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An air gap correction method for permittivity extraction of high-loss materials

Author

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  • Weijie Wang
  • Wei Jiang
  • Yelei Yao
  • Jianxun Wang
  • Guo Liu

Abstract

This paper developed a method for more accurate permittivity extraction of high-loss materials using the waveguide method to reduce the effect of the air gap. This method improves the Baker-Jarvis algorithm. It makes the errors of S-parameters caused by the air gap compensated by a correction factor β of the form: (S21 + S12) + β(S11 + S22). In our study, the correction results of β for materials on different frequencies and air gap sizes are quantitatively investigated. Furthermore, we propose a method to obtain an optimal frequency-independent β for different materials. A typical high-loss BeO-SiC ceramic commonly used in vacuum electron tubes is analyzed and discussed in detail. It shows that compared to traditionally utilizing only S21 (β = 0), adopting an optimal β can reduce the average errors of the complex permittivity from 17.7% to 7.9% with a 0.10 mm air gap. The proposed method is verified by measurements of unshaved and shaved samples.

Suggested Citation

  • Weijie Wang & Wei Jiang & Yelei Yao & Jianxun Wang & Guo Liu, 2024. "An air gap correction method for permittivity extraction of high-loss materials," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 38(13), pages 1435-1449, September.
    • Handle: RePEc:taf:tewaxx:v:38:y:2024:i:13:p:1435-1449
    DOI: 10.1080/09205071.2024.2379466
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