臺灣博碩士論文加值系統

本論文利用四分之波長阻抗轉換傳輸線理論和耦合線耦合器理論為基礎，設計出寬頻具阻抗轉換特性之耦合線耦合器。本論文之耦合線耦合器是利用微帶線及增強耦合結構之耦合線所組成之平面電路，故在電路的實作上是容易實現的。
為了證實本論文所提出之四分之波長耦合線耦合器具寬頻阻抗轉換之特性，本論文實作兩個增強耦合結構之耦合線耦合器，分別為三截式耦合線耦合器具阻抗轉換耦合器與兩截耦合線耦合器串接四分之波長阻抗轉換耦合線之耦合器，使用板材為介電常數3.55的Rogers RO4003，板材厚度為 20 mil，操作中心頻率為 1.5GHz，輸入阻抗50歐姆以及輸出阻抗20歐姆；另一方面，由於有一端的阻抗為20歐姆，故在量測時須克服輸出阻抗與夾具間不同而產生的反射、相移問題。

In this thesis, coupled-line coupler with impedance transforming characteristics is proposed using quarter-wavelength transformer and coupled-line coupler. It is a planar circuit consisted of microstrip lines and coupled line with enhanced coupling structures, which makes it simple to manufacture and reliable.
In order to generalize the concept with broadband impedance transforming characteristics, two coupled-line couplers with different constructure are designed and measured. The proposed coupled-line couplers, with center frequency 1.5GHz,input impedance 50 Ohm and output impedance 20 Ohm, are manufactured on a Rogers RO4003 substrate with dielectric constant of 3.55 and thickness of 20 mil. On the other hand, this thesis also emphasizes on overcoming the problem of measuring the circuit with input and fixture that cause the reflection and phase shift.

具阻抗轉換功能之耦合線耦合器 i
ABSTRACT ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
Chapter 1 緒論 1
1.1 研究動機 1
1.2 章節介紹 2
Chapter 2 理論 3
2.1 微帶線理論 3
2.2 耦合線理論 5
2.3 3dB耦合器 8
Chapter 3 設計與模擬 11
3.1 三截耦合線耦合器帶阻抗轉換之3db耦合器 15
3.1.1 第一截電路設計 20
3.1.2 第二截電路設計 22
3.1.3 第三截電路設計 24
3.1.4 三截串接電路設計 26
3.2 兩截耦合線耦合器帶阻抗轉換之3dB耦合器 29
3.2.1 第一截電路設計 30
3.2.2 第三截電路設計 32
3.2.3 兩截串接電路設計 34
3.3 帶緩變線之耦合器 37
3.3.1 帶緩線線三截耦合線耦合器阻抗轉換之耦合器 40
3.3.2 帶緩線線二截耦合線耦合器阻抗轉換之耦合器 43
Chapter 4 實作與量測 46
4.1 帶緩變線之量測方法 46
4.1.1 三截耦合線耦合器帶阻抗轉換之3db耦合器 47
4.1.2 兩截耦合線耦合器帶阻抗轉換之3db耦合器 51
4.2 用解遷入之量測方法 55
4.2.1 三截耦合線耦合器帶阻抗轉換之3db耦合器 58
4.2.2 兩截耦合線耦合器帶阻抗轉換之3db耦合器 62
Chapter 5 結論 65
參考文獻 66

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