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Volume 21
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Article

Discrete Fourier Transform Radar in the Terahertz-Wave Range Based on a Resonant-Tunneling-Diode Oscillator †

by
Hiroki Konno
1,
Adrian Dobroiu
1,*,
Safumi Suzuki
1,
Masahiro Asada
1 and
Hiroshi Ito
2
1
Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
2
Center for Natural Sciences, Kitasato University, Kanagawa 252-0373, Japan
*
Author to whom correspondence should be addressed.
†
This paper is an extended version of our conference paper. H. Konno, A. Dobroiu, S. Suzuki, M. Asada, and H. Ito, “OCT technique for distance measurement using an RTD terahertz oscillator. In Proceedings of the 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Buffalo, NY, USA, 8–13 November 2020.
Sensors 2021, 21(13), 4367; https://doi.org/10.3390/s21134367
Submission received: 10 May 2021 / Revised: 21 June 2021 / Accepted: 23 June 2021 / Published: 25 June 2021
(This article belongs to the Special Issue Terahertz and Millimeter Wave Sensing and Applications)
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Abstract

We used a resonant-tunneling-diode (RTD) oscillator as the source of a terahertz-wave radar based on the principle of the swept-source optical coherence tomography (SS-OCT). Unlike similar reports in the terahertz range, we apply the stepwise frequency modulation to a subcarrier obtained by amplitude modulation instead of tuning the terahertz carrier frequency. Additionally, we replace the usual optical interference with electrical mixing and, by using a quadrature mixer, we can discriminate between negative and positive optical path differences, which doubles the measurement range without increasing the measurement time. To measure the distance to multiple targets simultaneously, the terahertz wave is modulated in amplitude at a series of frequencies; the signal returning from the target is detected and homodyne mixed with the original modulation signal. A series of voltages is obtained; by Fourier transformation the distance to each target is retrieved. Experimental results on one and two targets are shown.
Keywords: terahertz-wave radar; resonant-tunneling diode; optical coherence tomography; stepped-frequency continuous-wave radar terahertz-wave radar; resonant-tunneling diode; optical coherence tomography; stepped-frequency continuous-wave radar

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MDPI and ACS Style

Konno, H.; Dobroiu, A.; Suzuki, S.; Asada, M.; Ito, H. Discrete Fourier Transform Radar in the Terahertz-Wave Range Based on a Resonant-Tunneling-Diode Oscillator. Sensors 2021, 21, 4367. https://doi.org/10.3390/s21134367

AMA Style

Konno H, Dobroiu A, Suzuki S, Asada M, Ito H. Discrete Fourier Transform Radar in the Terahertz-Wave Range Based on a Resonant-Tunneling-Diode Oscillator. Sensors. 2021; 21(13):4367. https://doi.org/10.3390/s21134367

Chicago/Turabian Style

Konno, Hiroki, Adrian Dobroiu, Safumi Suzuki, Masahiro Asada, and Hiroshi Ito. 2021. "Discrete Fourier Transform Radar in the Terahertz-Wave Range Based on a Resonant-Tunneling-Diode Oscillator" Sensors 21, no. 13: 4367. https://doi.org/10.3390/s21134367

APA Style

Konno, H., Dobroiu, A., Suzuki, S., Asada, M., & Ito, H. (2021). Discrete Fourier Transform Radar in the Terahertz-Wave Range Based on a Resonant-Tunneling-Diode Oscillator. Sensors, 21(13), 4367. https://doi.org/10.3390/s21134367

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