臺灣博碩士論文加值系統

本篇論文是以平面式微帶線結構為研究基礎，分別進行雙頻與寬頻的微波帶通濾波器之電路設計。本文首先提出一種可達成雙頻帶的帶通濾波器架構，它是由兩個步階阻抗諧振腔所構成，且其諧振腔末端交互耦合。此濾波器的特點是傳輸零點直接出現在頻帶的兩旁以及截止頻帶上，因此能達成良好的濾波特性。另外，完整的電路設計流程與設計方程式皆詳細敘述在論文中。
接著本文提出一個寬頻帶的帶通濾波器架構，且此濾波器的特點是擁有抑制寬頻諧波的能力。不同於以往濾波器採用開路殘段達成諧波抑制的方法，本文提出一個步階式耦合線的結構；它的傳輸零點位置，可以直接藉由調控耦合線的耦合強弱，進而達成諧波的抑制。此方式與目前文獻已提出的諧波抑制方法相比，非但沒有增加電路設計的複雜度，亦不需額外串接諧波抑制的電路。藉由此方法，一個具有寬截止且寬頻帶的小型濾波器將可以被實現。
上述電路均使用全波電磁模擬軟體進行模擬工作，並實際進行電路製作與量
測。經由量測結果與電磁模擬相比較，確實驗證與理論有良好的一致性。

This study focuses on the design of a dual-band and a wide-passband bandpass filter, based on the planar microstrip structure. On the one hand, a new method for the dual-band filter is proposed. On the other hand, a wide-passband bandpass filter with a wide stopband is developed.
As for the dual-band filter, two stepped impedance resonators, whose two ends are mutually coupled, are utilized. Transmission zeros appear around the paasband skirts and within the rejection band. As a result, the achievement in filtering is quite notable. In addition, detailed design procedures and formula are provided as well.
As to develop the wide-passband bandpass filter, by adjusting the coupling between the stepped coupled line, transmission zeros can be easily tuned to result in a high level of harmonic suppression. Moreover, the design procedure for the wide-passband bandpass filter with a wide stopband is not complicated; besides, the circuit size is compact.
In terms of filter simulation, a full-wave electromagnetic simulator is employed for this thesis. Moreover, these circuits are fabricated and measured. Well matched results between the simulation and measurement show the validity of all proposed circuits.

第一章 簡介 1
1.1 研究動機 1
1.2 文獻探討 1
1.3 論文架構 2
第二章 濾波器設計理論 3
2.1 散射參數 3
2.2 二埠網路的奇偶模態電路分析 5
2.3 平行耦合微帶線之分析 6
2.4 步階阻抗諧振腔之分析 9
第三章 雙頻帶通濾波器設計 15
3.1 簡介 15
3.2 雙頻帶通濾波器分析 16
3.2.1 諧振腔分析 16
3.2.2 零點分析 18
3.2.3 頻帶調控 20
3.2.3.1頻帶位置的調控 20
3.2.3.2頻寬的調控 21
3.3 設計實例 22
3.3.1 規格 22
3.3.2 模擬與實做 22
第四章 寬頻帶通濾波器設計 31
4.1簡介 31
4.2 步階式耦合線分析 32
4.2.1 步階式耦合線Z矩陣分析 32
4.2.2 零點分析 36
4.3 步階式耦合線類型探討 37
4.3.1 均勻耦合線(uniform coupled line) 37
4.3.2 弱強弱步階式耦合線 39
4.3.3 強弱強步階式耦合線 41
4.4 步階式耦合在寬頻濾波器(Wide Bandpass Filter)上的應用 43
4.4.1 均勻耦合線寬頻濾波器 43
4.4.2 弱強弱步階式耦合線寬頻濾波器 45
4.5設計實例 49
4.5.1 等效電路模擬 49
4.5.2 電路架構 50
4.5.3 電磁模擬與實做量測 51
第五章 結論 53
參考文獻 55

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