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We report on a recent progress on resonant-tunneling-diode (RTD) terahertz oscillators and its radar applications including three-dimensional imaging.A fundamental oscillation up to 1.98 THz was obtained by a slot antenna with small conduction loss and a high-power operation of 0.7 mW at 1 THz was achieved by a large-scale oscillator array.For higher frequency and higher output power, structures with cavity resonators were proposed.For good uniformity and reduction in fabrication process, structure-simplified devices were developed.Using the high frequency modulation characteristics of RTD oscillators, we proposed and developed ranging systems using the RTD oscillators with the amplitude-modulated continuous-wave (AMCW)the frequency-modulated continuous-wave (FMCW)and the discrete Fourier transform (DFT) radar principles.These radar system shows fine ranging errors of below 1 mm by optimization in modulation setup and signal processing.
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Suzuki et al. (2022) studied this question.
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