电子设备贯通导线的电磁耦合时域分析算法

doi:10.3969/j.issn.1001-506X.2020.08.05

摘要/Abstract

摘要：

目前,应用于电子设备贯通导线电磁耦合分析的数值算法仍比较缺乏。基于时域有限差分(finite difference time domain, FDTD)方法和传输线方程,并结合诺顿定理,提出了一种高效的时域混合算法,用于解决电磁波作用于电子设备贯通导线的电磁耦合问题。首先,将贯通导线按照电子设备屏蔽腔结构分解为内、外传输线。然后,采用FDTD方法结合传输线方程,构建内外传输线的电磁耦合模型,并求得内外传输线上的瞬态响应。最后,根据诺顿定理建立贯通导线的等效电路模型,解决内外传输线之间的阻抗不匹配问题,并实现干扰信号在贯通导线上的来回传输。采用该时域混合算法,对电磁波作用自由空间和屏蔽腔内电子设备贯通导线的电磁耦合进行数值模拟,并与传统FDTD方法进行比较,验证了算法的正确性和高效性。

关键词: 电子设备, 贯通导线, 时域有限差分方法, 传输线方程, 诺顿定理

Abstract:

At present, the numerical methods are lack seriously which are used for the electromagnetic coupling analysis of electronic device with penetrated wire. Therefore, an efficient time domain hybrid method is presented consisting of finite difference time domain (FDTD) method, transmission line (TL) equations and Norton theory to solve the electromagnetic coupling problem of electronic device with penetrated wire. In this method, the penetrated wire of electronic device is divided into external and internal transmission lines according to the shielded enclosure of device firstly. Then, the FDTD method combined with the TL equations is used to build the electromagnetic coupling models of external and internal transmission lines and obtain the transient responses on the lines, respectively. Finally, the equivalent circuit model of the penetrated wire is established by the Norton theory, which can solve the impedance mismatch between external and internal transmission lines, and achieve the transmission of interference signals on the penetrated wire. The accuracy and efficiency of the presented method are verified via the numerical simulations of electromagnetic coupling of the penetrated wire in the free space and shielded cavity by comparing with the traditional FDTD method.

Key words: electronic device, penetrated wire, finite difference time domain (FDTD) method, transmission line equation, Norton theory

中图分类号:

TM15

叶志红, 石艳超, 周健健. 电子设备贯通导线的电磁耦合时域分析算法[J]. 系统工程与电子技术, 2020, 42(8): 1673-1678.

Zhihong YE, Yanchao SHI, Jianjian ZHOU. Time domain analysis algorithm of electromagnetic coupling of penetrated wire connecting to electronic device[J]. Systems Engineering and Electronics, 2020, 42(8): 1673-1678.

图/表 12

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