A Hybrid Method Based on Leapfrog ADI-FDTD and FDTD for Solving Multiscale Transmission Line Network

• Published in: IEEE journal on multiscale and multiphysics computational techniques Vol. 5; pp. 273 - 280
• Main Authors: Wang, Ying, Wang, Jian, Yao, Lu, Yin, Wen-Yan
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Boundary conditions; Business government relations; Coaxial cables; Finite difference methods; Finite difference time domain method; Hybrid finite-difference time-domain (FDTD) method; leapfrog alternating direction implicit finite-difference time-domain (ADI-FDTD) algorithm; multiscale problem; Power transmission lines; Printed circuits; Railway networks; Time domain analysis; Transient response; transmission line network; Transmission lines
• ISSN: 2379-8815; 2379-8815
• DOI: 10.1109/JMMCT.2020.3046273

This article proposes a novel hybrid finite-difference time-domain (FDTD) method to calculate the transient responses of the transmission line network based on the leapfrog alternating direction implicit FDTD (leapfrog ADI-FDTD) algorithm and the traditional FDTD method. The proposed hybrid method can be implemented by dividing the transmission line network into two parts that are the interconnects part in a printed circuit board solved by the leapfrog ADI-FDTD and the cable part solved by the traditional FDTD with different mesh sizes and the same time step, respectively. In addition, some boundary conditions should be introduced based on the modified nodal approach and Kirchhoff's law at the terminals of the transmission line network. The numerical results show that the proposed hybrid method is in good agreement with HSPICE. Especially, it is more efficient and applicative for the multiscale transmission line network problems due to the use of the implicit FDTD solver with unconditional stability compared with the traditional FDTD method.