臺灣博碩士論文加值系統

本文設計一種雙頻段分枝線耦合器(Dual band branch line coupler)，主要是利用相同的四分之一波長(λ)的非對稱馬蹄線(Asymmetric Spur Lines)與等效電路進行等效，非對稱馬蹄線(Asymmetric Spur Lines)架構是使用非對稱耦合線(Asymmetric coupled lines)去改良而成，等效電路是由一段傳輸線並聯一段開路殘段(Open-circuit stub)組成，依據理論推導計算，並利用模擬，可得出實際的尺寸，而在非對稱馬蹄線適當的條件下可推導出對稱馬蹄線(symmetric Spur Lines)電路與傳輸線電路的阻抗關係，利用以上方法，成功實現雙頻段等目的。
本文在雙頻段電路上，選擇較為常用的頻率規格，非對稱馬蹄線耦合器主要以雙頻段電路做區分，在第一個電路上，頻段為f2/f1=2GHz/0.9GHz，在低頻量測結果為S11=-19.134dB、S21=-3.745dB、S31=-20.051dB、S41=-3.764dB，相位差∠S21-∠S41為94.781°，其頻寬為60MHz，在高頻量測結果為S11=-19.379 dB、S21=-4.557dB、S31=-16.998dB、S41=-4.507dB，相位差∠S21-∠S41為85.752°，其頻寬為63MHz，達到與雙頻段分枝線耦合器一樣的效果，在第二個電路上，頻段為f2/f1=2.4GHz/1.8GHz，在低頻量測結果為S11=-22.638dB、S21=-3.778dB、S31=-17.675dB、S41=-3.7834dB，相位差∠S21-∠S41為87.071°，其頻寬為190MHz，在高頻量測結果為S11=-15.409dB、S21=-4.88dB、S31=-15.01 dB、S41=-4.9dB，相位差∠S21-∠S41為84.248°，其頻寬為60MHz，不僅達到與雙頻段分枝線耦合器效果一樣，並縮小高頻與低頻兩者的比值，使高低頻率更加靠近，改善電路兩頻率太相近，造成開路端傳輸線阻抗過高的問題，若更進一步研究，未來可達到低成本，容易製作等條件。

This paper presents the design of dual band branch-line couplers. In the proposed design, all asymmetric spur lines and conventional branch lines are only a quarter-wavelength long(λ).Both of them equal to each other.Asymmetric spur lines structure used asymmetric coupled lines to improve and conventional circuit consisted of a branch line merging parallel open stub. In theory, it can be acquire actual size from simulation. However, symmetric spur lines were derived by asymmetric spur lines in appropriate condition. To support implement circuit from impedance relationship between the two. According to the proposed design methods, realizing the purpose of dual-band, etc.
In this paper, select the common frequency specifications on dual band branch-line circuit. Asymmetric spur branch-line coupler divided into dual band frequency. The first circuit operating at f2/f1=2GHz/0.9GHz, the result of the measurement in lower band is S11=-19.134dB、S21=-3.745dB、S31=-20.051dB、S41=-3.764dB,the phase difference of∠S21-∠S41=94.781°, bandwidth of 60MHz, in upper band is S11=-19.379 dB、S21=-4.557dB、S31=-16.998dB、S41=-4.507dB﹐the phase difference of ∠S21-∠S41=85.752°﹐bandwidth of 63MHz, asymmetric spur branch-line coupler as practical as conventional. The second circuit operating at f2/f1=2.4GHz/1.8GHz, the result of the measurement in lower band is S11=-22.638dB、S21=-3.778dB、S31=-17.675dB、S41=-3.7834dB, the phase difference of∠S21-∠S41=87.071°, bandwidth of 190MHz, in upper band is S11=-15.409dB、S21=-4.88dB、S31=-15.01 dB、S41=-4.9dB, the phase difference of∠S21-∠S41=84.248°,bandwidth of 60MHz. The second circuit as practical as conventional and to reduce the ratio of both upper and lower band. The spur lines improved conventional circuit that two frequency too close, causing the Open-circuit stub impedance is too large. And it can further study to pursuit low cost, easy fabrication in the future.

摘要I
Abstract III
誌謝V
目錄VI
表目錄VIII
圖目錄X
第一章 緒論1
1.1 前言1
1.2 文獻探討2
1.3 研究動機與設計3
1.4 論文架構4
第二章 非對稱馬蹄線耦合器原理5
2.1 非對稱馬蹄耦合線傳輸矩陣(ABCD)推導6
2.2 等效電路與非對稱馬蹄耦合線傳輸矩陣分析16
2.2.1 馬蹄線等效傳輸線並聯開路殘斷18
2.2.2並聯開路殘斷的傳輸線等效為馬蹄線20
2.3 等效電路與對稱馬蹄耦合線傳輸矩陣分析22
2.4 雙頻段分枝線耦合器原理25
2.4.1 雙頻段分枝線耦合器架構26
2.4.2 雙頻段分枝線耦合器設計目標27
第三章 非對稱馬蹄線耦合器設計與模擬28
3.1 雙頻段分枝線耦合器設計與模擬(2/0.9GHz) 29
3.2 非對稱馬蹄線耦合器之等效電路設計與模擬32
3.2.1 單段非對稱馬蹄線之等效電路設計與模擬(2/0.9GHz) 33
3.2.2 非對稱馬蹄線耦合器模擬與數據(2/0.9GHz) 46
3.3 雙頻段分枝線耦合器設計(2.4/1.8GHz) 50
3.3.1 單段非對稱馬蹄線之等效電路設計與模擬(2.4/1.8GHz) 51
3.3.2 非對稱馬蹄線耦合器模擬與數據(2.4/1.8GHz) 64
第四章 非對稱馬蹄線耦合器量測和文獻比較68
4.1 非對稱馬蹄線耦合器電路量測 (2/0.9GHz) 69
4.1.1 非對稱馬蹄線耦合器電路模擬與量測比較 (2/0.9GHz) 72
4.2 非對稱馬蹄線耦合器電路量測 (2.4/1.8GHz) 73
4.2.1 非對稱馬蹄線耦合器電路模擬與量測比較 (2.4/1.8GHz) 76
4.3 非對稱馬蹄線耦合器電路量測結論77
4.4 雙頻段電路文獻比較78
4.5 文獻雙頻段電路製程限制80
第五章 結論與未來展望81
5.1 結論81
5.2 未來展望81
參考文獻82

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