結合網路與時域有限差分法應用於方形波導內有限週期結構之分析

Abstract

起因於波導的不連續面激發出的消散模態及高階度模態，單週期結構的傳導矩陣不能被考慮為在綱路近似法中的單位元素去精確地表示週期結構的傳導性質。為了去克服在數值運算計劃中的限制，本論文提出修正的綱路近似法可以在不失準確性的情況下應用於分析方形波導內有限週期結構。這種近似法可以在時域差分的模擬演算中實質上地節省電腦處理器的運算時間和記憶儲存體的需求。

Due to the evanescent modes and higher order mode interaction excited by the waveguide discontinuities, the transmission matrix of single - period structure can not be considered as unit element in the network approach to represent the transmission propeties of periodic structures precisely. In oreder to overcome the limitation of the computational scheme, this paper proposes a modified network approach which is applied to the analysis of finite periodic structures in rectangular waveguides without loss of accuracy. This results in a substantial savings in CPU time and memory storage requirements in the FDTD simulation.