Noncontact measurement of complex permittivity based on the principle of mid-range wireless power transfer

Fazhong Shen, Yannick Salamin, Jing Dong, Yongzhi Sun, Jiangtao Huangfu, Changzhi Li, Lixin Ran

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The measurement of complex permittivity of materials is of significant importance in scientific research and industrial applications. In this paper, we introduce the strongly coupled magnetic resonance previously used in high-efficiency midrange wireless power transfer to the noncontact measurement of the complex permittivity of materials. Theoretical analysis, full-wave simulation, and experimental measurements will show that the introduced high-Q-factor resonance can be used to effectively improve both the measurement sensitivity and the impedance matching to the instrument, avoiding the major weaknesses of the traditional magnetic induction method. The measurement setup can be easily calibrated for both solid and liquid materials and can provide the flexibility in noncontact measurement at a variable distance. We expect a wide range of applications to emerge from this novel approach.

Original languageEnglish
Article number6730721
Pages (from-to)669-678
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume62
Issue number3
DOIs
StatePublished - Mar 2014

Keywords

  • Complex permittivity
  • coupled magnetic resonance
  • noncontact measurement
  • wireless power transfer (WPT)

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