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研究生:張仲閔
研究生(外文):Chung-MinChang
論文名稱:低損耗微波介電材料Li2(Co1-xAx)Ti3O8 (A = Mg, Zn; x = 0.02–0.80)及其在無線通訊元件之應用
論文名稱(外文):Low-Loss Microwave Dielectrics Using Li2(Co1-xAx)Ti3O8 (A = Mg, Zn; x = 0.02–0.80) and Their Applications for Wireless Communication Components
指導教授:黃正亮
指導教授(外文):Cheng-Liang Huang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
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:2012
畢業學年度:100
語文別:中文
論文頁數:138
中文關鍵詞:微波介電材料微帶線
外文關鍵詞:dielectric materialmicrostrip
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在此篇論文中主要分為兩大部分,第一部份將介紹低損耗的介電材料;第二部份則延續第一部份介紹此材料在被動元件之應用,包含探討於不同基板上元件特性及尺寸的改善。
首先介紹Li2(Co1-xAx)Ti3O8 (A = Mg, Zn; x = 0.02–0.8)陶瓷系統之微波介電特性。在本實驗中分別利用Mg及Zn對Li2CoTi3O8中的Co做取代並探討添加後對其介電特性與材料之微結構是否產生影響。由實驗結果可知Li2(Co0.94Zn0.06)Ti3O8擁有最佳的微波介電特性,在其燒結溫度達1230 °C時其介電係數為24.08,Q×f為121,000 GHz,且共振頻率之溫度飄移係數為 –6.3 ppm/°C; 當Mg取代量為0.05,在燒結溫度達1260 °C時其介電係數為25.61,Q×f為107,000 GHz,且共振頻率之溫度飄移係數為 –4.9 ppm/°C。
第二部份根據諧振器的耦合技術和結合方法,利用基本的電場耦合微帶線結構(調整為SIR結構)並結合SLR結構的諧振器及四分之一開路殘段諧振器,設計一雙頻(2.45/5.2 GHz)帶通濾波器。由於止帶中產生四個傳輸零點,可有效改善濾波器的頻率響應,因為主要目的是使此雙頻帶通濾波器操作在WLAN通訊系統中,因此中心頻率設定於2.45 GHz及5.2 GHz。最後,我們將此電路實作在FR4、Al2O3和Li2(Co0.94Zn0.06)Ti3O8基板上,並量測其頻率響應互相比較。由量測的結果可得知,利用高介電係數及低損耗的材料做為電路基板時,確實能有效提升效能和縮小面積。

There are two main subjects in this thesis. First, we will discuss the low loss dielectric material. And the second, there will be a discussion of passive components and improvement of circuit size in different substrates.
First, the microwave dielectric properties of Li2(Co1-xAx)Ti3O8 (A=Mg Zn; x = 0.02–0.8) ceramic system have been investigated. The experiment results show that Li2(Co0.94Zn0.06)Ti3O8 ceramics has the excellent dielectric properties. The dielectric constant of Li2(Co0.94Zn0.06)Ti3O8 is 24.08, Q×f is 121,000 GHz, and τƒ is –6.3 ppm/°C; The dielectric constant of Li2(Co0.95Mg0.05)Ti3O8 is 25.61, Q×f is 107,000 GHz, and τƒ is –4.9ppm/°C.
Second, according to the coupling technique and the combination method, the use of electrically coupled microstrip line structure (adjusted SIR structure) combined with an SLR-structure of the resonator and a quarter of open-stub resonator design a dual-band (2.45/5.2 GHz) band-pass filter with three transmission zeros generated in the stop-bands to modify the response of the filter. The dual-band bandpass filter had the central frequencies of 2.45 and 5.2 GHz and was suitable for the applications in the WLAN communication system.Finally, the pattern was printed on FR4, Al2O3 and Li2(Co0.94A0.06)Ti3O8 substrates. By measured their frequency responses, using the substrates of high dielectric constant and low loss, which can improve the performance and reduce filter’s size.

