Unintentional as well as intentional electromagnetic interference can cause interference and performance degradation of microwave circuits or systems. In this article, a modified multiport lumped-network finite-difference time-domain method (FDTD) method based on Y-matrix is proposed, where bilinear transform is used to incorporate the V–I relation of the lumped-network into FDTD iteration. It is further used for simulating transient responses of mesfet -based amplifiers, which are often used in many radar and communication systems. The excitation of such an RF amplifier is assumed to be an intentional electromagnetic interference (IEMI) signal but with different waveforms and magnitudes. Parametric studies are performed to show hybrid effects of waveforms and magnitudes of the IEMI signals on the transient coupled voltages at the output port of such mesfet -based amplifier, with useful information obtained for understanding the interaction process between the intentional electromagnetic interference signals and active components.

中文翻译：

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模拟由有意电磁干扰信号激发的射频放大器瞬态响应的集总网络FDTD方法

无意和有意的电磁干扰都可能导致微波电路或系统的干扰和性能下降。在本文中，提出了一种基于 Y 矩阵的改进的多端口集总网络有限差分时域方法 (FDTD) 方法，其中使用双线性变换来合并集总网络与 FDTD 迭代的 V-I 关系。它进一步用于模拟瞬态响应基于 mesfet 的放大器，通常用于许多雷达和通信系统。假设这种射频放大器的激励是有意的电磁干扰 (IEMI) 信号，但具有不同的波形和幅度。执行参数研究以显示 IEMI 信号的波形和幅度对此类输出端口处的瞬态耦合电压的混合影响。基于 mesfet 的放大器，可以获得有用的信息，用于理解有意的电磁干扰信号和有源组件之间的交互过程。