Journal
PHOTONICS
Volume 5, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/photonics5040052
Keywords
terahertz-wave radar; resonant-tunneling diode; amplitude-modulated continuous-wave radar
Categories
Funding
- JSPS [16H06292]
- JST-ACCEL [JPMJMI17F2]
- JST-CREST [JPMJCR1534]
- JST Industry-Academia Collaborative RD
- SCOPE program of the Ministry of Internal Affairs and Communications [175003003]
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We present the principle of a terahertz-wave radar and its proof-of-concept experimental verification. The radar is based on a 522 GHz resonant-tunneling-diode oscillator, whose terahertz output power can be easily modulated by superimposing the modulation signal on its bias voltage. By using one modulation frequency and measuring the time delay of the returning signal, a relative measurement of the propagation distance is possible; adding a second modulation frequency removes the ambiguity stemming from the periodicity of the modulation sine wave and allows an absolute distance measurement. We verified this measurement method experimentally and obtained a submillimeter precision, as predicted by theory.
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