| Project/Area Number |
17K06431
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Communication/Network engineering
|
|---|
| Research Institution | Kumamoto University |
|---|
Principal Investigator |
Fukusako Takeshi 熊本大学, 大学院先端科学研究部(工), 教授 (90295121)
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Project Status |
Completed (Fiscal Year 2019)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| Keywords | アンテナ / メタ表面 / 円偏波 / 広帯域特性 / 広帯域 / 端部形状 / 位相分布 / アンテナ技術 / 円偏波アンテナ / メタマテリアル |
|---|
| Outline of Final Research Achievements |
In this research, we develop a meta-surface design technology for obtaining a circularly polarized antenna characteristics. In order to widen the band for generating circular polarization (CP), we considered a meta-surface wide band as a polariser to enhance the CP frequency range. The unit cell has a square shape, but each side of the meta surface has a rhombus structure that is inclined by 45° with respect to the unit cell, and irradiates linearly polarized light with an angle of 45° with respect to the x-axis. As a result, it was found that linearly polarized waves could be converted into circularly polarized waves over a wide band. It was also found to be effective to make the circumference circular. Finally, we also examined a cross-polarization polarization converter that applies the principle of a circularly polarized antenna.
|
| Academic Significance and Societal Importance of the Research Achievements |
メタ表面が広帯域な諸特性を得るために，重要な知見を得ることができた．特に，メタ表面の設計段階においては，単位セルと周期境界条件で囲み，等価的に無限のアレーとした場合を仮定するのが通常だが，実際には有限のアレーとなる．この場合，端部の影響が深刻であるが，その影響を緩和する方法として，長方形の単位セルに有限周囲の辺が４５度となるひし形構造が有効であることが分かった．他，円形の周囲も有効であることも同時に確認できた．また，広帯域円偏波技術を応用したメタ表面偏波変換器も開発でき，今回の知見が応用できる．
|
