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系統識別號 U0026-2101201014323300
論文名稱(中文) Mg2TiO4陶瓷材料之微波介電特性改善與應用
論文名稱(英文) Improved Microwave Dielectric Properties and Applications of Mg2TiO4 Ceramic Material
校院名稱 成功大學
系所名稱(中) 電機工程學系碩博士班
系所名稱(英) Department of Electrical Engineering
學年度 98
學期 1
出版年 99
研究生(中文) 江長陽
研究生(英文) Chang-Yang Jiang
學號 V8697108
學位類別 碩士
語文別 中文
論文頁數 120頁
口試委員 指導教授-黃正亮
口試委員-李文熙
口試委員-施權峰
口試委員-魏炯權
中文關鍵字 陶瓷  濾波器 
英文關鍵字 ceramic  filter 
學科別分類
中文摘要 本文以Mg2TiO4為主體,探討Mg2TiO4、Mg2(Ti0.95Sn0.05)O4和(Mg0.95Zn0.05)2TiO4 三種介電材料之共振頻率溫度漂移係數改善方法。為了將其負的共振頻率溫度飄移係數調整至趨近於零,我們添加具正值共振頻率溫度飄移係數的鈣鈦礦材料Ca0.8Sr0.2TiO3(+991 ppm/°C)及Ca0.8Sm0.4/3TiO3(+400 ppm/°C)。經由實驗的結果,我們得知0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3有最佳的微波介電特性,其 約為19.92、Q×f約為127,000 GHz (at 9.5 GHz)及τf約為–0.8 ppm/°C。
接下來,我們設計和實作一操作在2.4 GHz的帶通濾波器,濾波器主要由兩個U型諧振器經由電場耦合的方式來組成,並利用零度饋入線在其通帶的左右兩側各產生一零點,最後再加入一開路殘段來抑制其倍頻響應。我們將設計好的電路實作在FR4、氧化鋁和0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3基板上,並量測其各自的頻率響應,經由量測的結果得知,印刷在0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3基板上的濾波器擁有最低的插入損耗以及最小的原件尺寸,由此可說明利用高介電係數及高品質因數的材料確實能達到降低損耗和縮小面積的需求。
英文摘要 The improvement of τf of Mg2TiO4, Mg2(Ti0.95Sn0.05)O4 and (Mg0.95Zn0.05)2TiO4 base on Mg2TiO4 structure have been investigated. In order to adjust their negative τf, Ca0.8Sr0.2TiO3 and Ca0.8Sm0.4/3TiO3 perovskite which have positive τf had been add. The experiment result showed that 0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3 have the best microwave dielectric properties, it’s ~ 19.92, Q×f ~ 127,000 GHz (measured at 9.5 GHz) and τf ~ –0.8 ppm/°C.
Then, we design and fabricate a microwave band-pass patch filter which resonant at 2.4 GHz. The filter was constructed by two U shape resonators using electric coupling. To product two transmission zeros upper and lower the resonant frequency, zero-degree feed tapping feed lines were be used. Finally, an open-stub was added to suppress the spurious response. The pattern was printed on FR4, Al2O3 and 0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3 substrates. By measured their frequency responses, filer fabricated on 0.85(Mg0.95Zn0.05)2TiO4–0.15Ca0.8Sm0.4/3TiO3 substrate have the lowest insertion loss and the minimum size, which point out that dielectric material with high dielectric constant and high quality factor can improve the loss and reduce filter’s size.
論文目次 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 3
2-1 材料的燒結 3
2-1-1 材料燒結之擴散方式 3
2-1-2 材料燒結之過程 4
2-1-3 固相燒結與液相燒結 4
2-2 微波介電材料之特性 6
2-2-1 介電係數(Dielectric constant:K、εr) 6
2-2-2 品質因數(Quality factor:Q) 9
2-2-3 共振頻率溫度飄移係數(Temperature coefficient of resonant frequency:τf) 11
2-3 介電共振器(Dielectric resonator:DR) 12
2-4 尖晶石結構 (Spinel) 16
2-5 鈣鈦礦結構(Perovskite) 19
第三章 微帶線及濾波器原理 21
3-1 濾波器原理 21
3-1-1濾波器的簡介 21
3-1-2濾波器之通帶頻段及頻率響應 22
3-2 微帶線原理 25
3-2-1 微帶傳輸線的簡介 25
3-2-2 微帶線的傳輸模態 25
3-2-3 微帶線各項參數公式計算及考量 26
3-2-4 微帶線的不連續效應 29
3-2-5 微帶線的損失 35
3-3 微帶線諧振器種類 36
3-3-1 λ/4短路微帶線共振器 37
3-3-2 λ/2開路微帶線共振器 38
3-4 共振器間的耦合形式 39
3-4-1 電場耦合: 40
3-4-2 磁場耦合: 43
3-4-3 混和耦合: 46
3-5 零度饋入(非對稱性饋入) 49
第四章 實驗程序與量測方法 52
4-1 微波介電材料的製備 52
4-1-1 粉末的製備與球磨 53
4-1-2 粉末的煆燒 53
4-1-3 粉末的混相調配 53
4-1-4 加入黏劑、過篩 54
4-1-5 壓模成型、去黏劑及燒結 54
4-2 微波介電材料的量測與分析 54
4-2-1 密度測量 54
4-2-2 X-Ray分析 55
4-2-3 SEM、EDS分析 55
4-2-4 介電特性量測與分析 55
4-2-5 共振頻率溫度飄移係數之測量 63
4-3 濾波器的製作與量測 63
第五章 實驗結果與討論 66
5-1 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之微波介電特性 66
5-1-1 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之τf分析結果 66
5-1-2 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之XRD分析結果 67
5-1-3 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之EDS、SEM分析結果 69
5-1-4 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之密度分析結果 77
5-1-5 (1–x)Mg2TiO4–xCa0.8Sr0.2TiO3之K、Q×f分析結果 78
5-2 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之微波介電特性 80
5-2-1 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之τf分析結果 80
5-2-2 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之XRD分析結果 81
5-2-3 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之EDS、SEM分析結果 83
5-2-4 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之密度分析結果 91
5-2-5 (1–x)Mg2(Ti0.95Sn0.05)O4–xCa0.8Sr0.2TiO3之K、Q×f分析結果 92
5-3 (1–x)(Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之微波介電特性 94
5-3-1 (1–x) (Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之τf分析結果 94
5-3-2 (1–x) (Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之XRD分析結果 95
5-3-3 (1–x)(Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之EDS、SEM分析結果 97
5-3-4 (1–x)(Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之密度分析結果 105
5-3-5 (1–x)(Mg0.95Zn0.05)2TiO4–xCa0.8Sm0.4/3TiO3之K、Q×f分析結果 105
5-4 濾波器的模擬與實作 107
5-4-1 使用FR4(玻璃纖維基板)之模擬與實作結果 108
5-4-2 使用Al2O3之模擬與實作結果 110
5-4-3 使用自製基板(0.85MZT–0.15CSmT)之模擬與實作結果 112
第六章 結論 116
參考文獻 118
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