Integrated terahertz radar based on leaky-wave coherence tomography

Hironori Matsumoto, Issei Watanabe, Akifumi Kasamatsu, Yasuaki Monnai

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)122-129
Number of pages8
JournalNature Electronics
Issue number2
Publication statusPublished - 2020 Feb 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Electrical and Electronic Engineering


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