Fast and Accurate THz Permittivity Measurement Using a Self-Heterodyne Technique and Multitone Signal with Nonuniform Intervals

Teruo Jyo, Hiroshi Hamada, Daisuke Kitayama, Makoto Yaita, Amine El Moutaouakil, Hideaki Matsuzaki, Hideyuki Nosaka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A permittivity measurement system operating in the terahertz waveband around 300 GHz achieves fast measurement by using a self-heterodyne technique to measure phase differences. Errors are reduced because a multitone technique with nonuniform frequency intervals enables us to apply a phase-unwrapping method to the self-heterodyne system. For multitone signal generation, just single-frequency oscillators and local oscillator leakage from a modulator are used. The system achieves a measurement time of 0.03 ms at one point, which is 1/200 compared to a conventional system using a vector network analyzer. With the same measurement time, the maximum measurement error can be reduced to less than half compared to the conventional two-tone self-heterodyne system.

Original languageEnglish
Article number8400543
Pages (from-to)4649-4657
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume66
Issue number10
DOIs
Publication statusPublished - Oct 2018

Keywords

  • High-speed measurement
  • multitone unwrapping
  • nondestructive inspection
  • permittivity measurement
  • phase slope
  • self-heterodyne
  • terahertz (THz)
  • thickness measurement

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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