臺灣博碩士論文加值系統

本論文主要分為兩個部份。第一部份是平面式微波雙頻帶通濾波器設計，此濾波器是採用耦合式饋入的平行耦合線與開路耦合線為電路架構。為了解決開路微帶耦合線的奇、偶模相速不相等問題，在開路微帶耦合線的兩端加入指叉式電容耦合，使其奇模的相速獲得補償。另外，在輸入與輸出埠之間加入電容性耦合，將使得通帶外傳輸零點往通帶移動而達成提高通帶的選擇性。最後將兩組設計在不同頻帶的濾波器疊接，即可達成雙頻帶的效果，而電路分析上是採用J反轉子。
第二部份提出平面式微波寬截止頻帶濾波器，架構上是結合短路傳輸線、傳輸線與開路耦合線。電路分析上同樣是採用J反轉子分析，並且適當地選擇短路傳輸線、傳輸線與開路耦合線的電氣長度來控制傳輸零點，以期達到寬截止帶的效果。最後以此寬截止頻帶濾波器為基礎又額外在饋入端使用馬蹄型線，如此將可達到諧波抑制的效果，並進而使濾波器擁有更大的截止頻寬。
上述電路均使用全波電磁模擬軟體進行模擬，實際製作電路並進行量測。經由電磁模擬與量測的結果相互比較，均具有良好的一致性。

There are two parts in this thesis. The first part is design of a planar microwave dual-band bandpass filter. The structure of this dual-band bandpass filter is composed of an open-end coupled line and two parallel coupled lines with coupling feeding. Because the unequal even-mode and odd-mode phase velocity of the open-end coupled line, the interdigital capacitors at two ends of open-end coupled line are utilized to compensate the odd-mode phase velocity. Moreover, the added capacitive coupling between the input and output ports can move two transmission zeros at the passband skirts more closely. Then, two of single passband filters with different central frequencies are cascoded to achieve a dual-passband bandpass filter, and the J-inverter has been used to analyze this filter.
In the second part, the planar microstrip bandpass filters with wide stopband are presented. The open-end coupled line, transmission line and short stub are the main structure of the wide stopband bandpass filter. By properly choosing electrical lengths of open-end coupled line, transmission line and short stub, the outband transmission zeros can be controlled to achieve a wide stopband. Moreover, the J-inverter can be used to analyze this filter. In addition, in order to increase the stopband bandwidth, two spur lines can be added into the input and output ports.
All filters in this thesis are simulated with full-wave electromagnetic simulator, and these filters have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits.

摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 VIII
第一章 緒論 1
1.1 研究動機 1
1.2 論文架構 2
第二章 濾波器設計理論 3
2.1 簡介 3
2.2 介入損耗法 3
2.2.1 巴特沃茲(Butterworth)濾波器 4
2.2.2 柴比雪夫(Chebyshev)濾波器 5
2.2.3 低通濾波器雛形 6
2.3 導納及阻抗反轉子(J- and K-inverters) 7
2.4 耦合線等效電路 13
2.5 測試夾具量測介紹 18
第三章 雙頻帶通濾波器設計 21
3.1 簡介 21
3.2 雙頻帶通濾波器之基本設計 22
3.2.1 濾波器之J反轉子合成與分析 23
3.2.2 傳輸零點產生機制 25
3.2.3 設計實例—兩組不同頻率之單頻帶通濾波器 25
3.2.4 埠間耦合的效應 32
3.3 設計實例－雙頻帶通濾波器最佳化佈局與實作 36
第四章 寬截止頻帶濾波器設計 41
4.1 簡介 41
4.2 寬截止頻帶濾波器之基本設計 42
4.2.1 濾波器之J反轉子合成與分析 43
4.2.2 傳輸零點產生機制 46
4.2.3 設計實例－寬截止頻帶濾波器設計 46
4.2.4 設計實例－寬截止頻帶濾波器最佳化佈局與實作 50
4.3 極寬截止頻帶濾波器設計 54
4.3.1 馬蹄型線之特性分析 54
4.3.2 設計實例－極寬截止頻帶濾波器最佳化佈局與實作 58
第五章 結論 63
參考文獻 65

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