Evaluation of field anisotropy coefficient in reverberation chamber and research on its optimal measurement method

Zhang Jiancheng; Lin Jiangchuan; Gao Yuan

doi:10.11884/HPLPB202537.250163

Volume 37 Issue 11

Sep. 2025

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Zhang Jiancheng, Lin Jiangchuan, Gao Yuan. Evaluation of field anisotropy coefficient in reverberation chamber and research on its optimal measurement method[J]. High Power Laser and Particle Beams, 2025, 37: 113011. doi: 10.11884/HPLPB202537.250163

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Zhang Jiancheng, Lin Jiangchuan, Gao Yuan. Evaluation of field anisotropy coefficient in reverberation chamber and research on its optimal measurement method[J]. High Power Laser and Particle Beams, 2025, 37: 113011. doi: 10.11884/HPLPB202537.250163

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Evaluation of field anisotropy coefficient in reverberation chamber and research on its optimal measurement method

doi: 10.11884/HPLPB202537.250163

Zhang Jiancheng^{1, 2
,},
Lin Jiangchuan^{1, 2
,
,},
Gao Yuan^{1, 2}

1.
Institute of Applied Electronics, CAEP, Mianyang 621900, China
2.
National Key Laboratory of Science and Technology on Advanced Laser and High Power Microwave, Mianyang 621900, China

Received Date: 2025-06-08
Accepted Date: 2025-09-14
Rev Recd Date: 2025-09-14

Available Online: 2025-09-25

Publish Date: 2025-11-15

Abstract

Abstract

Background
The reverberation chamber (RC) is widely used for electromagnetic compatibility testing. The field anisotropy coefficient is a key parameter for quantitatively evaluating its performance and enabling comparisons between different chambers, playing a critical role in assessing RC quality.
Purpose
This study aims to evaluate the field anisotropy coefficient of a reverberation chamber according to standard methods, verify its performance level, and propose an optimized testing approach to reduce the complexity and time required for measurement while maintaining accuracy.
Methods
First, the theoretical distribution of the field anisotropy coefficient was reviewed, indicating ideal values of 0 for 2D and 0.5547 for 3D. Measurements were then carried out using a three-axis electric field probe following standard procedures. To streamline the process, an optimized method based on scattering parameters was introduced, significantly reducing the number of required measurements.
Results
The standard measurement results showed that the 2D field anisotropy coefficient fell within [−0.1, 0.1], and the 3D coefficient was between [0.5254, 0.5589]. Overall, the values were below −15 dB, indicating “good” performance of the chamber according to the standard. The proposed optimized method produced consistent results, with field anisotropy coefficients largely remaining below −15 dB except for a few frequency points.
Conclusions
The reverberation chamber under test demonstrates good performance. The proposed scattering parameter-based method greatly reduces test time and complexity while yielding results consistent with those of the standard approach. This offers valuable practical guidance for efficient and accurate reverberation chamber evaluation.
- reverberation chamber,
- field anisotropy coefficient,
- evaluation,
- scattering parameters,
- optimal method

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References(15)

References

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