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Influence of strength and asymmetry of the coupling between a cavity and a transmission line on measurement of complex permittivity

✍ Scribed by Masaaki Ikeda; Kazuaki Nishida; Yasuyuki Nagata; Hitoshi Shimasaki; Masahiro Akiyama

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
407 KB
Volume
52
Category
Article
ISSN
0895-2477

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✦ Synopsis

Influence of the strength and the asymmetry of inputoutput ports on the measurement of complex permittivity by the resonant cavity perturbation method was investigated experimentally. We adopted the |S 21 | as the criterion of the strength, and the difference between S 11 and S 22 as the criterion of the asymmetry. When the coupling is symmetric, the real part of permittivity can be evaluated in strong coupling state up to À3 dB of coupling. The imaginary part of permittivity can be evaluated up to À14 dB of coupling. Imaginary part of the relative permittivity e 00 r was calculated using the conventional equation, which is based on the complete symmetry of the coupling of input-output ports. For the measurement of high-Q materials, calculated e 00 r is strongly affected by the asymmetry in the strongly coupled region.

For the measurement of lossy materials, the inevitable asymmetry and the strong coupling allow enough exact evaluation of e 00 r . V

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