC) license. 

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

 

How to Cite

Mohd Razali, S. H. ., Ngah, R. ., Kamardin, K. ., & Yamada, Y. . (2023). Design of Normal Mode Helical Antenna for Seawater Application. International Journal of Integrated Engineering, 15(3), 177-186. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/12888

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