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Fast modal ABC's in the hybrid PEE-FDTD analysis of waveguide discontinuities

机译:波导不连续性的混合PEE-FDTD分析中的快速模态ABC

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摘要

The authors discuss the application of two types of fast modal absorbing boundary conditions (ABC's) to the analysis of waveguide discontinuities by means of the hybrid partial eigen-function expansion finite-difference time-domain (PEE-FDTD) method. For low-order modes, ARX digital filters are used while higher order modes are terminated with simplified ABC's based on the evanescent nature of modes below cutoff. Numerical tests show that this approach gives a very good absorption of modes while allowing one to achieve significant acceleration of numerical computation compared to classical FDTD scheme.
机译:作者讨论了两种类型的快速模态吸收边界条件(ABC's)在通过混合局部本征函数展开有限差分时域(PEE-FDTD)方法进行波导不连续性分析中的应用。对于低阶模式,使用ARX数字滤波器,而高阶模式则根据低于截止值的模式的渐逝性以简化的ABC终止。数值测试表明,与传统的FDTD方案相比,该方法可以很好地吸收模式,同时可以大大加快数值计算的速度。

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