Journal
NATURE ELECTRONICS
Volume 3, Issue 2, Pages 122-129Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41928-019-0357-4
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Funding
- Strategic Information and Communications R&D Promotion Programme (SCOPE) from the Ministry of Internal Affairs and Communications [165103002]
- Japan Science and Technology Agency, PRESTO, Japan [JPMJPR18J9]
- Nanotechnology Platform Japan of the Ministry of Education, Culture, Sports, Science and Technology (MEXT)
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A pair of leaky-wave antennas can be used to make a compact, integrated terahertz radar detection system without phase shifters or circulators. Terahertz wave radar offers a higher resolution and smaller aperture compared with microwave radar. However, despite the emergence of terahertz sources and detectors suitable for radar front ends, the integration of a phased-array radar system remains challenging due to the lack of phase shifters and circulators, the basic components for beam steering and input-output isolation. Here we show that leaky-wave coherence tomography, which can integrate a terahertz radar system using a pair of reverse-connected leaky-wave antennas, can be used to implement beam steering and homodyne detection in one package. Our approach can detect direction and range without using phase shifters, circulators, half-mirrors, lenses or mechanical scanners, providing a compact, penetrating and high-resolution radar system suitable for mobile devices and drones. To illustrate the capabilities of the technique, we use it to create a remote heartbeat detector that can measure the chest displacement of a person through their clothes.
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