Principle of a Subcarrier Frequency-modulated Continuous-wave Radar in the Terahertz Band Using a Resonant-tunneling-diode Oscillator

Shirakawa, Yusuke; Dobroiu, Adrian; Suzuki, Safumi; Asada, Masahiro; Itô, Hiroshi

doi:10.1109/irmmw-thz.2019.8873752

Cited by 4 publications

(6 citation statements)

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“…The reason is due to th culty of linearly sweeping the RTD carrier frequencies using current technology. Th liminary experimental results in [26,[63][64][65][66][67] demonstrate that RTD radars are cap precise distance measurement with very low ranging error (µ m range). With furth provements of the system, such as a high power RTD source, varactor diode inte RTD VCO, high responsivity and low NEP detector, and better signal and data proc algorithm, the RTD THz radar technique can rapidly evolve to the next level to long-distance high precision THz radar with compact size and low power consum Since RTDs have narrow linewidths, an RTD voltage-control oscillator (VCO has been proposed to cover frequencies from 420 GHz to 970 GHz [69].…”

Section: Compact Rtd Thz Imaging and Other Ndt Systemsmentioning

confidence: 95%

“…The modulation speed is up to tens of GHz [23,24], which will make the imaging system more practical for industrial applications by eliminating the chopping mechanism. Another important emerging application is RTD-based THz radar, includ tude-modulated continuous-wave (AMCW) where the THz wave amplitude is m Another important emerging application is RTD-based THz radar, including amplitudemodulated continuous-wave (AMCW) where the THz wave amplitude is modulated by sinusoidal signal superimposed on the DC bias of RTD [63][64][65][66], and subcarrier frequency modulated continuous wave (FMCW) radar, where again the amplitude of THz is modulated with linearly sweeping frequencies [26,67].…”

Section: Compact Rtd Thz Imaging and Other Ndt Systemsmentioning

confidence: 99%

“…quency modulated continuous wave (FMCW) radar, where again the amplitude o is modulated with linearly sweeping frequencies [26,67].…”

Section: Compact Rtd Thz Imaging and Other Ndt Systemsmentioning

confidence: 99%

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An Overview of Terahertz Imaging with Resonant Tunneling Diodes

2022

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Terahertz (THz) imaging is a rapidly growing application motivated by industrial demands including harmless (non-ionizing) security imaging, multilayer paint quality control within the automotive industry, insulating foam non-invasive testing in aerospace, and biomedical diagnostics. One of the key components in the imaging system is the source and detector. This paper gives a brief overview of room temperature THz transceiver technology for imaging applications based on the emerging resonant tunneling diode (RTD) devices. The reported results demonstrate that RTD technology is a very promising candidate to realize compact, low-cost THz imaging systems.

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Section: Compact Rtd Thz Imaging and Other Ndt Systemsmentioning

confidence: 95%

Section: Compact Rtd Thz Imaging and Other Ndt Systemsmentioning

confidence: 99%

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An Overview of Terahertz Imaging with Resonant Tunneling Diodes

2022

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“…Sensors 2020, 20, x FOR PEER REVIEW 3 of 13 achieve a specific lateral resolution (when using focused beams), are given by the terahertz-frequency carrier, not by the gigahertz-range subcarrier. This paper includes results previously reported at two conferences [15,16] as well as a large amount of information never published, such as the theoretical background, a series of improvements of the method, new measurements, and a thorough discussion of the results.…”

Section: Principlementioning

confidence: 99%

“…This paper includes results previously reported at two conferences [15,16] as well as a large amount of information never published, such as the theoretical background, a series of improvements of the method, new measurements, and a thorough discussion of the results.…”

Section: Introductionmentioning

confidence: 99%

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

Dobroiu

Shirakawa

Suzuki

et al. 2020

Sensors

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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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Amplitude-modulated continuous-wave radar in the terahertz range using lock-in phase measurement

Dobroiu

Wakasugi

Shirakawa

et al. 2020

Meas. Sci. Technol.

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We present the principle and the experimental verification of a distance measurement method based on the propagation of terahertz waves. The method relies on modulating the amplitude of a resonant-tunneling-diode (RTD) oscillator used as terahertz-wave source and on measuring the phase of the detected wave by applying a quadrature mixing technique. The distance measurement is found to have a residual error as small as 0.063 mm (standard deviation), which is a record for an RTD-based terahertz-wave radar system. This is almost five times better than our previous record of 0.29 mm, when an oscilloscope was used for phase measurements; additionally, the quadrature mixing brings about numerous practical benefits, such as greatly reduced cost, size, weight, complexity, and power consumption.

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Principle of a Subcarrier Frequency-modulated Continuous-wave Radar in the Terahertz Band Using a Resonant-tunneling-diode Oscillator

Cited by 4 publications

References 3 publications

An Overview of Terahertz Imaging with Resonant Tunneling Diodes

An Overview of Terahertz Imaging with Resonant Tunneling Diodes

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

Amplitude-modulated continuous-wave radar in the terahertz range using lock-in phase measurement

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