用时域有限差分法研究圆柱形谐振器
STUDY OF 3-D CYLINDRICAL RESONATORS WITH FD-TD METHOD
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摘要: 本文建立了圆柱坐标系下的时域有限差分(FD-TD)算法程序。运用算法分析了几种圆柱形谐振器(包括同轴形,圆柱形介质加载和开放式柱形介质谐振器)在各种模式下的谐振频率。数值结果与理论值、实验值进行了比较,表明具有很高的精度。本文还对计算中网格的选取原则进行了探讨;并计算了一种双层介质加载腔的谐振频率,从中得出一些有益的结论。
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关键词:
- 谐振腔; 时域有限差分; 离散傅里叶变换
Abstract: A program which can calculate resonant frequencies with arbitrary modes by FD-TD method coupled with the discrete Fourier transform is set up. Several resonators including coaxial resonators, empty cylindrical resonators, dielectric loaded cylindrical resonator and dielectric resonator are studied by this method, especially the spurious mode s resonant frequencies of the coaxial cavity are obtained. The numerical results are in excellent agreement with the rigorous theoretical solutions and experimental results. The resonant frequencies of a kind of two-layer dielectric-loaded cavity are also studied and some useful results are obtained. -
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