卷积完全匹配层截断3维金属矩形波导的应用研究
Truncation of open boundary of 3D rectangular waveguide by CPML
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摘要: 讨论了高功率微波源模拟中波导开放边界截断的需求，分析了不同类型完全匹配层(PML)的特点，选用卷积形式PML截断色散波导器件的开放边界。从自由空间电磁波的平面波解和分裂形式的PML出发，构造了未分裂形式的PML，用傅里叶变换的卷积定理，导出了直角坐标系下卷积完全匹配层(CPML)介质中电磁场的迭代形式的离散方程。在不同频率和模式激励源作用下，模拟计算了CPML截断矩形波导开放边界的性能，数值结果表明最大相对误差都小于-70 dB，远好于Mur吸收边界的截断效果。Abstract: The requirement for truncating the open boundary of waveguide used in the simulation of high power microwave (HPM) sources was discussed. The characteristics of different types of perfectly matched layer (PML) was analyzed, and the convolutional PML was chosen to truncate open boundary of the dispersive waveguide device. The unsplit-field PML was constructed using the split-field PML and the plane-wave solution of electromagnetic field in free space. By applying the convolutional theorem of Fourier transform, the discrete iterative equations of electromagnetic field in the CPML media in the rectangular coordinate system was presented. The performance of CPML was simulated when it was used to truncate the rectangular waveguides excited by the sources with different frequencies and modes. Th
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Key words:
- convolutional perfectly matched layer /
- fdtd /
- particle simulation /
- rectangular waveguide /
- truncation
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