A Novel Adaptive FDTD Method for Analyzing Three-Dimensional Curved Conducting Objects with the Coating

• Main Authors: Chih-Ming Kuo, 郭智明
• Other Authors: Chih-Wen Kuo
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/89659883348547156655

博士 === 國立中山大學 === 電機工程學系研究所 === 102 === The chief shortcoming of the conventional conformal finite-difference time-domain (CFDTD) method is a global time step reduction to ensure stability, due to the small irregular cells truncated by the curved conducting geometry. In this dissertation, we employ the concept of the equivalent material constants into the integral form of Faraday’s law to analyze the curved configuration with the coating. Hence, we can theoretically derive the stability criterion of each irregular cell based on the same procedure for the Courant-Friedrichs-Lewy (CFL) stability criterion. Therefore, the local time step size of each small irregular cell can be chosen adaptively. An adaptively adjusted time-stepping procedure is presented and is theoretically proven to ensure numerical stability. The radar cross section (RCS) results of various curved conducting objects with the coating are computed. Comparisons of accuracy and efficiency of our method with other established methods are performed.