淡水中无线电传播的电磁分析及433 MHz轴向型螺旋天线测量

IF 3.6 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Afiza Nur Binti Jaafar;Hajar Ja’Afar;Yoshihide Yamada;Nurul Huda Abd Rahman;Naobumi Michishita;Norsiha Zainudin;Fatemeh Sedeghikia;Rina Abdullah
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引用次数: 0

摘要

在下一代6G移动系统中,通信网络将扩展到水下区域。水下包括海水和淡水区域。最近,对淡水通讯工具的需求正在增加,特别是在遥感、监测、水产养殖和湖泊和河流的监测业务方面。以往的研究仅限于传播衰减和低增益天线配置的一些实验数据。以前,由于天线在水中的性能分析不清楚,无线电链路的设计不能很好地讨论。本文阐述了水下天线的设计和电性能。然后,利用电磁仿真分析了水下电场分布,阐明了无线电链路的设计方程。ISM频段选择433mhz的频率。对于高增益天线,考虑到结构简单和适应变匝数增益变化的特点,选择了轴向型螺旋天线。天线被放置在一个胶囊中,以防止与周围的水直接接触。为了获得有效的天线增益,可以用零电导率的蒸馏水填充胶囊。在无线电传播分析中,比较了仿真结果和理论结果在距离上的功率密度衰减增量。仿真结果与理论结果吻合较好,保证了天线增益在水中条件下的有效性。为了验证链路设计方程,对天线的发射和接收条件进行了仿真。阐明了弗里斯传动公式对连杆设计方程的适用性。最后,将1.2 m深度游泳池的传播测量结果与仿真结果进行了比较。注意到水面反射干扰传播衰减。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electromagnetic Analysis of Radio Propagation in Fresh Water and Measurement by Axial Mode Helical Antenna at 433 MHz
In the next generation of 6G mobile system, communication network will be extending to the underwater area. Underwater comprises of seawater and freshwater areas. Recently, the need of communication tools in freshwater are rising particularly in remote sensing, monitoring, aquaculture and surveillance operations in lakes and rivers. Previous studies were limited to some experiment data in propagation attenuation and low-gain antenna configurations. Previously, because antenna performances in the water condition was not clearly analysed, radio link design could not well discuss. In this paper, antenna design and electrical performance in underwater use is clarified. Then, analysis of electric field distributions underwater and radio link design equation are clarified using electromagnetic simulations. A frequency of 433 MHz is selected from the ISM band. For a high gain antenna, an axial mode helical antenna is selected because of structural simplicity and adaptability of gain change by changing number of turns. The antenna is placed in a capsule to prevent direct contact with surrounding water. In order to achieve effective antenna gain, it is shown to fill the capsule with distilled water of zero conductivity. In the analysis of radio propagation, the increment of power density degradation at distance is compared between simulation and theoretical results. From the good agreement of simulation and theoretical results, effectiveness of antenna gain in the water condition is ensured. To evaluate the link design equation, simulation results for both the transmitting and receiving conditions of the antenna were obtained. It is clarified that the Friis transmission formula is useful for the link design equation. Finally, propagation measurement results at a swimming pool of 1.2-meter depth are compared with the simulation results. It is noted that water surface reflections disturb propagation attenuation.
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来源期刊
CiteScore
6.50
自引率
12.50%
发文量
90
审稿时长
8 weeks
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