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Open AccessArticle

Subcarrier Frequency-Modulated Continuous-Wave Radar in the Terahertz Range Based on a Resonant-Tunneling-Diode Oscillator

1
Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
2
Center for Natural Sciences, Kitasato University, Sagamihara, Kanagawa 252-0373, Japan
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(23), 6848; https://doi.org/10.3390/s20236848
Received: 14 October 2020 / Revised: 25 November 2020 / Accepted: 27 November 2020 / Published: 30 November 2020
(This article belongs to the Special Issue Terahertz Imaging and Sensors)
We introduce a new principle for distance measurement in the terahertz-wave range using a resonant-tunneling-diode (RTD) oscillator as a source at 511 GHz and relying on the frequency-modulated continuous-wave (FMCW) radar technique. Unlike the usual FMCW radar, where the sawtooth frequency modulation is applied to the carrier, we propose applying it to a subcarrier obtained by amplitude modulation; this is advantageous when the source cannot be controlled precisely in oscillation frequency, but can easily be modulated in amplitude, as is the case of the RTD oscillator. The detailed principle and a series of proof-of-concept experimental results are presented. View Full-Text
Keywords: terahertz-wave radar; resonant-tunneling diode; frequency-modulated continuous-wave radar terahertz-wave radar; resonant-tunneling diode; frequency-modulated continuous-wave radar
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MDPI and ACS Style

Dobroiu, A.; Shirakawa, Y.; Suzuki, S.; Asada, M.; Ito, H. Subcarrier Frequency-Modulated Continuous-Wave Radar in the Terahertz Range Based on a Resonant-Tunneling-Diode Oscillator. Sensors 2020, 20, 6848.

AMA Style

Dobroiu A, Shirakawa Y, Suzuki S, Asada M, Ito H. Subcarrier Frequency-Modulated Continuous-Wave Radar in the Terahertz Range Based on a Resonant-Tunneling-Diode Oscillator. Sensors. 2020; 20(23):6848.

Chicago/Turabian Style

Dobroiu, Adrian; Shirakawa, Yusuke; Suzuki, Safumi; Asada, Masahiro; Ito, Hiroshi. 2020. "Subcarrier Frequency-Modulated Continuous-Wave Radar in the Terahertz Range Based on a Resonant-Tunneling-Diode Oscillator" Sensors 20, no. 23: 6848.

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