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A 77-GHz six-port sensor for accurate near-field displacement and Doppler measurements

Homa Arab, Steven Dufour, Emilia Moldovan, Cevdet Akyel and Serioja O Tatu

Article (2018)

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Cite this document: Arab, H., Dufour, S., Moldovan, E., Akyel, C. & Tatu, S. O. (2018). A 77-GHz six-port sensor for accurate near-field displacement and Doppler measurements. Sensors, 18(8), p. 1-19. doi:10.3390/s18082565
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Abstract

A continuous-wave (CW) radar sensor design based on a millimetre-wave six-port interferometer is proposed. A complete sensor prototype is conceived of, fabricated and measured at 77 GHz for short-range professional and industrial applications. This sensor is designed to measure distances and Doppler frequencies with high accuracy, at a reasonable cost. Accurate phase measurements are also performed using the six-port technology, which makes it a promising candidate for CW radar sensing applications. Advances in the performance and functionality of six-port sensors are surveyed to highlight recent progress in this area. These include improvements in design, low power consumption, high signal to noise ratio, compactness, robustness and simplicity in realization. Given the fact that they are easy to fabricate, due to the lack of active circuits and being highly accurate, it is expected that six-port sensors will significantly contribute to the development of human tracking devices and industrial sensors in the near future. The entire circuit prototype, including the transmitter, the receiver antenna, the six-port interferometer and the four power detectors have been integrated on a die. The circuit is fabricated using a hybrid integrated technology on a 127-mum ceramic substrate with a relative permittivity of epsilonr=9.8. Calibrated tuning forks are used to assess the performance of the six-port sensor experimentally for various frequencies.

Uncontrolled Keywords

Doppler radar; antenna array; coupler; millimetre wave; passive component; reflection coefficient; sensor; six-port interferometer

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
2500 Génie électrique et électronique > 2520 Dispositifs, circuits et technologie hyperfréquences et d'ondes millimétriques
Department: Département de génie électrique
Département de mathématiques et de génie industriel
Research Center: Non applicable
Funders: CRSNG/NSERC
Grant number: RGPIN-2016-04525
Date Deposited: 09 Mar 2020 10:16
Last Modified: 10 Mar 2020 01:20
PolyPublie URL: https://publications.polymtl.ca/3557/
Document issued by the official publisher
Journal Title: Sensors (vol. 18, no. 8)
Publisher: MDPI
Official URL: https://doi.org/10.3390/s18082565

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