用時域有限差分法研究圓柱形諧振器
STUDY OF 3-D CYLINDRICAL RESONATORS WITH FD-TD METHOD
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摘要: 本文建立了圓柱坐標(biāo)系下的時域有限差分(FD-TD)算法程序。運用算法分析了幾種圓柱形諧振器(包括同軸形,圓柱形介質(zhì)加載和開放式柱形介質(zhì)諧振器)在各種模式下的諧振頻率。數(shù)值結(jié)果與理論值、實驗值進行了比較,表明具有很高的精度。本文還對計算中網(wǎng)格的選取原則進行了探討;并計算了一種雙層介質(zhì)加載腔的諧振頻率,從中得出一些有益的結(jié)論。
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關(guān)鍵詞:
- 諧振腔; 時域有限差分; 離散傅里葉變換
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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