Two-Dimensional Terahertz Beam Steering Based on Trajectory Deflection of Leaky-Mode

Kazuto Sato, Yasuaki Monnai

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Free-space transmission of terahertz waves open great opportunities for wireless communication and sensing in the Beyond 5G/6G paradigm. Nevertheless, terahertz transmission suffers from severe diffraction losses due to the shorter wavelengths than the microwaves. To compensate for the diffraction losses, point-to-point transmission by directional beams is indispensable. However, implementing terahertz beam steering is still challenging due mainly to the lack of practical phase shifters. To circumvent this challenge, we demonstrate a novel strategy of two-dimensional (2-D) terahertz beam steering based on trajectory deflection of leaky-mode at around 300 GHz. We use a pair of metal plates with a mesh surface, in which the phase velocity exceeds the light speed in free-space. The leaky-mode can be steered vertically by a phase matching condition controllable with frequency sweep and horizontally by graded refractive index controllable with small tilt of the plate. The result confirms 2-D beam steering without relying on phase shifters.

Original languageEnglish
Pages (from-to)676-683
Number of pages8
JournalIEEE Transactions on Terahertz Science and Technology
Issue number6
Publication statusPublished - 2021 Nov 1


  • Beam steering
  • Luneburg lens
  • leaky-wave antennas

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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