The Unconditionally Stable Associated Hermite FDTD Method With Thin Wire Modeling

2021 ◽  
pp. 1-4
Author(s):  
Zi-An Chen ◽  
Shao-Bin Liu ◽  
Zheng-Yu Huang ◽  
Li-Hua Shi ◽  
Ya-Tong Hou
Keyword(s):  
Fdtd Method ◽  
Thin Wire ◽  
Unconditionally Stable

An efficient hybrid method for analyzing the coupling response of microstrip antenna system

2021 ◽  
pp. 1-14
Author(s):  
Xiao Hu ◽  
Yang Qiu ◽  
Qing-Lin Xu ◽  
Jin Tian
Keyword(s):  
Hybrid Method ◽  
Microstrip Antenna ◽  
Fdtd Method ◽  
Antenna System ◽  
Reciprocity Theorem ◽  
Thin Wire ◽  
Equivalent Source ◽  
Impedance Model ◽  
Antenna Coupling ◽  
Lorentz Reciprocity Theorem

This paper presents an efficient hybrid method consisting of Lorentz reciprocity theorem, finite-difference-time-domain (FDTD) method, thin wire model, transmission line (TL) equations and transfer impedance model, which can be utilized to analyze the system-level transient responses of the microstrip antenna system with antenna, metallic enclosures, braided shielded cable, and lumped element, when illuminated by an external electromagnetic pulse (EMP). In order to avoid over-fine mesh generation and repeated modeling of the antenna in multiple simulations, Lorentz reciprocity theorem is employed to extract an equivalent source model of antenna coupling, thereby improving the computational efficiency. Then, the transfer impedance model and thin wire model are incorporated into the FDTD-TL method efficiently to deal with the back-door coupling through the shielding layer of feeding coaxial cable. Finally, the hybrid FDTD method combined with the extracted equivalent source of antenna coupling is utilized to solve the coupling responses of the whole antenna system. The results of numerical simulation are verified by comparing with the simulation results of CST CS. Then, considering the influence of different incident conditions of external EMP, the characteristics of the coupling response of the system are analyzed. The obtained coupling response information demonstrate that the proposed method is available for further designing electromagnetic protection of the inner circuits of the microstrip antenna system against the impact of external EMP.

An unconditionally stable FDTD method based on wave equation

2008 ◽  
Vol 51 (2) ◽  
pp. 529-532 ◽  
Author(s):  
Hai Lin ◽  
Gaofeng Wang ◽  
Feng Liang
Keyword(s):  
Wave Equation ◽  
Fdtd Method ◽  
Unconditionally Stable

scholarly journals Unconditionally stable WLP-FDTD method for the modeling of electromagnetic wave propagation in gyrotropic materials

2015 ◽  
Vol 23 (25) ◽  
pp. 31864
Author(s):  
Zheng-Wei Li ◽  
Xiao-Li Xi ◽  
Jin-Sheng Zhang ◽  
Jiang-fan Liu
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Unconditionally Stable

scholarly journals From Time-Collocated to Leapfrog Fundamental Schemes for ADI and CDI FDTD Methods

Axioms ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Eng Leong Tan
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Unconditionally Stable ◽  
Alternating Direction Implicit ◽  
One Dimensional ◽  
Alternating Direction ◽  
Fdtd Methods ◽  
Difference Time

The leapfrog schemes have been developed for unconditionally stable alternating-direction implicit (ADI) finite-difference time-domain (FDTD) method, and recently the complying-divergence implicit (CDI) FDTD method. In this paper, the formulations from time-collocated to leapfrog fundamental schemes are presented for ADI and CDI FDTD methods. For the ADI FDTD method, the time-collocated fundamental schemes are implemented using implicit E-E and E-H update procedures, which comprise simple and concise right-hand sides (RHS) in their update equations. From the fundamental implicit E-H scheme, the leapfrog ADI FDTD method is formulated in conventional form, whose RHS are simplified into the leapfrog fundamental scheme with reduced operations and improved efficiency. For the CDI FDTD method, the time-collocated fundamental scheme is presented based on locally one-dimensional (LOD) FDTD method with complying divergence. The formulations from time-collocated to leapfrog schemes are provided, which result in the leapfrog fundamental scheme for CDI FDTD method. Based on their fundamental forms, further insights are given into the relations of leapfrog fundamental schemes for ADI and CDI FDTD methods. The time-collocated fundamental schemes require considerably fewer operations than all conventional ADI, LOD and leapfrog ADI FDTD methods, while the leapfrog fundamental schemes for ADI and CDI FDTD methods constitute the most efficient implicit FDTD schemes to date.

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