Comparative Analysis of Several Near-Field Probes for Magnetic Field Measurements

The near-field magnetic probe ( {H} -probe) is an essential diagnostic tool for analyzing electromagnetic interference in electronic products. Many types of {H} -probes have been designed and manufactured in recent years. Nevertheless, the performance of these probes in practical magnetic field ( {...

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Bibliographic Details
Published in:IEEE sensors journal 2023-12, Vol.23 (23), p.28723-28732
Main Authors: Li, Hui, Shao, Weiheng, Tian, Xinxin, Wu, Duo-Long, Ruan, Litao, Xue, Shan
Format: Article
Language:English
Subjects:
Couplings
Electric field suppression
Electric fields
Electromagnetic interference
Equivalent circuits
Frequency response
magnetic field measurement
magnetic field probe
Magnetic fields
Magnetic noise
Magnetic probes
Magnetic shielding
Mathematical models
Microstrip
Near fields
near-field measurement
Parameters
Performance evaluation
Probes
Spatial resolution
Stripline
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Summary:The near-field magnetic probe ( {H} -probe) is an essential diagnostic tool for analyzing electromagnetic interference in electronic products. Many types of {H} -probes have been designed and manufactured in recent years. Nevertheless, the performance of these probes in practical magnetic field ( {H} -field) measurement is not clear. In this article, six typical {H} -probes with the same loop area, labeled as UHP11, SHP11, UHP12, SHP12, UHP22, and SHP22, are designed and fabricated. The key parameters that can evaluate the performance of {H} -probes include frequency response (FR), intrusion of the probe to the device under test (DUT), spatial resolution (SR), common-mode electric field ( {E} -field) suppression, and differential {E} -field suppression. To analyze the key parameters of these probes, full-wave models of these {H} -probes are simulated and compared with measurements. Meanwhile, the equivalent circuit models of these {H} -probes are established to analyze {E} -field suppression in {H} -field measurement. The measurement results indicate that the shielded one-loop {H} -probe with differential output ports (SHP12) achieves the best differential {E} -field suppression, which is 26 dB at 5 GHz. In addition to the outstanding suppression performance on differential {E} -field, its common-mode {E} -field suppression is also the best and greater than 30 dB within 14.3 GHz. The SR of six
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2023.3325924