Research on Low Frequency Communication Technology Based on Rotating Permanent Magnet

ZHANG Feng; SUN Faxiao; QU Xiaodong; GONG Zhaoqian; JI Yicai; FANG Guangyou

doi:10.11999/JEIT210274

Volume 44 Issue 6

Jun. 2022

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Article Navigation > Journal of Electronics & Information Technology > 2022 > 44(6): 2151-2157

ZHANG Feng, SUN Faxiao, QU Xiaodong, GONG Zhaoqian, JI Yicai, FANG Guangyou. Research on Low Frequency Communication Technology Based on Rotating Permanent Magnet[J]. Journal of Electronics & Information Technology, 2022, 44(6): 2151-2157. doi: 10.11999/JEIT210274

Citation:

ZHANG Feng, SUN Faxiao, QU Xiaodong, GONG Zhaoqian, JI Yicai, FANG Guangyou. Research on Low Frequency Communication Technology Based on Rotating Permanent Magnet[J]. Journal of Electronics & Information Technology, 2022, 44(6): 2151-2157. doi: 10.11999/JEIT210274

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Research on Low Frequency Communication Technology Based on Rotating Permanent Magnet

doi: 10.11999/JEIT210274

ZHANG Feng^{1, 2
,
,},
SUN Faxiao^{1, 2, 3},
QU Xiaodong^{1, 2},
GONG Zhaoqian^{1, 2},
JI Yicai^{1, 2},
FANG Guangyou^{1, 2}

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2.
Key Laboratory of Electromagnetic Radiation and Sensing Technology, Beijing 100190, China
3.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Natural Science Foundation of China (61901441, 61827803)

Received Date: 2021-04-06
Rev Recd Date: 2021-08-26

Available Online: 2021-09-14

Publish Date: 2022-06-21

Abstract

Abstract

As a new type of low-frequency magnetic antenna, the rotating magnet antenna overcomes the shortcomings including large size, high power consumption, and low radiation efficiency of traditional low-frequency antenna and is mainly used in near-field low-frequency magnetic communication. FEKO is used to analyze the change of the magnetic field in the near area of the antenna with the direction, and explore the influence of the infinite ground on the magnetic field distribution in the near area of the antenna. The result shows that the antenna has the largest radiation intensity in its radial direction and the smallest radiation intensity in its axial direction. And the earth’s surface has less influence on the magnetic field signal in the short communication distance range. The relationship between magnetic and moment of inertia is analyzed, and the dimension parameters are optimized. An optimized prototype antenna and an original antenna are manufactured, and the power consumption of the two antennas during operating are measured. The experimental results demonstrate that the optimized antenna, which weighs 30 g more than the original antenna, reduces power consumption of about 5.5 W. The direct antenna modulation method is used to 2FSK modulation of the near-zone magnetic field, and the original symbol information is recovered using non-coherent demodulation. The measured results show that the optimized antenna can achieve ultra-low frequency communication with a symbol rate of 3.5 bps within a 20 m range in harsh electromagnetic environment.
- Rotating magnet antenna,
- Optimal design,
- Direct antenna modulation,
- Non-coherent demodulation

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References(17)

References

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