A Small Active Magnetic Antenna of Loran-C

Wang, Kaixuan; Tang, Sheng; Ke, Jing; Hou, Yi

doi:10.1109/jsen.2022.3222577

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…The above FDTD method is used to predict the Loran-C [24] resultant waves with multipropagation modes in the Earthionosphere waveguide in the presence of the natural magnetic field. The carrier frequency of Loran-C is 100 kHz and its excitation current is defined as [23] i…”

Section: Decomposition Of Electromagnetic Waves With Different Modesmentioning

confidence: 99%

Analysis of Long-distance Propagation Characteristics of LF Multi-hop Sky Waves

Zhou,

Zhu,

et al. 2023

PIER Letters

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This paper focuses on the decomposition of different modes of Loran-C resultant waves, including ground waves and onehop/two-hop sky waves, propagating in the Earth-ionosphere waveguide obtained from direct finite-difference time-domain (FDTD) modeling in the presence of the natural magnetic field. After providing the FDTD iterative formulas for the ionosphere affected by the natural magnetic field, the Loran-C resultant waves propagating in the anisotropic Earth-ionosphere waveguide are estimated using the FDTD algorithm. In both the daytime and nighttime ionosphere models, different orientations of the natural magnetic field are taken into account. The arrival times of the different propagation modes for the resultant waves were then determined using a multipath time-delay estimation method. With the above delays, the amplitudes of the different modes are acquired by solving overdetermined equations. Finally, the decomposition results are compared with those obtained in the absence of the natural magnetic field. The numerical experimental results indicate that, with a radiation power of 1 kW and a natural magnetic field of 0.5 Gs, the influence of the direction of the natural magnetic field on the field strength of one-hop sky waves is significant when the propagation distance of LF radio waves is less than 1000 km. Radio waves have multipath effects such as convergence, divergence, and diffraction due to the curvature of the Earth and the ionosphere. This results in significant interference phenomena when the propagation distance of two-hop sky waves is greater than 500 km.

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Section: Decomposition Of Electromagnetic Waves With Different Modesmentioning

confidence: 99%

Analysis of Long-distance Propagation Characteristics of LF Multi-hop Sky Waves

Zhou,

Zhu,

et al. 2023

PIER Letters

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Dual magnetoelectric antenna array with enhanced bandwidth and sensitivity for low-frequency communications

Wang,

Song,

et al. 2024

Journal of Applied Physics

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The magnetoelectric coupling effect demonstrated immense potential for miniaturizing antenna applications. However, due to the resonant nature of magnetoelectric (ME) antennas, their bandwidth tended to be relatively narrow. To address this limitation, our study introduced an array design based on coupled ME antennas. A tri-layer FeGa–PZT8–FeGa laminate structure was employed to construct the ME antennas, which utilized inter-array coupling to broaden the frequency range. Both the central frequency and sensitivity of the array structure were theoretically analyzed, and two methods for extending the frequency were proposed. By coupling two ME antennas of similar frequency in the series mode, the arrayed ME antennas exhibited enhanced sensitivity, increasing from 0.225 and 0.247 to 0.413 mV/nT, and an expanded bandwidth from 0.92–1.03 to 1.4 kHz, indicating improved performance through combined configuration. On the other hand, by coupling two ME antennas of different frequencies together in the series mode, a dual-frequency (97.8/98.97 kHz) ME antenna array was formed. The communication capabilities of the ME antenna array under weak magnetic fields were demonstrated using amplitude shift keying and frequency shift keying modulation methods. The designed array of ME antennas elevated low-frequency communication performance and possessed excellent magnetic field detection capabilities, thereby offering a cost-effective technological pathway for bioelectronic and marine communication design.

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Enhancing Coastal Air Navigation: eLoran 3-D Positioning and Cycle Slip Mitigation

Son,

Hyun Fang

2024

IEEE Access

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A Small Active Magnetic Antenna of Loran-C

Cited by 5 publications

References 25 publications

Analysis of Long-distance Propagation Characteristics of LF Multi-hop Sky Waves

Analysis of Long-distance Propagation Characteristics of LF Multi-hop Sky Waves

Dual magnetoelectric antenna array with enhanced bandwidth and sensitivity for low-frequency communications

Enhancing Coastal Air Navigation: eLoran 3-D Positioning and Cycle Slip Mitigation

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