A Novel Field-Line-Circuit Hybrid Algorithm for Transient Responses Prediction of Transmission Lines Based on FDTD Method

Abstract

Abstract-A novel field-line-circuit hybrid algorithm based on finite difference time domain (FDTD) method is devoted to predicting the electromagnetic responses of transmission line with multi-ports network in a shelter in this paper. The full wave FDTD method, transmission line FDTD method, and the modified nodal analysis (MNA) are combined to be compatible with the multi-level electromagnetic (EM) coupling progress of the electromagnetic interference (EMI) problem. The proposed method divides the EM couplings among the spatial EM fields, antennas, transmission line networks, and terminal circuits in some typical electronic systems into different levels with appreciate simulation techniques used. The accuracy of the hybrid method is verified by comparing the terminal transient voltage responses of transmission lines with the results obtained by PSPICE, and good agreements are achieved. Numerical calculations are further performed to show the terminal coupling voltages and currents, and the effects of incident directions and polarizations of the illuminated electromagnetic pulse (EMP) are both taken into account.

Transient Response of Microstrip Patch Antenna Loaded on a Vehicle Platform Illuminated by Electromagnetic Pulse

“…In [12][13][14][15], the transient response in the time domain (TD) of monopole or dipole antenna illuminated by EMP is captured with different methods. Taking the influence of other factors in the system into account, the system TD response of a metallic enclosure with thin-wire antenna and transmission line is predicted based on hybrid FDTD method in [16][17][18][19]. However, these studies are only aimed at simple thin wire antennas.…”

Coupling analysis of multiple linear antennas fed by coaxial lines on electronic system with a time domain hybrid method

“…Under this circumstance, these methods must waste amount of grids by meshing the whole structure of electronic system, which should decrease the computation efficiency of these methods. Based on this, an antenna‐cable coupling method has been proposed . In this method, equivalent magnetic‐frill current at the antenna port is exacted by the thin wire FDTD method firstly, and then the transmission line theory is applied to build the coupling model of coaxial line excited by the current source, and solved by the central difference scheme of FDTD method.…”

“…Based on this, an antenna-cable coupling method has been proposed. 6,7 In this method, equivalent magnetic-frill current 8 at the antenna port is exacted by the thin wire FDTD method firstly, and then the transmission line theory is applied to build the coupling model of coaxial line excited by the current source, and solved by the central difference scheme of FDTD method. The feature of this method is that it can avoid modeling the structure of coaxial line directly.…”