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研究生:沈俊旭
研究生(外文):Jiunn-Shiun Shen
論文名稱:燒結促進劑對MCT微波介電特性之影響及其應用
論文名稱(外文):The Effect of Microwave Dielectric Properties and Application of The MCT Ceramics Added Sintering Aids
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:2002
畢業學年度:90
語文別:中文
論文頁數:93
中文關鍵詞:濾波器MgTiO3-CaTiO3系統介電陶瓷
外文關鍵詞:MgTiO3-CaTiO3 systemfiltersdielectric ceramics
相關次數:
  • 被引用被引用:4
  • 點閱點閱:275
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  • 下載下載:60
  • 收藏至我的研究室書目清單書目收藏:1
摘要
在本論文內將分別以CuO及V2O5的含量來研究其相的形成及其對95MCT陶瓷的微波介電特性的影響。
由於液相的影響,所以當加入CuO在0.95MgTiO3-0.05CaTiO3(往後簡稱95MCT)時,其燒結溫度可降至1275℃。加入CuO後之微波介電特性被發現與燒結溫度有相當大之關係。在1275℃燒結時,加入0.25wt%CuO之95MCT所得之介電特性為:介電常數(εr)為20、品質因數(Q * f)為51000(在7GHz)及溫度係數(τf)為-8.3ppm/℃。
當加入少量的V2O5時,95MCT的緻密溫度將由原來的1400℃降至1300℃。當加入V2O5的含量由0.25wt%增加到1wt%時,95MCT陶瓷材料的介電常數(K)由18.9上升到19.6,而其溫度的飄移係數(τf)由-10.65ppm/℃往負成長至-21.32ppm/℃。加入了V2O5的95MCT材料的品質因數在一開始加入V2O5時,會先呈現上升的趨勢,當達到一個最大的飽和值(0.25wt%)後,及呈現下降之趨勢,且下降的程度隨著V2O5的含量增加而更行加大。95MCT加入0.25wt%之V2O5且於1300℃做燒結時,其介電特性為:K=18.9、Q*f=69000(7GHz)、τf=-10.65ppm/℃。若我們適當的調整(1-X)MgTiO3-XCaTiO3的X值,我們將可得到趨近於0的溫度的飄移係數(τf)。
近幾年來,小型化及低成本的帶通濾波器在行動通訊系統中已佔有重要地位。當以高介電常數的基板來實現小型化時,平面型濾波器結構是值得採用的一種。在本論文中,我們使用小型化之U型微帶線,以直接耦合的方式製作帶通濾波器。在濾波器基板製作方面,我們使用FR4、Al2O3及94MCT加入0.25wt%V2O5作為濾波器的基板,94MCT加入0.25wt%V2O5具有良好的溫度穩定性、高Q值及高εr的特點,因此可以有效地縮小濾波器體積並且得到不錯的頻率響應。
Abstract
The effects of CuO on the phase formation and the microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 ceramics were investigated as a function of the amount of CuO . The sintering temperature of CuO-doped 0.95MgTiO3–0.05CaTiO3 ceramics can be lowered to 1275 due to the liquid phase effect. The microwave dielectric properties are found strongly correlate with the sintering temperature as well as the amount of CuO addition. At 1275 , 0.95MgTiO3-0.05CaTiO3 ceramics with 0.25 wt% CuO addition possesses a dielectric constant of 20, a Q f value of 51000 ( at 7 GHz ) and a value of -8.3 ppm/ .
The effects of V2O5 on the phase formation and the microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 ceramics were investigated as a function of the amount of V2O5.With small amount of V2O5 addition, the densification temperatures of 0.95MgTiO3–0.05CaTiO3 ceramics decreased from 1400℃ to 1300℃. For densified 95MCT ceramics, as the amount of V2O5 increased from 0.25 to 1wt%, the dielectric constants increased from 18.9 to 19.6 and the temperature coefficients ( ) decreased from -10.65 to -21.32 ppm/℃. The quality values (Q f) of V2O5-doped 95MCT ceramics first increased, reached a maximum at 0.25 wt% V2O5, and then decreased with the further increase amount of V2O5 addition. At 1300℃, 0.95MgTiO3-0.05CaTiO3 ceramics with 0.25wt% V2O5 addition gives a dielectric constantεr of 18.9, a Q f value of 69000 ( 7 GHz ) and a value of -10.65 ppm/ . By appropriately adjusting the x value in the (1-x)MgTiO3-xCaTiO3 ceramic system, zero value can be obtained.
In the recent, miniature and low cost bandpass filters are very important in mobile communication systems. The planar filter structure is one of the possible choices for its compactness when realized with a high dielectric constant substrate . In the paper, we used microstrip miniaturized hairpin resonators to fabricate microwave bandpass filter based on direct-coupled mechanism. In the aspect of the filter substrate manufacture, we used FR4 , Al2O3 and 94MCT + 0.25wt%V2O5 to be the substrates of the filter. 94MCT + 0.25wt%V2O5 have been used due to its good temperature stability, high Q value and high relative dielectric constant, respectively .So that the filter can be miniaturized and realized good frequency response.
第一章 緒論……………………………………………………...1
第二章 原理……………………………………………………...4
2-1 介電理論………………………………………………...4
2-2 介電共振器……………………………………………...9
2-3 燒結原理…………..………………………………....11
2-4 微帶線原理………………………….……………….13
2-4-1 微帶線阻抗…………………………….………13
2-4-2 集膚效應…………………………….………....14
2-4-3 微帶線衰減……………………………………15
2-4-4 微帶線的不連續性………………….………...15
第三章 濾波器之設計與模擬………………….………………19
3-1 簡介………………….…………………………………19
3-2 微帶線諧振器種類………………….…………………19
3-3 諧振器間耦合型態…………….………………………23
3-3-1 電場(電容)性耦合……………………………..23
3-3-2 磁場(電感)性耦合……………………………..24
3-3-3 對稱混合性耦合……………………………….25
3-3-4 反對稱混合性耦合…………………………….27
3-4 諧振器間耦合量量測…………………………………..28
3-5 輸入及輸出點之設計…………………………………..29
3-6 濾波器設計步驟………………………………………..30


第四章 實驗製程與量測結果………………………………….34
4-1 製作程序……………………………………………….34
4-2 量測方法與步驟……………………………………….36
4-3 量測結果與討論……………………………………….37
4-3-1分別添加CuO、V2O5對MgTiO3-CaTiO3的影響…….38
4-3-3 濾波器實驗結果與討論………………………45
第五章 結論…………………………………………………….49
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