An optimum design methodology for planar-type coaxial probes applicable to broad temperature permittivity measurements

Namgon Kim, Jeonghoon Yoon, Sungjoon Cho, Jeiwon Cho, Changyul Cheon, Youngwoo Kwon

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A planar-type coaxial probe applicable to wide temperature and frequency range has been developed. The probe employs a dielectric with a low coefficient of thermal expansion to minimize the effect of thermal deformation for broad temperature measurements. Additionally, a detailed design methodology has been developed to optimize the probe apertures in an effort to minimize the measurement uncertainty while maximizing the operating bandwidth. For this purpose, thorough sensitivity analysis has been employed to correlate the probe structures and dimensions to the individual sensitivity parameters. The analysis has been validated by parametric experiments. By using the dielectric with a low coefficient of thermal expansion and optimizing the probe dimensions, accurate permittivity measurements have been demonstrated from - 30°C to 75°C with 40-GHz bandwidth. With the application of the error-correction method, the measurement temperature range has been further extended all the way up to the boiling temperature of water (∼100°C). Furthermore, the complex permittivities of methanol have been measured from -30°C to 50°C and the dispersion parameters and full interpolation formulas have been extracted.

Original languageEnglish
Article number4449065
Pages (from-to)684-692
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number3
DOIs
StatePublished - Mar 2008

Bibliographical note

Funding Information:
Manuscript received May 3, 2007; revised October 10, 2007. This work was supported by the Korean Ministry of Science and Technology under the Creative Research Initiative Program.

Keywords

  • Coaxial aperture
  • Complex permittivity
  • Planar-type probe
  • Thermal deformation
  • Wide temperature

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