Design of Normal Mode Helical Antenna for Seawater Application

IF 0.4 Q4 ENGINEERING, MULTIDISCIPLINARY

International Journal of Integrated Engineering Pub Date : 2023-07-31 DOI:10.30880/ijie.2023.15.03.018

Siti Harliza Mohd Razali, R. Ngah, K. Kamardin, Yoshihide Yamada

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引用次数: 0

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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海水常模螺旋天线的设计

为了克服在海洋中大量的传播损耗，在考虑无线电波通信时应选择较低的频段。然后，便携式无线电设备上使用的天线与波长相比应该非常小。对于小型化天线，正模螺旋天线(NMHA)因其效率高而适合。本文阐述了海水条件下NMHA的设计方法(15r =81, 15r =4)。选择100MHz和15MHz频段。根据理论方程确定了自谐振结构。通过FEKO模拟器仿真得到了谐振频率、输入阻抗、虚波比和天线效率等电学特性。结合实际实验条件，建立了电磁仿真模型。在100MHz和15MHz频段，天线直径分别为6.83 cm和12.2 cm时，可以保证共振。输入电阻为27.15和94.14，在100MHz和15MHz时的天线效率分别为-14.88dB和-26.27dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Integrated Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.40

自引率

0.00%

发文量

期刊介绍： The International Journal of Integrated Engineering (IJIE) is a single blind peer reviewed journal which publishes 3 times a year since 2009. The journal is dedicated to various issues focusing on 3 different fields which are:- Civil and Environmental Engineering. Original contributions for civil and environmental engineering related practices will be publishing under this category and as the nucleus of the journal contents. The journal publishes a wide range of research and application papers which describe laboratory and numerical investigations or report on full scale projects. Electrical and Electronic Engineering. It stands as a international medium for the publication of original papers concerned with the electrical and electronic engineering. The journal aims to present to the international community important results of work in this field, whether in the form of research, development, application or design. Mechanical, Materials and Manufacturing Engineering. It is a platform for the publication and dissemination of original work which contributes to the understanding of the main disciplines underpinning the mechanical, materials and manufacturing engineering. Original contributions giving insight into engineering practices related to mechanical, materials and manufacturing engineering form the core of the journal contents.