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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/10716

Title: 柱面週期性波導之特性研究及其作為微波防漏結構之應用
Analysis of Cylindrical Periodic Structures and Their Application as a Microwave Leakage Prevention Device
Authors: 李清和
Contributors: 電子工程學系
Keywords: 柱面週期性結構;波模匹配法;Floquet 原理;有限元素法;微波阻波器
Cylindrical periodic structure;Mode-matching method;Floquet's theory;Finite-element method;Waveguide choke
Date: 2002-08
Issue Date: 2012-05-29T01:23:37Z
Publisher: 行政院國家科學委員會
Abstract: 本計畫針對新型柱面式多層皺摺週期性結構之傳播特性作研究,所處理之柱面週期性皺摺結構的層數、厚度及介
電質係數在理論上可以任定。我們以兩種方法、分兩部份來進行解析。在第一部份中,我們以波模匹配法搭配Floquet
原理來分析具一維皺摺、中空之柱面週期性結構的傳播特性;所探討之結構包括皺摺為階梯狀及其變形如工字形、十字型乃
至極限形狀之三角形等,研究項目則包括結構之週期、皺摺層之厚度、寬度與材質對傳播特性之影響等。第二部份中我們採用有限元素法、並以現有軟體來進行模擬。除了作數值解析外,我們亦將探討以其作為微波阻波器之設計,以作為工業用微波加熱爐進出口防漏組件之用。預期本研究之成果將可作為設計新型非平面式微波濾波器或截止波導之有用之參考。
In this project, the propagation characteristics of a cylindrical periodic structure will be investigated. The structure has periodical corrugation in the
cladding and empty in the center. Furthermore, the corrugation may be of arbitrary shape and thickness, and could be one-dimensional or two-dimensional. The outermost layer of the cylindrical periodic structure is shielded by a perfect conductor. We will divide this project into
two parts, and use two different approaches for analysis. In the first part, mode-matching technique (MMT) in conjunction with the Floquet’s theory are utilized for theoretical analysis. The considered structures include those with corrugations of staircase shape, “I”-shape,“+”-shape, and the limiting geometry of triangle shape. The effects of structure period, the corrugation width and depth, and the material parameters on the
dispersion behavior will be investigated. In the second part, we apply the finite-element method for analysis, and use existing software for numerical solution. Besides the theoretical analysis, the corrugated cylindrical periodic structure are designed to serve as a wave-leakage prevention device in the entry and exit ports of an industrial microwave oven. We will examine the attenuating effects due to the corrugation
shape, structure period and total length as the wave is propagating through the waveguide choke. Results obtained in this research are expected to serve as useful references for researchers and designers working in this field.
Relation: 計畫編號:NSC91-2213-E018-002; 研究期間:200208-200307
Appears in Collections:[電子工程學系] 國科會計畫

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