在本論文中，首先會探討碎形結構對天線效能的影響，並從模擬的結果與理論的
分析得到碎形結構的階數越高，天線的阻抗頻寬就越宰的結論。 接著我們會將
碎形結構的概念應用在高溫共燒陶瓷(LTCC，Low Temperature Co-fired Ceramic)
天線的設計上，我們設計並實做出一個適用於IEEE 802.11a 無線網路規格的
LTCC 天線，並且將天線的模擬結果與量測的資料做分析與討論。最後，我們會
提出一個新的去交叉極化的方法，並將此方法運用在一階與二階Minkowski
curve 天線上，由實作與量測的結果驗證了此方法的可行性。此方法可以降低碎
形天線的交叉極化，讓碎形天線在通訊的應用上更為廣泛。

In this thesis, the relation between the fractal structure and the performance of the
antennna is discussed. From the simulation and theoretical analysis , we can
conclude that the 10dB impedance bandwidth of the monopole decreases when the
iteration level of the fractal structure increases . Then we use the fractal structure to
design the LTCC antenna. We design and manufacture an LTCC antenna for WLAN
IEEE 802.11a. The simulation and measured results are analyzed and discussed.
Finally, we provide a new method which can reduce the cross polariztion level. And
this method is used to reduce the cross polarization of the monopole using the second
iteration level of the Minkowski curve. It is shown that the method does work from
the measurement. This method can reduce the cross polarization of the fractal antenna
and hence find more application in communication systems.

致謝....................................................... I
中文摘要.................................................. III
英文摘要.................................................. IV
目錄...................................................... V
圖表目錄................................................. VII
第一章 序論 ................................................ 1
1.1 研究背景與動機...................................... 1
1.2 研究方法............................................ 1
1.3 論文大綱............................................ 2
第二章 碎形理論............................................ 3
2.1 碎形結構的介紹...................................... 3
2.2 碎形結構在天線上的應用.............................. 3
第三章 低溫共燒陶瓷之技術................................. 11
3.1 簡介............................................... 11
3.2 LTCC 的特色....................................... 11
3.3 LTCC 製造過程..................................... 14
第四章 碎形結構對天線效能的影響........................... 22
4.1 碎形結構Minkowski curve 碎形結構的介紹.............. 22
VI
4.2 碎形天線的模擬與探討............................... 23
4.3 理論觀點的探討..................................... 26
第五章 LTCC 天線的設計與實作............................. 28
5.1 LTCC 天線設計..................................... 28
5.2 LTCC 天線的量測與修正............................. 30
5.3 天線輻射場形的探討................................. 37
第六章 去交叉極化的方法................................... 44
6.1 引論............................................... 44
6.2 去交叉極化的方法................................... 44
6.3 實作與量測......................................... 47
第七章 結論............................................... 54
參考文獻.................................................. 55

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