Study On An Explicit-implicit Hybrid Time Domain Numerical Method For Analyzing The Crosstalk Characteristics Of Complex Cable Networks

With the continuous development of electronic information technology,electronic information systems in different platforms are becoming more and more powerful.At the same time,Electromagnetic Compatibility(EMC)and Electromagnetic Interference(EMI)suffered by the system are becoming more and more serious,which has aroused widespread concern in industry and academia.The electromagnetic environment of most electronic systems are becoming more complex due to the existence of various inside antennas,cables,transmission lines circuits,and even external electromagnetic interferences(EMI).The accurate analysis of the electromagnetic coupling effect requires accurate simulation of the coupling process at different levels of the electronic system,which can achieve system-level electromagnetic coupling effect collaborative simulation prediction.This paper conducts research on this issue.By establishing reasonable boundary conditions and using different solutions at different levels,the field-linecircuit of the complex cable network is quickly and effectively predicted.The main contents are as follows:Firstly,a hybrid time domain numerical method based on FDTD method combined with ADIFDTD has been proposed to analyze the electromagnetic interference(EMI)of multi-scale transmission line networks in this paper.This method is implemented through two numerical solver for full wave and transmission line simulations respectively by adopting a set of reasonable physical boundary conditions between spatial fields and electrical signal responses inside transmission line network.To overcome the challenge introduced by the multi-scale size of the transmission line network which has finer PCB level structures compared with the case of the electronic system,this paper combines FDTD and ADI-FDTD method together that the FDTD method is for full wave simulation and cable part of the transmission network and ADI-FDTD is for transmission lines in PCB board.Thus,among different sub-domains,the hybrid method can be carried with the same time step which can be without the restriction of the CFL stability condition.The research content of this paper is mainly as follows: Firstly,we proposed the FDTD method and the ADI-FDTD method of the transmission line,and these two methods are used for simulation under the condition of terminal linear load or non-linear load.Secondly,according to the complex characteristics of the typical communication system,this paper proposes a new hybrid time-domain finite-difference method for complex cable networks.The cables are processed using the FDTD method.The transmission lines on the PCB are processed using the ADI-FDTD method to better analyze the response of multi-scale cables,thereby achieving the entire Integrated simulation of multi-scale cable network inside the system.Finally,by studying the coupling among the external EMPs,the antennas,the cable network,as well as the internal circuits,we introduce some reasonable boundary conditions to connect the different coupling regions.Then,a novel hybrid field-line-circuit method,which takes into account the interaction between the field and the antennas,the field and the cables,the antennas and the cables,and the cables and the circuits,is proposed to predict and analyze the surge effects caused by all types of coupling on different levels.Numerical examples show the accuracy as well as efficiency of the proposed method compared with the HSPICE and traditional FDTD method.In addition,the method is used successfully in analyzing the EMI of an antenna-cable-interconnect illuminated by external electromagnetic pulse,providing an effective solution for the analysis of electromagnetic interference and shielding effectiveness of the system.