2019 Fiscal Year Final Research Report
Millimeter-wave Propagation Control with High-Frequency Selectivity and High-Angle Selectivity using Meta Surface Showing Anomalous Absorption
| Project/Area Number |
17K06385
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Electron device/Electronic equipment
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Keywords | メタマテリアル |
|---|
| Outline of Final Research Achievements |
In the present work, we have developed a meta-surface with strong selectivity and almost zero scattering cross-section, which can be attached to the surface of a scatterer at a desired frequency and angle. A metasurface is a material that artificially expresses properties completely different from those of the natural material surface to electromagnetic waves by creating a periodic structure in the metal or dielectric that constitutes the material surface. Recently, anomalous absorption phenomena have been discovered on a mushroom-shaped meta-surface that strongly and in principle completely absorbs millimeter waves incident at a specific frequency and angle. By taking advantage of these abnormal absorption characteristics, we have realized a complete radio wave absorber that, in principle, completely suppresses reflections at a certain angle, even though it is extremely thin.
|
| Free Research Field |
マイクロ波工学・アンテナ工学
|
| Academic Significance and Societal Importance of the Research Achievements |
従来の電波吸収体は、素材の抵抗損失による電磁波の吸収作用を利用して反射を抑圧するが、ミリ波帯では素材の表面での反射が比較的大きくなり、反射量が大きくなってしまう。一方で開発したメタ表面は、異常吸収特性を利用したものであり、極めて薄いにも関わらず、原理的に、ある角度での反射を完全に抑圧することが可能である。
本研究で実現した超薄型完全電波吸収体は、任意の形状の散乱特性を自在にデザインするための基礎技術となるものであり、学術的に有意義である。また、これにより実現される分布型メタ表面は、将来のミリ波応用システムの実現と高性能化に寄与するものであり、実用面での貢献度も高い。
|
