具二次諧波抑制之人工合成傳輸線及其六埠調變器之應用

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研究生：	賴季暉 Chi-hui Lai
論文名稱：	具二次諧波抑制之人工合成傳輸線及其六埠調變器之應用 A Study on a Artificial Transmission Line with Second Harmonic Suppression and its Application to Six-port Modulator
指導教授：	馬自莊 Tzyh-ghuang Ma
口試委員:	陳士元 Shih-yuan Chen 曾昭雄 Chao-hsiung Tseng 王蒼容 Chun-Long Wang 廖文照 Wen-jiao Liao
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	116
中文關鍵詞：	人工合成傳輸線、諧波抑制、六埠網路、反射型式調變器、誤差向量振幅
外文關鍵詞：	artificial transmission line, harmonic suppression, six-port junction, reflection type modulator, EVM
相關次數：	點閱：381 下載：6
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上一筆

本論文提出一款具有近似橢圓函數低通響應之新型人工合成傳輸線。此人工合成傳輸線乃利用準集總微帶元件及其不連續效應合成，藉以產生慢波特性，縮小電路尺寸。該結構可合成各種不同特徵阻抗與電氣長度之微帶傳輸線，並可有效地抑制二次諧波。本論文詳盡討論此人工合成傳輸線之設計理念、電路架構、等效集總電路模型、以及模擬與量測結果。
本論文將此新提出之人工合成傳輸線應用於微波元件之微小化設計，包括：威爾金森功率分歧器、直交分合波器、鼠競耦合器、以及六埠網路。該創新設計均可在保持原有傳輸線特性和元件效能之前提下，有效降低電路面積。其模擬與量測數據皆有良好之穩合。
此外，本論文亦利用六埠網路整合實現一款2.4 GHz頻段之反射型式調變器。該調變器乃利用不同的終端負載造成相位差，達成正交相移鍵調變。在電路設計中，吾人使用冷偏壓之場效電晶體作為開關，以實現六埠網路之開路或短路負載。實驗中，該調變器可將資料傳送速率提高至每秒8百萬位元，其均方根誤差向量振幅在4.2 % 附近。

A novel slow-wave artificial transmission line with approximate elliptic function lowpass response is proposed in this thesis. The proposed artificial transmission line is capable of synthesizing microstrip lines with a variety of characteristic impedances and electrical lengths. Additional harmonic suppression capability is introduced to the artificial lines as well. The design concept, circuit geometry, equivalent lumped model and the simulated and measured results are carefully investigated and discussed.
Miniaturized Wilkinson power divider, quadrature hybrid and rat-race coupler are developed by utilizing the proposed artificial transmission line. The components reveal significant size reduction percentages as compared with conventional designs. In addition, the quadrature hybrid also demonstrates excellent signal suppression ability at the second harmonic frequency. The circuit performances are tabulated and compared with the conventional ones.
By utilizing the newly developed miniaturized Wilkinson power divider and quadrature hybrid, three miniaturized six-port junctions with compact size and second harmonic suppression characteristic are designed. Meanwhile, a miniaturized reflection type modulator, composed of the developed six-port junction and the cold-mode field effect transistors (FETs), is also implemented in this thesis. The modulator is experimentally demonstrated with QPSK modulation of a data rate up to 8 Mbps. The measured root mean square (RMS) error vector magnitudes (EVMs) are ranged around 4.2 %.

摘要	I
Abstract	III
誌謝   V
Contents	IX
List of Figures	XIII
List of Tables	XIX
Chapter 1 Introduction	1
1 Motivation	1
2 Literature Survey	2
3 Contribution	4
4 Thesis Organization	5
Chapter 2 Novel Slow-wave Artificial Line with Approximate Elliptic Function Lowpass Response	7
1 Introduction	7
3 Lumped Equivalent Circuit Model	11
4 Simulation and Measurement	12
5 Discussion	15
6 Summary	16
Chapter 3 Miniaturized Divider and Couplers	31
1 Introduction	31
2 Miniaturized Wilkinson Power Divider	32
2.1 Fundamentals and Circuit Configuration	32
2.2 Simulation and measurement	34
3 Miniaturized Quadrature Hybrid	35
3.1 Fundamentals and Circuit Configuration	35
3.2 Simulation and Result	36
4 Miniaturized Rat-Race Coupler	37
4.1 Fundamentals and Circuit Configuration	37
4.2 Simulation and Result	39
5 Discussion	40
6 Summary	40
Chapter 4 Miniaturized Six-port Junctions and their Applications	61
1 Introduction	61
2 Design Concept and Circuit Configuration	61
3 Simulation and Measurement	64
4 Miniaturized Reflection Type Modulator	66
4.1 Fundamentals of the QPSK Modulation	66
4.2 Fundamentals of the Reflection Type Modulator	67
4.3 Extraction of the Cold-mode FET	69
4.4 Experimental Results and Verification	70
5 Discussion	71
6 Summary	72
Chapter 5 Conclusion	103
1 Summary	103
2 Future Work	104
References	105
作者簡介          111
Appendix A        113

                                

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