Study on 2D fast terahertz beam steering based on dielectric-free waveguiding structures

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02154
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: The University of Tokyo (2021-2022); Keio University (2020)
• Principal Investigator: Monnai Yasuaki 東京大学, 先端科学技術研究センター, 准教授 (90726770)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: テラヘルツ波 / ビームステアリング / アンテナ / 導波路

Outline of Final Research Achievements

In this study, we have proposed and demonstrated a terahertz beam steering method based on the control of the equivalent refractive index distribution for a waveguide mode propagating between hollow conductor plates with multiple reflection. Based on the proposed method, we have shown that leaky-wave beams in the 300 GHz band can be steered in two axes by combining refractive index gradient and frequency sweep. We have also designed, fabricated, and demonstrated a refractive index distribution that compensates for frequency dispersion in the structure based on topology optimization enabling broadband operation.

Free Research Field

テラヘルツ波工学

Academic Significance and Societal Importance of the Research Achievements

提案したビーム走査方法では、導体壁面に垂直な電場が存在しないため壁面電流による伝送損失が抑えられ、また中空であるため誘電損失も生じず、低損失な実装が可能となる。ビーム指向性の制御から検波までの処理を導波構造ベースで行えるようにしたことで、将来の100Gbps級の無線通信やサブミリ分解能のレーダー計測の技術基盤を確立した。