Adrian Dobroiu, Ryotaka Wakasugi, Masafumi Suzuki, Masahiro Asada,
https://aip.scitation.org/doi/10.1063/1.5089437
We report the principle and first experimental results on a terahertz-wave radar based on a resonant-tunneling diode (RTD) working as a 522 GHz radiation source and a Schottky barrier diode (SBD) as a detector. By modulating the output power of the RTD at two frequencies and measuring the corresponding phase delays after the terahertz wave propagates from the source to the detector, we were able to measure the absolute propagation distance between them (including all the cables carrying the signals) with an error of about 10 mm. We then combined this absolute distance with the phase delay measured at one frequency to further reduce the error of the distance measurement to below 0.4 mm.
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