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研究生：	張晟榜 Chang, Cheng-Peng
論文名稱：	利用開路殘段技術研製IEEE802.11a/b/g之雙工器 Fabrication of Diplexer for IEEE802.11a/b/g Using Open Stub Technique
指導教授：	李炳鈞 Li, Bing-Jing
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2005
畢業學年度：	93
語文別：	中文
論文頁數：	68
中文關鍵詞：	雙工器、開路殘段
外文關鍵詞：	diplexer, open stub
相關次數：	點閱：127 下載：1
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　　本論文使用四分之一波長開路殘段來抑制通帶外不必要的諧波，減少組成雙工器的濾波器間互相干擾的問題，並在通帶的邊緣產生一個零點，增加濾波器抑制通帶外訊號的能力，另外，使用直接饋入取代耦合饋入的方式，也同時改善了濾波器的截止率，使得通帶邊緣更陡峭，而因為傳統的四分之一波長開路殘段的零點抑制訊號的頻寬不足還有因為製成誤差造成零點的偏移，本論同時也介紹了摺疊式的開路殘段，其抑制訊號的插入損耗及頻帶寬度皆較傳統的四分之一波長開路殘段有所提升，對於雙工器的隔離度能也有效率的提升。根據上述，由兩個濾波器組合而成的雙工器其實作在符合IEEE 802.11 a/b/g頻帶的氧化鋁基板(Al2O3)上，其量測值和模擬值皆頗為相近。

　In this thesis, the designs of the diplexers conforming the standards of IEEE802.11a/b/g have been discussed. To design a diplexer, the filters corresponding each frequency channel are developed firstly and then combine using T-junction. Every filter is composed of half-wavelength type resonators and quarter-wavelength open stubs with tapped input and output section. The open stubs are successful to eliminate the unwanted out-of-band spurious passband and also improve the filter`s rejection rate. Finally, we replace the trafitional quarter-wavelength open stub with folded open stub because the inaccuracy of fabrication may cause the moveable transmission zeros shift and the quarter-wavelength open stub just can only match to a frequency point .So if filter`s bandwidth is large or fabrication is not accurate , the filter`s performance may be effected by the other. The behaviors of the presented circuits are all studied not only numerically using HFSS electromagnetic simulator, but also experimentally by circuit measurements. Good agreement has been obtained between simulations and experimental results.

第一章	緒論..............................................................1
	1-1. 前言.........................................................1
	1-2. 研究與動機...................................................1
	1-3. 論文架構.....................................................2
第二章   微帶線濾波器之理論與探討..........................................3
	2-1. 雙工器基本原理...............................................3
	2-2. 微帶線原理...................................................3
              2-2-1 微帶線傳輸組態.........................................4
              2-2-2 微帶線各項參數公式計算及考量...........................4
	2-3. 微帶線帶通濾波之理論........................................10
	     2-3-1 濾波器的規格及特性指標................................12
              2-3-2 微帶線諧振器種類......................................13
         2-4. 微小型的髮夾型共振器原理....................................14
              2-4-1 共振器結構............................................14
              2-4-2 共振情形..............................................15
         2-5. 四分之一波長的阻抗轉換器....................................18
            　2-5-1 四分之一波長開路殘段..................................19
            　2-5-2 摺疊式四分之一波長開路殘段............................19
         2-6. 文獻探討討..................................................21
第三章   雙工器的設計模擬與實作...........................................24
	3-1. 濾波器的設計................................................24
              3-1-1 基板材料..............................................25
              3-1-2 雙極點髮夾式濾波器設計................................26
         3-2. 隔離度......................................................27
         3-3. ADS模擬.....................................................29
              3-3-1 2.45GHz雙極點髮夾式濾波器.............................29
              3-3-2 5.3GHz雙極點髮夾式濾波器..............................30
              3-3-3 2.45/5.3GHz雙工器.....................................30
         3-4. HFSS模擬與實作量測..........................................33
              3-4-1 氧化鋁基板網印製作與量測方法..........................33
              3-4-2 2.45GHz雙極點髮夾式帶通濾波器.........................34
              3-4-3 5.3GHz雙極點髮夾式帶通濾波器..........................38
              3-4-4 雙工器A...............................................41
第四章   四分之一波長開路殘段之應用與變化.................................45
         4-1. 使用二階縮小型髮夾式濾波器之雙工器..........................45
              4-1-1 2.45GHz二階縮小型髮夾式帶通濾波器.....................46
              4-1-2 雙工器 B..............................................49
         4-2. 諧波的抑制及隔離度的改善....................................52
              4-2-1 2.45GHz二階縮小型髮夾式帶通濾波器(雙零點).............53
              4-2-2 5.3GHz二階髮夾式帶通濾波器............................57
              4-2-3 雙工器 C..............................................59
第五章   結論與未來展望...................................................65
參考文獻..................................................................67


                                    

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2006-08-03公開

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