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標題: | 利用最佳化方法設計超寬頻平面單極天線 Applications of Optimization Techniques to Designs of Ultra-Wideband Planar Monopole Antennas |
作者: | Wei-Hsiang Chou 周瑋翔 |
指導教授: | 陳士元(Shih-Yuan Chen) |
關鍵字: | 二位元粒子群最佳化演算法、實驗設計法、平面單極天線、拓樸最佳化、超寬頻, Binary particle swarm optimization, design of experiments, planar monopole antennas, topology optimization, and ultra-wideband, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 本論文分別利用兩種最佳化方法來系統化超寬頻平面單極天線之設計,並簡化設計流程。本論文中,超寬頻天線之設計目標主要使所設計之天線於3.1 GHz至10.6 GHz之超寬頻帶內具有良好的阻抗匹配;此外,也在5.15 GHz至5.825 GHz頻帶內產生止帶。第一個方法是採用實驗設計法針對預先設定的天線幾何結構進行其尺寸之最佳化設計。實驗設計法利用變異數分析得到一個可以用來預測天線效能之回歸模型,該回歸模型為天線結構參數之簡單函數。經由回歸模型可以找到一系列滿足設計目標之天線結構參數組合,以達到尺寸最佳化之目的。該回歸模型之準確性亦經由全波模擬證實。第二個方法則是採用二位元粒子群最佳化演算法,針對預先給定之設計區域進行拓樸最佳化設計。我們先將平面方形單極天線的方形單極金屬片切割成一百個小方格,每一個小方格可以佈滿金屬或空氣,接著利用二位元粒子群最佳化演算法找出每一個小方格對應之金屬/空氣組態,使所得到之網格天線結構具有滿足設計目標之工作效能。以上兩種方法均分別應用在一般型及止帶型超寬頻平面單極天線之最佳化設計上,且所得到之天線設計也都經由實驗驗證其效能。 In this thesis, two optimization methods are respectively applied to achieve systematic approach for the design of ultra-wide band (UWB) planar monopole antennas and simplify the design procedure. The design goals for UWB antennas are to exhibit good matching in the UWB band which is from 3.1 GHz to 10.6 GHz and a narrow-band frequency notch in the wireless local area network (WLAN) band which is from 5.15 GHz to 5.825 GHz in this thesis. The first method is to apply design of experiments (DOE) technique in the size optimization of the predefined antennas’ geometric structure. By DOE, the regression models, which are the simple functions of antennas’ geometric parameters, can be attained via the analysis of variance (ANOVA) for predicting the performance of the antennas. With these models, we can work out a series of antennas’ geometric parameters which meet the design goals to achieve the size optimization. The accuracy of the regression models is verified via full-wave simulations. The second method is to apply binary particle swarm optimization (BPSO) algorithm in the topology optimization of the antennas with the predefined design region. For a start, we divided the metal patch of a planar rectangular monopole antenna into one hundred small square meshes which can be filled with metal or air. Next, the corresponding metal/air state of each square mesh is found by BPSO algorithm to get a pixelized antenna configuration whose performance meet the design goals. The above two methods are respectively applied to optimize the design of the ordinary and the band-notched UWB planar monopole antennas. The performance of each antenna design is also verified by way of experiments. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63847 |
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顯示於系所單位: | 電信工程學研究所 |
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