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研究生:陳劭宜
研究生(外文):Shao-Yi Chen
論文名稱:應用基因演算法最佳化波導管功率分配器與號角天線設計
論文名稱(外文):Optimization of Waveguide Power Dividers and Horn Antennas by Genetic Algorithm
指導教授:周錫增
學位類別:碩士
校院名稱:元智大學
系所名稱:通訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:91
中文關鍵詞:基因演算法最佳化波導管功率分配器號角天線
外文關鍵詞:genetic algorithmoptimizationwaveguide power dividercorrugated horn
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本篇論文利用基因演算法發展出一套自動化的最佳化程式,能分別整合商用電磁模擬軟體CST以設計波導管功率分配器,以及整合商用電磁模擬軟體HFSS應用於設計線性極化號角天線。於波導管功率分配器設計中,我們利用基因演算法來執行幾何架構的最佳化運算,以獲得低反射功率、低傳輸功率損耗、指定輸出功率分配比例之模擬結果,並經由等效電路分析方法來驗證之;或者利用前人提出之架構,我們將可於簡短的時間內,設計調整出效能更優化之波導管功率分配器。在號角天線的設計中,為了因應現今衛星通訊之需求,我們選擇以瓦楞狀號角天線為基本架構,進一步探討發展出其他架構之可行性,並且藉由自動化之最佳化程式,將可減少設計調整繁複架構的尺寸變數時所耗費的時間,並達到天線場形高度對稱性、低反射訊號、與指定波束寬之圓極化天線效能。
This thesis develops a genetic algorithm (GA) based optimization procedure which can be integrated with CST, HFSS, the commercial EM software, to design the waveguide power dividers and linearly polarized horn antennas. In order to achieve the low reflected low power, transmission loss and desired result of power division, GA is utilized to adjust the component structure which the commercial codes are used to perform the analysis. Also the method of equivalent circuit is used to initiate the design. From the proposed models, we can design a waveguide power divider with better performances in a short time. About the design of horn antenna, we select the corrugated horn antenna as a model for the applications of modern satellite communication. This code allows one to optimize the structures models which have symmetrical patterns, low reflected signals, and desired beamwidth of circularly polarized antenna. Numerical examples demonstrate the efficiency of the design procedure!
致謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 序論
1.1 簡介 1
1.2 章節概述 2
第二章 最佳化程式設計
2.1 基因演算法概述 3
2.2 基因演算法架構 3
2.2.1 基因擇優機制 6
2.2.2 基因交配機制 7
2.2.3 基因突變機制 9
2.3 程式工作流程 10
第三章 波導管功率分配器設計
3.1波導管功率分配器簡介 14
3.2波導管功率分配器最佳化程式描述 15
3.3 步階式波導管功率分配器 17
3.3.1 步階式波導管功率分配器特性與原理 17
3.3.2 步階式波導管功率分配器架構 19
3.3.3 步階式波導管功率分配器模擬結果與討論 22
3.4 Magic-T (幻-T)波導管功率分配器 25
3.4.1 Magic-T波導管功率分配器特性與原理 25
3.4.2 Magic-T波導管功率分配器架構 27
3.4.3 Magic-T波導管功率分配器模擬結果與討論 30
第四章 瓦楞狀(Corrugated)號角天線設計
4.1 號角天線特性與原理 35
4.2 號角天線最佳化程式描述 37
4.3 瓦楞狀號角天線 39
4.3.1 圓錐形號角天線 39
4.3.2 瓦楞狀號角天線架構與設計原理 41
4.3.3 瓦楞狀號角天線模擬結果與討論 51
4.4 弦波瓦楞狀(Sin-shape)號角天線 65
4.4.1 橢圓形瓦楞狀號角天線 65
4.4.2 弦波瓦楞狀號角天線架構與設計原理 68
4.4.3 弦波瓦楞狀號角天線模擬結果與討論 72
第五章 結論 77
參考文獻 78
附錄A 80
附錄B 85
作者簡介 91
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[21] S. J. Cook, N. C. Garner, “Die-Castable Corrugated Horns Providing Elliptical Beams,” Patent Number: U.S. 5552797, September 1996.
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