Mg0.95Co0.05TiO3介電陶瓷之微波特性改善
及其應用
林士弘* 黃正亮**
國立成功大學電機工程研究所

本論文將討論介電陶瓷材料Mg0.95Co0.05TiO3，藉由添加不同燒結促進劑ZnO、CuO，探討產生的液相對其微波特性的影響，實驗結果顯示，原始的Mg0.95Co0.05TiO3燒結溫度必須達到1450℃，此時可得介電特性εr~16.8，Q×f~230000(9GHz)，τf~-55(ppm/oC)。由於τf為負值，我們選擇添加 Ca0.6La0.266 TiO3 (+213(ppm/oC))以調整其τf。在1250℃燒結且添加1.0wt 0/0 ZnO 時，具有最佳的介電特性﹔εr~28，Q×f~50000(7GHz)，τf~14(ppm/oC)。因此改善了Mg0.95Co0.05TiO3介電陶瓷的微波特性。
另外試圖與Zn0.975Ca0.025TiO3 混相{ X Mg0.95Co0.05TiO3-(1-X) Zn0.975Ca0.025TiO3}
去探討接近於零的共振頻率溫度係數，結果顯現在X=0.7時，燒結溫度1200℃時，具有較佳的微波特性：介電常數為22.6，Q×f值約為57000，共振頻率溫度係數(τf)約為0(ppm/oC)左右。
最後，本論文以FR4、氧化鋁、自製基板，製作設計一個緊密寬結止帶的微帶步階阻抗髮夾式elliptic函數低通濾波器，3dB截止頻率定為1.8GHz，階數為三階。

*研究生
**指導教授

Improved Microwave Dielectric Properties and Applications of Mg0.95Co0.05TiO3 Ceramics
Shih-Hung Lin* Cheng-Liang Huang**
Department of Electrical Engineering
National Cheng Kung University, Taiwan, R.O.C.

Abstract
The microwave properties of Mg0.95Co0.05TiO3dielectric ceramic materials are discussed in this paper. By adding different sintering aids ZnO and CuO respectively, we study the existence effects of liquid phase for the microwave properties of Mg0.95Co0.05TiO3. The experiment results show that with 1wt% ZnO addition can efficiently reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr~28，Q×f~50000(GHz) and τf~14(ppm/oC). Concerning about the negative value of τf , we choose adding the Zn0.975Ca0.025TiO3 (+30(ppm/oC)) to adjust the value approaching to zero. At 1200 oC, 0.7Mg0.95Co0.05TiO3-0.3Zn0.975Ca0.025TiO3appears the best property: εr~22.6, Q×f~57000(7GHz) andτf~0(ppm/oC) . Hence, the microwave properties of dielectric ceramic materials is improved.. Hence, the microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials is improved.
In addition, we design and fabricate a third order compact elliptic function low-pass filters using microstrip stepped-impedance hairpin resonators with 1.8GHz 3dB cutoff frequency on FR4、Al2O3、 Mg0.95Co0.05TiO3 substrate.
*The Author
**The Advisor

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第五章
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4 Huang, Cheng-Liang , Pan, Chung-Long; Hsu, Jui-Feng Source: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, v 43, n 8 A, August, 2004, p 5384-5387
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