Coaxial resonant cavity for measuring complex permittivity of liquids

Yi Wang; Zhixia Xu; Yulin Feng; Shaojun Fang

doi:10.1515/freq-2022-0115

Article

Coaxial resonant cavity for measuring complex permittivity of liquids

Yi Wang , Zhixia Xu , Yulin Feng and Shaojun Fang

Published/Copyright: September 26, 2022

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From the journal Frequenz Volume 77 Issue 5-6

Abstract

In this letter, a new microwave sensor of the coaxial resonant cavity with a single-open-ended circuit loaded capacitor is proposed and used to detect the liquids’ complex permittivity. The improved cavity has a higher internal electric field and smaller size when compared with the cylindrical cavity, which gives the sensor a high sensitivity in measuring liquids’ complex permittivity. A coaxial resonant cavity operating in 1.9 GHz was designed in this work. The silicone hose used for the test is inserted vertically from the center of the cavity, and the liquids under test (LUTs) are guaranteed to be 2 ml each time. The dielectric properties of LUTs will cause perturbation to the internal electric field of the cavity. By analyzing the measured data, the sensitivity of the cavity is 0.12%, and the relative errors of the real part of the measured value and the reference value are 3.67%. which shows the measured value has a good agreement with the reference value.

Keywords: coaxial resonant cavity; complex permittivity; liquids under test (LUTs); microwave sensor

Corresponding author: Zhixia Xu, School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China, E-mail: zhixiaxu@dlmu.edu.cn

Funding source: The Fundamental Research Funds for the Central Universities http://dx.doi.org/10.13039/501100018594

Award Identifier / Grant number: 3132022240

Funding source: The State Key Laboratory of Millimeter Waves http://dx.doi.org/10.13039/501100011421

Award Identifier / Grant number: K202202

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Z. Xu acknowledge the supports of the Fundamental Research Funds for the Central Universities under Grant 3132022240 and the State Key Laboratory of Millimeter Waves under Grant K202202.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-05-31

Accepted: 2022-09-16

Published Online: 2022-09-26

Published in Print: 2023-06-27

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Articles in the same Issue

https://doi.org/10.1515/freq-2022-0115

Keywords for this article

coaxial resonant cavity; complex permittivity; liquids under test (LUTs); microwave sensor