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研究生:藍文鎮
研究生(外文):Wen-Chen Lan
論文名稱:新型微波耦合器應用在鏡像拒斥混波器及單旁波帶混波器之電路設計
論文名稱(外文):Novel Microwave Coupler Used In Designs Of Image Rejection Mixer and Single-Sideband Mixer Circuits
指導教授:江逸群江逸群引用關係
指導教授(外文):Yi-Chyun Chiang
學位類別:碩士
校院名稱:長庚大學
系所名稱:電子工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:93
中文關鍵詞:單旁波帶混波器雙頻帶耦合器集總元件耦合器鏡頻拒斥混波器
外文關鍵詞:single-sideband mixerdualband couplerlumped-element couplerimage rejection mixer
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一般的單旁波帶混波器,藉由使用各一個射頻與中頻耦合器或一個中頻耦合器與一個90度相移的本地振盪訊號所構成的兩個雙平衡式混波器,來達成旁波帶拒斥與本地振盪至射頻端的隔離度。
本論文主要提出一個新的單旁波帶混波器架構,採用次諧波混波器架構,而且使用一個雙頻帶耦合器分別設計於射頻與中頻兩個頻帶,以減少電路面積。本論文也提出使用集總元件與分佈式集總元件的兩種雙頻帶耦合器設計方法。新的單旁波帶混波器架構包含2個反並聯式二極體對。為了驗證所提的單旁波帶混波器設計方法,研製單旁波帶混波器於一般的PCB上。量測結果顯示轉換損耗約15dB,旁波帶抑制約26dB,載波抑制約30dB。
其二,提出一種新型耦合線耦合器,採用平行微帶耦合線,在其上覆蓋上浮接金屬板,用來增強耦合量。在此架構中,可以不需要鎊線及高解析度之製程,即可以達到3dB 之耦合量。而且此架構可以與微帶波導架構(microwave guiding structure)相容。為了驗證所提的耦合器設計方法,研製鏡頻拒斥混波器於PCB上,量測結果顯示轉換損耗約18dB,鏡頻拒斥值約20dB。
In the conventional designs of SSM, the side-band rejection and the LO-to-RF isolation have to be achieved by using two double-balance mixers in conjunction with either RF and IF couplers or an IF coupler and a quadrature-phase LO pumping signals.
This thesis presents a novel single sideband mixer (SSM) feature with subharmonic mixer and a dual-band quadrature coupler, which is designed to operated at RF and IF bands, respectively, is proposed for minimizing the size of circuit. Two design approaches of constructing the dual-band couplers with the lumped-element and distributed-lumped elements are proposed. This novel feature of SSM is consisted of two anti-parallel diode. For verification of the proposed SSM design method, two experimental circuits were designed and fabricated on the conventional PCB. The measured results are the conversion loss of 15 dB, sideband suppression of 26dB, and carrier suppression of 30dB.
Second, presents a new structure of tightly coupled directional coupler fabricated on PCB substrate. The proposed structure is realized by placing a floating metal plate overlaid on the parallel-coupled microstrip lines to enhance the coupling between two lines. Such a structure can realize a 3dB directional coupler without using wire-bonding and very high resolution fabrication processes. For verification of the proposed coupler design method , one experimental circuits were designed and fabricated on the conventional PCB. The measured results are the conversion loss of 18 dB, image rejection ratio of 20dB.
目 錄


指導教授推薦書………………………………………………………….i
口試委員會審定書………………………………………………………ii
授權書…………………………………………………………………...iii
中文摘要…………………………………………………………………v
英文摘要………………………………………………………………...vi
誌謝……………………………………………………………………viii
目錄……………………………………………………………………..ix圖表目錄………………………………………………………………..xii
第一章 簡介……………………………………………………………1
1.1研究動機………………………………………………………1
1.2章節概述………………………………………………………1
第二章 混波器基本原理……………………………………………3
2.1鏡頻拒斥與單旁波帶混波器基本原理及架構………………3
2.1.1鏡頻拒斥混波器基本動作原理…………………………4
2.1.2單旁波帶混波器基本動作原理…………………………6
2.2 反並聯式二極體工作原理……………………………………8
2.3混波器的主要特性…………………………………………9
第三章 集總元件式耦合器…………………………………………….12
3.1等效集總網路分析…………………………………………12
3.2寬頻二階集總元件式耦合器………………………………18
3.3雙頻帶二階集總元件式耦合器……………………………24
第四章 使用集總元件式雙頻帶耦合器設計單旁波帶混波器………38
4.1混波器架構的動作原理分析………………………………38
4.2集總元件式雙頻帶耦合器電路設計………………………39
4.3單旁波帶混波器……………………………………………45
4.3.1電路設計………………………………………………45
4.3.2特性量測與討論……………………………………46
第五章 使用集總元件與分佈式元件的雙頻帶耦合器設計單旁波
帶混波器………………………………………………………53
5.1使用分佈式元件與集總元件的雙頻帶耦合器電路設計…53
5.2功率分割器電路設計……....……………………………...60
5.3單旁波帶混頻器……………………………………………62
5.3.1電路設計………………………………………………62
5.3.2特性量測與討論………………………………………63
第六章 使用新型微帶線耦合器設計鏡頻拒斥混波器………………70
6.1混波器架構的選擇與動作原理分析………………………70
6.2集總元件式耦合器電路設計………………………………71
6.2.1中頻耦合器…………………………………………71
6.2.2射頻耦合器…………………………………………74
6.2.2.1新型耦合器奇偶模分析...........................................74
6.2.2.2射頻耦合器之製作...................................................78
6.3鏡頻拒斥混波器……………………………………………80
6.3.1電路設計………………………………………………80
6.3.2特性量測與討論……………………………………82
第七章 結論與建議…………………………………………………90
參考文獻………………………………………………………………91
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