Circuit Modeling of Near-Field Coupled Undersea Antennas Using Impedance Double Expansion Method

IF 4.6 1区 计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Nozomi Haga;Jerdvisanop Chakarothai;Keisuke Konno
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引用次数: 0

Abstract

This study addresses circuit modeling of near-field coupled antennas that are separately enclosed in lossless dielectrics and immersed in seawater, which are intended for applications such as undersea wireless power transfer (WPT) systems. To accomplish this, a circuit modeling technique called the impedance expansion method (IEM) is extended to consider lossy dielectrics with a loss tangent greater than unity. Unlike the conventional IEM, the extended method first expands the coefficient matrices derived by the method of moments (MoM) into the Laurent series with respect to propagation constants and then further expands them with respect to the complex angular frequency. Based on this feature, the extended method is called the impedance double expansion method (IDEM). By applying the IDEM to the undersea dipole and loop antennas with pure water covers, their circuit models are obtained. Comparison with the full-wave MoM and finite-difference time-domain (FDTD) calculations shows that these circuit models reasonably approximate not only the reflection and transmission coefficients between the antennas with matching circuits (MCs) but also the radiation loss.
阻抗双展开法近场耦合水下天线电路建模
本研究解决了近场耦合天线的电路建模问题,这些天线分别封装在无损介质中并浸入海水中,用于海底无线电力传输(WPT)系统等应用。为了实现这一点,一种称为阻抗展开法(IEM)的电路建模技术被扩展到考虑损耗正切大于1的损耗电介质。与传统的IEM方法不同,该方法首先将矩量法(MoM)导出的系数矩阵对传播常数展开为Laurent级数,然后对复角频率进一步展开。基于这一特点,这种扩展方法被称为阻抗双展开法(IDEM)。将IDEM应用于具有纯水罩的海底偶极子天线和环形天线,得到了它们的电路模型。与全波模态和时域有限差分(FDTD)计算的比较表明,这些电路模型不仅能较好地近似匹配电路天线间的反射系数和透射系数,而且能较好地逼近天线间的辐射损耗。
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来源期刊
CiteScore
10.40
自引率
28.10%
发文量
968
审稿时长
4.7 months
期刊介绍: IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas, including design and development, and in the propagation of electromagnetic waves, including scattering, diffraction, and interaction with continuous media; and applications pertaining to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques
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