Analysis of the Electrical Performance of Multituned VLF Thirteen-Tower Umbrella Antennas

Xu, Xiangyu; Xie, Hui; Luo, Zhiqing; Wan, Lu

doi:10.1155/2022/8590468

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…However, the calculation of the low-frequency near-field has always been a difficult problem to solve. For example, the method of moment (MOM) [18][19][20] has a singularity in the calculation of the near-field, and it is difficult to deal with it. The finite element method (FEM) [21][22][23] and finite difference time domain Generally speaking, the long-term focus of EM research has been on the far-field characteristics of traditional problems such as EM propagation, radiation, and scattering, while the attention and research on the near-field characteristics are still relatively weak [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…However, the calculation of the low-frequency near-field has always been a difficult problem to solve. For example, the method of moment (MOM) [18][19][20] has a singularity in the calculation of the near-field, and it is difficult to deal with it. The finite element method (FEM) [21][22][23] and finite difference time domain (FDTD) [24][25][26] have errors caused by boundary truncation; the former may have pseudo-solutions, and the latter is troubled by the difficulty of accurately fitting the surface boundary.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Field Variation of ELF Near-Region Excited by HED in a Homogeneous Half-Space Model

Xie

Ding

2023

Applied Sciences

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Great attention has been paid to the propagation of electromagnetic (EM) waves across the sea surface due to its important applications. Most of the previous research, however, focuses on the half-space model illustrating the deep sea environment. In this paper, EM field distribution in the extremely low frequency (ELF) near-region under horizontal electric dipole (HED) excitation in homogeneous half-space seawater is analyzed based on the general expression of the Sommerfeld integral using the quasistatic approximation method. The focus is on deriving complete and effective solutions in air and seawater regions under the cylindrical coordinates for the EM near-field, which is generated by an HED in a shallow sea. The resulting formulas can be given by a few summands in closed form as the well-known Fourier–Bessel integrals. The analytical approximate expression of ELF Sommerfeld EM field integral excited by the HED in the homogeneous half-space seawater is deduced under the condition that the propagation distance ρ satisfies kρ << 1. To this end, the EM field distribution in the range close to the HED antenna in seawater is simulated, the results have shown that the minimum attenuation value of the vertical electric component Ez is about 15 dB, and that of the radical magnetic components Hφ is about 30 dB, and these values are found to be of greatest potential for the near-field region propagation among the electric and magnetic components. Finally, the correctness of the proposed method is verified by comparison with Pan’s approximation method and Margetis’s exact expression approximation method, which demonstrated the correctness of the proposed method.

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Section: Introductionmentioning

confidence: 99%

“…However, the calculation of the low-frequency near-field has always been a difficult problem to solve. For example, the method of moment (MOM) [18][19][20] has a singularity in the calculation of the near-field, and it is difficult to deal with it. The finite element method (FEM) [21][22][23] and finite difference time domain (FDTD) [24][25][26] have errors caused by boundary truncation; the former may have pseudo-solutions, and the latter is troubled by the difficulty of accurately fitting the surface boundary.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Variation of ELF Near-Region Excited by HED in a Homogeneous Half-Space Model

Xie

Ding

2023

Applied Sciences

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Multiobjective Particle Swarm Optimization to Design the Top Load of a Very Low Frequency Thirteen-Tower Umbrella Antenna

Xie

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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In this paper, an innovative method for designing the top load of a very low frequency (VLF) thirteen-tower umbrella antenna based on multiobjective particle swarm optimization (MOPSO) is proposed. The design of the thirteen-tower umbrella antenna’s top load mainly involves the sag and position distribution of the cables. On the basis of analyzing the influence of the cables’ sag on the antenna’s radiation efficiency, a MOPSO based on the Pareto optimality is used to optimize the location distribution of the antenna top load catenaries. The radiation resistance and static capacitance of the antenna can be both slightly improved when each diamond-shaped top load maintains 8 top load cables, while the radiation resistance and static capacitance of the antenna can be improved by more than 6% when each diamond-shaped top load is increased to 10 top load cables.

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On the Radiation Resistance of Folded Antennas

Walden

2024

2024 18th European Conference on Antennas and Propagation (EuCAP)

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Analysis of the Electrical Performance of Multituned VLF Thirteen-Tower Umbrella Antennas

Cited by 3 publications

References 20 publications

Electromagnetic Field Variation of ELF Near-Region Excited by HED in a Homogeneous Half-Space Model

Electromagnetic Field Variation of ELF Near-Region Excited by HED in a Homogeneous Half-Space Model

Multiobjective Particle Swarm Optimization to Design the Top Load of a Very Low Frequency Thirteen-Tower Umbrella Antenna

On the Radiation Resistance of Folded Antennas

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