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access icon free Dielectric characterisation of small samples using broadband coaxial cavity

  • Author(s): Chengyong Yu 1 ; En Li 1 ; Gaofeng Guo 1
    • View affiliations
  • Source: Volume 53, Issue 19, 14 September 2017, p. 1316 – 1318
    DOI:  10.1049/el.2017.2492 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
Received 28/06/2017, Published 21/08/2017
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A method aimed at dielectric parameters measurement of small samples using a coaxial re-entrant cavity is proposed. After introducing grooves in the cavity structure to suppress parasitic modes, the operating frequency range has been broadened to 0.6–13 GHz for only one cavity. Compared to the traditional structure, the working bandwidth has expanded to 344% of the original one. The cavity perturbation technique is applied to detect the complex permittivity. The proposed method features two advantages over existing techniques, high sensitivity and more convenience for placing the sample.

Inspec keywords: permittivity; dielectric materials; microwave materials; dielectric measurement

Other keywords: cavity structure; coaxial re-entrant cavity; broadband coaxial cavity; cavity perturbation technique; parasitic mode suppression; dielectric parameter measurement; frequency 0.6 GHz to 13 GHz; grooves; dielectric characterisation; complex permittivity detection

Subjects: Dielectric variables measurement; Dielectric materials and properties; Microwave materials and structures

References

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      • 7. Westphal, W.B., Iglesias, J.: ‘Dielectric measurements on high-temperature materials’. Technical Report, AFML TR-70-138, Laboratory for Insulation Research, MIT, 1970, AD873038, p. 40.
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      • 2. Jarvis, J.B., Riddle, B.F.: ‘Dielectric measurements using a re-entrant cavity: mode-matching analysis’, NIST Technical Note, 1384, 1996,.
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