摘要 III
Abstract V
誌謝 VII
目錄 IX
表目錄 XII
圖目錄 XIII
第一章 緒論 1
1-1 前言 1
1-2 研究目的 1
第二章 介電材料原理 2
2-1 陶瓷材料之微波介電特性 2
2-1-1 介電係數(Dielectric constant:εr) 2
2-1-2 介電品質因數(Quality factor:Q×f): 6
2-1-3 共振頻率之溫度係數(τf): 8
2-2 介電共振器(Dielectric Resonator, DR)原理 9
2-3 立方晶系(Cubic) 13
2-4 材料的燒結 14
2-4-1 燒結的種類 14
2-4-2 材料燒結之擴散方式 16
2-4-3 材料燒結之過程 17
第三章 微帶線及濾波器原理 18
3-1 濾波器原理 18
3-1-1濾波器的簡介 18
3-1-2濾波器之通帶頻段及頻率響應 19
3-2 微帶線原理 23
3-2-1 微帶傳輸線的簡介 23
3-2-2 微帶線的傳輸模態 24
3-2-3 微帶線各項參數公式計算及考量 25
3-2-4 微帶線的不連續效應 28
3-2-5 微帶線的損失 36
3-3 微帶線諧振器種類 37
3-3-1 λ/4短路微帶線共振器 38
3-3-2 λ/2開路微帶線共振器 39
3-4 共振器間的耦合形式 41
3-4-1 電場耦合: 41
3-4-2 磁場耦合: 45
3-4-3 混和耦合: 49
3-5 SLR(Stub-Loaded Resonators) 52
3-6 步階阻抗諧振器 54
3-7 四分之ㄧ波長的阻抗轉換器與開路殘段 (open stub) 56
3-8 微帶線雙頻帶通濾波器 58
第四章 實驗程序與量測方法 63
4-1 微波介電材料的製備 63
4-1-1 粉末的製備與球磨 64
4-1-2 粉末的煆燒 64
4-1-3 加入黏劑、過篩 64
4-1-4 壓模成型、去黏劑及燒結 64
4-2 微波介電材料的量測與分析 66
4-2-1 密度測量 66
4-2-2 X-Ray分析 66
4-2-3 SEM分析 67
4-2-4 介電特性量測與分析 67
4-2-5 共振頻率溫度飄移係數之測量 74
4-3 濾波器的製作與量測 75
第五章 實驗結果與討論 78
5-1 Li2(Co1-xMgx)Ti3O8 (x = 0.02–0.80 )之微波介電特性 78
5-1-1 Li2(Co1-xMgx)Ti3O8之X-Ray分析結果 79
5-1-2 Li2(Co1-xMgx)Ti3O8之SEM分析結果 81
5-1-3 Li2(Co1-xMgx)Ti3O8之相對密度密度分析結果 93
5-1-4 Li2(Co1-xMgx)Ti3O8之 、Qf分析結果 95
5-1-5 Li2(Co1-xMgx)Ti3O8之τf分析結果 98
5-2 Li2(Co1-xZnx)Ti3O8 (x = 0.02–0.80)之微波介電特性 101
5-1-1 Li2(Co1-xZnx)Ti3O8之X-Ray分析結果 102
5-2-2 Li2(Co1-xZnx)Ti3O8之SEM分析結果 104
5-2-3 Li2(Co1-xZnx)Ti3O8之相對密度分析結果 116
5-2-4 Li2(Co1-xZnx)Ti3O8之 、Qf分析結果 118
5-2-5 Li2(Co1-xZnx)Ti3O8之τf分析結果 121
5-3 濾波器的模擬與實作 124
5-4-1 使用FR4(玻璃纖維基板)之模擬與實作結果 125
5-4-2 使用Al2O3之模擬與實作結果 128
5-4-3 使用自製基板Li2(Co0.94Zn0.06)Ti3O8之模擬與實作結果 131
第六章 結論 136
參考文獻 137


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