臺灣博碩士論文加值系統

U型步階阻抗諧振器較傳統之半波長諧振器，具有低功率損失與可縮小電路尺寸之優點。此外，缺陷接地面結構除了能改善濾波特性，並且能進一步縮小電路之尺寸。於本論文中，我們利用U型步階阻抗諧振器與缺陷接地面結構來設計帶通濾波器。
於本論文中，首先探討缺陷接地面結構對平行耦合微帶線間的耦合量之影響，並且藉由分析缺陷接地面結構對頻率響應之影響，推導出缺陷接地面結構之等效電路。其次，分析具U型步階阻抗諧振器的帶通濾波器之設計理論，並分別設計與製作無或有缺陷接地面結構之帶通濾波器。最後，量測濾波器之特性，並將量測結果與模擬數值作比較。
由分析結果得知，兩種帶通濾波器皆具有極佳之濾波特性。此外，具U型步階阻抗諧振器之帶通濾波器比具U型等阻抗諧振器之帶通濾波器大約小 %之電路尺寸。另一方面，具缺陷接地面結構之帶通濾波器比無缺陷接地面結構之帶通濾波器大約小 %之電路尺寸。

The U-shaped stepped-impedance resonators have several advantages, such as low power loss and compact size, as compared with the conventional half-wavelength resonators. Furthermore, the defected ground structure not only can improve the performance of the filter, but also can furtherly reduce the size of the circuit. In this thesis, the U-shaped stepped-impedance resonators and the defected ground structures are used to design the bandpass filters.
In this thesis, the influence of defected ground structure on the coupling and frequency response of parallel-coupled microstrip lines are studied firstly, and then the equivalent circuit of defected ground structure is derived. Next, the theory of the design of bandpass filter using U-shaped stepped-impedance resonators is analyzed, and the bandpass filters without or with defected ground structures are designed and realized, respectively. Finally, the characteristics of these two filters are measured and compared with the simulation results.
From the analyzed results, it is found that both two bandpass filters have good performance. Furthermore, the size of the bandpass filter using U-shaped stepped-impedance resonators can be reduced about 28% as compared with the bandpass filter using U-shaped equal-impedance resonators. On the other hand, the size of the bandpass filter with defected ground structures can be reduced about 16% as compared with the bandpass filter without defected ground structures.

目 錄
第一章 緒論.............................................1
1-1 研究動機...........................................1
1-2 文獻探討...........................................2
1-3 內容概要...........................................3
第二章 具U型步階阻抗諧振器的帶通濾波器之理論分析........4
2-1 簡介...............................................4
2-2 準TEM傳輸線........................................5
2-3 集總式帶通濾波器...................................7
2-3.1 低通濾波器之設計...................................7
2-3.2 低通至帶通濾波器之轉換.............................9
2-4 分散式帶通濾波器..................................10
2-4.1 建立單一諧振器....................................11
2-4.2 內部耦合值與終端耦合值............................12
2-4.3 U型步階阻抗諧振器.................................13
2-5 具缺陷接地面結構之平行耦合微帶線..................14
2-5.1 缺陷接地面結構對耦合量之影響......................15
2-5.2 缺陷接地面結構對頻率響應之影響....................17
2-5.3 缺陷接地面結構之等效電路..........................18
第三章 具U型步階阻抗諧振器的帶通濾波器之設計...........38
3-1 簡介...............................................38
3-2 半波長諧振器.......................................38
3-3 帶通濾波器之設計...................................40
3-3.1 無缺陷接地面結構..................................40
3-3.2 具缺陷接地面結構..................................43
3-4 模擬特性...........................................44
3-4.1 無缺陷接地面結構..................................44
3-4.2 具缺陷接地面結構..................................45
第四章 具U型步階阻抗諧振器的帶通濾波器之製作與特性量測.57
4-1 簡介...............................................57
4-2 電路佈局與製作.....................................57
4-3 特性量測...........................................58
4-3.1 無缺陷接地面結構.................................58
4-3.2 具缺陷接地面結構.................................59
4-4 結果與討論.........................................59
第五章 結論............................................72
參考文獻.................................................74

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