Generalised probe method to measure the liquid complex permittivity

Lei Xing, Jiajia Zhu, Qian Xu, Yongjiu Zhao, Chaoyun Song, Yi Huang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A generalised probe method is proposed for fast and accurate complex permittivity measurements. The method is based on the simulated reflection coefficients using the finite difference frequency domain method. A database is set up, which consists of the simulated complex reflection coefficients of the unknown material under test. A fast searching algorithm is performed to match the measured reflection coefficients to the reference values in the database, thus the complex permittivity of the liquid can be obtained. An in-house measurement system is developed. The unique feature of this system is that it can be applied to an arbitrarily-shaped probe. Liquid samples are measured and the results are compared with that published in the literature. Good agreements are obtained. These results could be useful for liquid microwave component designs and applications.
Original languageEnglish
Pages (from-to)707-711
Number of pages5
JournalIET Microwaves, Antennas and Propagation
Issue number8
Early online date27 Feb 2020
Publication statusPublished - 1 Jul 2020


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