雙頻圓極化微波極化器設計

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姓名

謝子皓(Tzu-Hao Hsieh) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

雙頻圓極化微波極化器設計
(Design of Dual-Band Circularly Polarized Microwave Polarizer)

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至系統瀏覽論文 ( 永不開放)

摘要(中)

本論文提出了一套將線性極化轉圓形極化的雙頻圓極化頻率選擇面極化器設計方法，該設計方法依循著頻率選擇面的等效電路設計。論文中雙頻圓極化器設計過程中結合濾波器設計觀念，以等效電路法來合成出雙頻頻率選擇面濾波器適合的電路，而在等效電路設計上擁有相當大的自由度，包含中心頻率、頻寬、基板選用…等，可依照設計者需求自由決定，並且在電路設計階段就能以等效電路預測雙頻圓極化器的軸比特性。在等效電路建立完成之後，以雙層複合型頻率選擇面設計雙頻圓極化器，其複合結構包含耶路撒冷槽孔與四組一字型槽孔，論文中也以全波模擬軟體與實驗來驗證設計理論。本論文製作之雙頻圓極化器量測結果所涵蓋的3dB圓極化頻帶為8.55 GHz到9.25 GHz與11.7 GHz到12.4 GHz，相對於兩組設計之中心頻率9 GHz與12 GHz，其3 dB軸比頻寬分別為7.8 %與5.8 %，且全波模擬與量測結果有良好的吻合度。本論文所設計完成的雙頻圓極化器可應用於X頻段的衛星通訊系統。

摘要(英)

In the thesis, a novel design of dual-band circularly polarized polarizer which can convert linear polarization to circular polarization will be present. The frequency selective surface (FSS) design procedure is based on filter synthesizing equivalent circuit. Filter synthesizing method provides design freedom, including the center frequency, band width, substrate selection and so on. A second order Butterworth dual-band filter design procedure is applied for synthesis of dual-band circularly polarized polarizer. Base on the second order Butterworth dual-band equivalent circuit model, a simple composite unit cell including Jerusalem cross shaped slot and four straight slots are used to realize circularly polarized FSS. The validity of the procedure is verified using full-wave EM simulations and experimental characterization of a fabricated prototype of the proposed dual-band circularly polarized polarizer. The measured 3-dB axial ratio (AR) bandwidth of the proposed dual-band circularly polarized polarizer can cover 8.55 to 9.25 GHz (7.8% with respect to 9 GHz) and 11.7 to 12.4 GHz (5.8% with respect to 12 GHz). The proposed dual-band circularly polarized polarizer can be used in X-band satellite communications systems.

關鍵字(中)

★ 頻率選擇面

關鍵字(英)

★ frequency selective surface

論文目次

摘要 i
Abstract ii
致謝 iii
圖目錄 vi
表目錄 xi
第一章緒論 1
1-1 研究動機 1
1-2 文獻回顧 3
1-3 章節介紹 5
第二章單通道雙頻頻率選擇面設計 6
2-1 簡介 6
2-2 單通道雙頻頻率選擇面等效電路 7
2-2-1 一階單頻帶通濾波器 7
2-2-2 ㄧ階雙頻帶通濾波器 8
2-2-3 二階單頻帶通濾波器 11
2-2-4 二階雙頻帶通濾波器 15
2-3 單通道雙頻頻率選擇面之電磁模擬 18
2-3-1 頻率選擇面尺寸參數分析 18
2-3-2 一階雙頻帶通濾波器 29
2-3-3 二階雙頻帶通濾波器 30
2-4 結論 35
第三章雙頻圓極化器設計 36
3-1 簡介 36
3-2 雙頻圓極化器等效電路設計 38
3-2-1 雙通道二階雙頻帶通濾波器 38
3-2-2 雙通道二階雙頻帶通濾波器電路最佳化 45
3-3 雙頻圓極化器設計 46
3-3-1 二階雙頻圓極化頻率選擇面 46
3-3-2 二階雙頻圓極化器斜向入射分析 54
3-4 結論 58
第四章量測結果 59
4-1 簡介 59
4-2 平面波透射頻率選擇面之量測 59
4-3 天線饋入頻率選擇面之量測 64
4-4 結論 81
第五章總結 82
參考文獻 83
附錄 87

參考文獻

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指導教授

丘增杰(Tsen-Chieh Chiu)

審核日期

2013-7-25

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