臺灣博碩士論文加值系統

奈微米粒子混成於有機高分子樹酯母材，已成為有效的電磁波吸波材料。由於奈微米粒子對於電磁波有敏銳的頻率響應特性，所產生的近場作用使得一般傳統電磁波理論計算難以正確預測。因此，本研究以考量近場因子納入電磁波響應計算理論進行研究，使理論和實務相結合，達到寬頻段吸波奈米塗料設計之目標。藉助理論計算調整吸波塗料之厚度對不同電磁波段響應特性，以預估各厚度之混成塗料，在那一段頻率中將具電磁波吸收特性。另外，亦將近場因子作用納入類比電路考量，計算吸波材料所製作成之頻率選擇表面的吸收頻率和寬頻特性，有助未來設計質輕、吸波優異之吸波材料特性。本論文利用類比電路法，將頻率選擇表面上不同週期陣列幾何圖形之電磁特性，以等效電阻、等效電感、等效電容做串聯或並聯之表示，添加耦合理論計算吸波效能，並改變週期圖案、尺寸大小厚度間距等參數，模擬與分析吸波效能。

Particle-hybrid polymer composites have been widely used to absorb electromagnetic wave. The particles in the matrix are able to response the electromagnetic wave and cause the near field coupling. Therefore, in this study, the near field coupling was intended to involve in the modified model to calculate the reflective return losses for particle-hybrid polymers. The calculated results demonstrate that the modified model is able to fit the experimental results more accurately.
The near field coupling is also considered in the case of frequency selective surface. The selective patterns can be represented by its effective resistance, inductance, and capacitance that are related to the thickness of the deposit and the geometric patterns of the lossy materials. Equivalent circuit method and coefficient theory were used to modify the FSS theory. The coupling equivalent circuit theory was established and solved for a specific case. The calculated results demonstrate that the modified theory is reasonable to meet some requirements.

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 v
圖目錄 viii
1. 緒論 1
1.1 前言 1
1.2 研究動機 1
1.3 研究目的 2
1.4 文獻回顧 3
1.5 章節概要 5
2. 微奈米吸波材料理論 7
2.1 奈米微粒的特性 7
2.2 奈米吸波材料之種類 8
2.2.1 電性材料之效應 9
2.2.2 磁性材料之效應 12
2.3 電磁波吸收原理簡介 13
2.3.1 均勻電磁波的反射與透射 14
2.3.2 穿透係數及反射係數之推導 15
2.3.3 推導反射損失 18
3. 電磁波吸收計算之方法 25
3.1 電磁波吸收計算基本理論介紹 25
3.1.1 基因演算法簡介 25
3.1.2 傳輸線演算法簡介 27
3.1.3 波動演算法簡介 28
3.1.4 追蹤演算法簡介 29
3.1.5 類比電路演算法簡介 30
3.2 利用類比電路法計算微奈米吸波材料 32
3.2.1 類比電路法之通式介紹 33
3.2.2 計算微奈米顆粒本身項之感應電抗及等效電納 36
3.2.3 計算微奈米顆粒耦合項之感應電抗及等效電納 38
3.2.3.1 電感耦合計算理論 39
3.2.3.2 計算微奈米顆粒耦合電容 41
4. 計算頻率選擇面 45
4.1 何謂頻率選擇面 45
4.2 頻率選擇面簡介與特性 45
4.2.1 蜂巢型頻率選擇表面 49
4.3 頻率選擇面的計算方法 50
4.3.1 矩量法簡介 50
4.3.2 有限差分法簡介 52
4.3.3 有限元素法簡介 54
4.3.4 模匹配法簡介 56
4.3.5 類比電路法簡介 56
4.4 利用類比電路法計算頻率選擇面之吸波材料 57
4.4.1 計算頻率選擇面本身項之感應電抗及等效電納 58
4.4.2 計算頻率選擇面耦合項之感應電抗及等效電納 61
4.4.2.1 頻率選擇表面電感耦合計算理論 62
4.4.2.2 頻率選擇表面電容耦合計算理論 65
5. 模擬計算結果與討論 69
5.1 模擬電磁波吸波效能 69
5.1.1 模擬介電材料吸波效能 69
5.1.2 模擬介電材料添加導磁材料吸波效能 72
5.2 類比電路法計算模擬電磁波吸波效能 74
5.2.1 利用類比電路法模擬介電材料吸波效能 74
5.2.2 利用類比電路法模擬介電材料添加導磁材料吸波效能 77
5.3 類比電路法計算模擬頻率選擇面之吸波材料 79
5.3.1 模擬計算蜂巢型頻率選擇表面 79
5.3.2 蜂巢型頻率選擇面尺度之變化 80
6. 未來展望84
參考文獻 85
自傳 89

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