基于测量S参数的有源器件FDTD建模方法

FDTD Modeling of Active Devices Characterized by Measured S-Parameters

该文提出了一种新的基于测量s参数的有源器件FDTD建模方法。该方法借助于矢量拟合技术(VF)和分段递推卷积技术(PLRC)完成建模,不必知道器件的等效电路,并保留了传统FDTD算法显式差分的特点,得到了一般性的FDTD迭代公式。另外,该方法的数据处理过程主要在所需频段内操作,避免了传统方法中由直接逆傅里叶变换所引起的非因果时域误差。对于全波分析包含实际有源器件的微波电路具有一定的实用价值。

A novel FDTD modeling approach for active devices characterized by measured S-parameters is presented. This approach applies Vector Fitting （VF） technique and Piecewise Linear Recursive Convolution （PLRC） technique to complete modeling process, and does not need to know the equivalent circuits of active devices. It preserves the explicit nature of the conventional FDTD method, and obtains a general updated formula. Furthermore, the main data-processing procedure is directly handled over the frequency band of interest, which avoids the time-domain non-causal error in traditional techniques. It is useful to full-wave analyze hybrid microwave circuits including practical active devices.