臺灣博碩士論文加值系統

　　在本論文中探討(Mg0.95Co0.05)TiO3陶瓷系統的微波介電特性及材料的微結。藉著混合CaTiO3及Ca0.6La0.8/3TiO3陶瓷一起燒結，可以使系統的共振頻率溫度係數移至趨近零的結果。再者，以CuO添加可使燒結溫度降低，在燒結溫度1200℃持溫4小時，0.93(Mg0.95Co0.05)TiO3-0.07CaTiO3 +0.25wt% CuO的介電特性為：介電常數22.13、Q׃值129500(at 7GHz)及τƒ值為0.51ppm/℃。
　　在元件上的製作，利用FR4、Al2O3及自製的陶瓷基板設計一個三角形共振器耦合的濾波器，其中心頻率為5GHz，利用軟體的模擬並與實作的結果作特性上的比較。

The microwave dielectric properties and the microstructures of the series of (Mg0.95Co0.05)TiO3 ceramics system were investigated. With partial replacement of Mg by Co, dielectric properties of the (1-x)(Mg0.95Co0.05)TiO3-xCaTiO3 and (1-x)(Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3 ceramics can be promoted. The microwave dielectric properties have strongly correlated with the sintering temperature. By appropriately adjusting the x value in the series of (Mg0.95Co0.05)TiO3 ceramics system, zeroτƒ value can be achieved.
The CuO additives lowered the sintering temperature of 93MCCT ceramics to the range 1150℃~1225℃. With x=0.07, a dielectric constant of 22.13, a Q׃ value of 129500(at 7GHz) and a τƒ value of 0.51 ppm/℃ was obtained for 0.93(Mg0.95Co0.05)TiO3-0.07CaTiO3 +0.25wt%CuO ceramics sintered at 1200℃ for 4 h.
In the recent, miniature and low cost bandpass filters are very important in mobile communication systems. In this thesis,the characteristics of a bandpass filter with the designed center frequency of 5GHz were reported. The filter used in this work was composed of the triangular resonator. This approach has advantages for a low loss and the compact filter structure. Experimental results of the filters were reported in terms of insertion loss and return loss.

考試合格證明
中文摘要
英文摘要
誌謝
第一章 緒論………………………………………………1
第二章 原理………………………………………………3
2-1 介電理論…………………………………………… 3
2-2 介電共振器………………………………………… 8
2-3 燒結理論…………………………………………… 10
2-4 濾波器設計理論…………………………………… 11
2-4-1 微帶線基本概論………………………………… 11
2-4-2 實作線路尺寸計算方式………………………… 12
第三章 製程與量測方式…………………………………14
3-1 介電共振器………………………………………… 14
3-1-1 材料的製備……………………………………… 14
3-1-2 介電共振器的特性量測………………………… 15
3-2 濾波器……………………………………………… 18
3-2-1 製程……………………………………………… 18
3-2-2 量測……………………………………………… 20
第四章 實驗結果與討論…………………………………21
4-1 介電共振器之材料分析…………………………… 21
4-1-1 (1-x)(Mg0.95Co0.05)TiO3-xCaTiO3系統………21
4-1-2 添加CuO對(1-x)(Mg0.95Co0.05)TiO3-xCaTiO3系統的影響… 23
4-1-3 (1-x) (Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3系統……… 25
4-2 濾波器特性討論…………………………………… 26
第五章 結論………………………………………………28
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