Establishment of implicit and hybrid-implicit-explicit FDTD methods in cylindrical coordinates and development of a metal disc-type THz surface wave splitter
| Jazyk: | japonština |
|---|---|
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | 科学研究費助成事業 研究成果報告書. :1-6 |
| Popis: | 研究成果の概要 (和文) : 本研究では、円筒座標系FDTD法の計算効率改善のため、陰的な局所的一次元(LOD)法を導入した。また、周回方向の離散化のみに陰解法を用いるハイブリッド型半陰的円筒座標系FDTD法を開発した。以上の手法により、円筒型デバイスの計算時間が1/3～1/10に低減され、当初の目的が達成された。これらの手法を金属円盤形テラヘルツ表面波分割器の設計に応用し、GHz帯でデバイスを作成した。8～12.5GHzで放射パターンの測定をしたところ、計算結果と極めて良い一致を示し、設計の妥当性が確認できた。また、周波数分割の振る舞いが観察され、表面波分割の基礎的知見が得られた。 研究成果の概要 (英文) : In this project, we have introduced the locally one-dimensional scheme to improve the efficiency of the finite-difference time-domain (FDTD) method in cylindrical coordinates. In addition, we have developed a semi-implicit FDTD method in cylindrical coordinates, in which the implicit scheme is adopted only in the circumferential direction. Using these technique, the computation time is successfully reduced to 1/3 to 1/10 of that of the traditional explicit FDTD method in cylindrical coordinates. We have applied these methods to the design of a metal disc-shaped surface wave splitter and fabricated one at GHz frequencies. The radiation patterns were measured and compared with the numerical results obtained from the developed FDTD method in cylindrical coordinates. It has been found that the measured results agree well with the numerical results, demonstrating the validity of the design. We have also observed the behavior of the frequency splitting. |
| Databáze: | OpenAIRE |
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