| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
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.
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