TY - JOUR
T1 - Fast and Accurate THz Permittivity Measurement Using a Self-Heterodyne Technique and Multitone Signal with Nonuniform Intervals
AU - Jyo, Teruo
AU - Hamada, Hiroshi
AU - Kitayama, Daisuke
AU - Yaita, Makoto
AU - Moutaouakil, Amine El
AU - Matsuzaki, Hideaki
AU - Nosaka, Hideyuki
N1 - Funding Information:
Manuscript received June 30, 2017; revised November 14, 2017; accepted May 25, 2018. Date of publication June 29, 2018; date of current version October 4, 2018. This work was supported by the research and development project for the expansion of radio spectrum resources through the Ministry of Internal Affairs and Communications, Japan (multi-tens gigabit wireless communication technology at subterahertz frequencies). This paper is an expanded version from the 2017 International Microwave Conference, Honolulu, HI, USA, June 4–9, 2017. (Corresponding author: Teruo Jyo.) T. Jyo, H. Hamada, H. Matsuzaki, and H. Nosaka are with the NTT Device Technology Laboratories, NTT Corporation, Atsugi 243-0198, Japan (e-mail: xu.zhaonan@lab.ntt.co.jp).
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2018/10
Y1 - 2018/10
N2 - 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.
AB - 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.
KW - High-speed measurement
KW - multitone unwrapping
KW - nondestructive inspection
KW - permittivity measurement
KW - phase slope
KW - self-heterodyne
KW - terahertz (THz)
KW - thickness measurement
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U2 - 10.1109/TMTT.2018.2847687
DO - 10.1109/TMTT.2018.2847687
M3 - Article
AN - SCOPUS:85049323391
SN - 0018-9480
VL - 66
SP - 4649
EP - 4657
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 10
M1 - 8400543
ER -