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.
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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 StyleDobroiu, 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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