臺灣博碩士論文加值系統

本論文在於探討鼻錐罩之頻率選擇面(frequency selective surface, FSS)的設計，首先，探討鼻錐罩本身厚度對平面波接收的影響，透過穿過鼻錐罩後的輸入反射係數(穿透係數)做一個分析比較。另一方面，當鼻錐罩受到雷達波照射時，雷達波散射訊號能量與鼻錐罩形狀息息相關，雷達散射截面積(Radar cross-section, RCS)為量化反射電磁波能量強弱之參數；RCS越小，雷達就越不易探測到目標。其次，設計一個性能穩定的FSS幾何陣列，利用此幾何陣列建構一個圓錐形的FSS天線罩，其與內單極天線的組合，在模擬結果中可以了解，該過濾器天線保持輸入反射係數，內單極天線的輻射圖設計通帶，並且反射出的帶外信號。這樣屬性的過濾器，天線將表現出高抗干擾能力和低RCS，可廣泛應用在軍事用途上。天線輻射出之電磁波通過FSS時，將改變其輻射效率與方向，故鼻錐罩上之頻率選擇面設計須評估其對電磁波之散射及內部天線輻射之影響。本論文中週期單元(unit cell)採用適用於不同極化之電磁波應用之十字形槽孔(cross slot)結構; 效益分析上，採用商用電磁高頻數值分析技術輔以全波(full-wave)電磁模擬，計算頻率選擇平面結構於平面波之照射下之功率反射係數與穿透係數等頻率響應參數，並以平面與曲面FSS結構之介入損耗(insertion loss)、指向偏移(boresight error)及雷達截面積(radar cross section)等特性參數變異為評估依規，建立曲面FSS設計之準則，此準則可應用於複雜三維FSS之開發。

This collaborative project aims for the development of the three-dimensional curved frequency selective surface (FSS) in a Von Karman shape. The project calls for joint effort from Yuan Ze University and the Chung-Shan Institute of Science and Technology. The geometrical information of the FSS will be provided by the Chung-Shan Institute of Science and Technology, and the design, characterization, and the verification of the FSS will be carried out by Yuan Ze University. The parametric study on the insertion loss, boresight error, and radar cross section of the
proposed FSS will be performed. The symmetric Jerusalem-cross type unit cell is adopted for the FSS development to minimize the characteristics variation from wave polarization. The proposed FSS is characterized with the power transmission and reflection coefficients obtained from the finite-element-based commercial full-wave solver, HFSS, and equivalent transmission-line technique. Also, the variation on both coefficients with respect to the wave polarization will be investigated. The proposed FSS will be fabricated for experimental verification.

書 名 頁
論文授權書
論文口試委員審定書
摘 要 I
ABSTRACT II
誌 謝 III
目 錄 V
圖 目 錄 VII
第一章 緒論 1
1.1 研究動機與目前應用 1
1.2 章節概述 3
第二章 名詞簡介和理論原理 4
2.1頻率選擇平面 4
2.2 Von Karman三維圓錐面型鼻錐罩 7
2.3 雷達截面積 8
2.4 天線參數 8
第三章 鼻錐罩厚度對電磁波穿透特性之設計探討 19
3.1不等厚鼻錐罩之結構設計 20
3.1.1 Case1 20
3.1.2 Case2 26
3.1.3 Case3 30
3.2 等厚鼻錐罩之結構設計 33
3.3 厚度對電磁波穿透性之影響 35
3.4 鼻錐罩對電磁波散射分析 38
第四章 鼻錐罩之頻率選擇面模擬成果及分析 42
4.1曲面FSS之擇頻特性分析 42
4.2 Von Karman FSS之擇頻特性分析 47
4.3鼻錐罩FSS對天線輻射與散射影響 51
4.4鼻錐罩對天線輻射場型影響分析 54
第五章 結論 58
參考文獻 60
附錄 62
Case1: MATLAB主要程式內容 62
Case2: Matlab 主要程式內容 64
Case3: Matlab 主要程式內容 66

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