| 研究生: |
林鈴梅 Lin, Ling-Mei |
|---|---|
| 論文名稱: |
燒結促進劑對Mg0.95Co0.05TiO3介電陶瓷之微波特性改善及其應用 Improved and Applications of Mg0.95Co0.05TiO3 Dielectric Ceramics with Sintering Aids |
| 指導教授: |
黃正亮
Huang, Cheng-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 88 |
| 中文關鍵詞: | 帶通濾波器 、介電材料 |
| 外文關鍵詞: | Dielectric Materials, filter |
| 相關次數: | 點閱:67 下載:3 |
| 分享至: |
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本論文文將討論介電陶瓷材料Mg0.95Co0.05TiO3 ,實驗結果顯示,原始的Mg0.95Co0.05TiO3 燒結溫度必須達到1450 ℃,可得介電特性εr ~16.8,Q*f~230000 (9GHz) ,τf ~-55 (ppm/oC)。
由於τf為負值,藉由分別以Ca0.6La0.80/3TiO3 (+213(ppm/oC))與Ca0.61Nd0.78/3TiO3 (+247(ppm/oC))混相以調整其τf 。添加不同燒結促進劑B2O3 、V2O5 與CuO ,探討產生的液相對其微波特性的影響。
在1250℃燒結且添加0.50 wt% B2O3 於0.9 Mg0.95Co0.05TiO3 -0.1Ca0.6La0.80/3TiO3時,具有最佳的介電特性﹔εr ~22.56, Q*f ~76000 (9GHz),τf ~10.7 (ppm/oC)。
在1250℃燒結且添加0.25 wt% CuO 於0.9 Mg0.95Co0.05TiO3 -0.1Ca0.61Nd0.78/3TiO3時,具有最佳的介電特性﹔εr ~22.33, Q*f ~62000 (9GHz),τf ~-27.5(ppm/oC)。改善了Mg0.95Co0.05TiO3 介電陶瓷微波特性。
最後,本論文利用印刷電路板的方式製作一個高頻Chebyshev 帶通濾波器,操作頻段涵蓋2.0GHz,然而所使用之基板則分別使用了FR4 ,Al2O3 ,及摻雜了燒結促進劑V2O5 之MCT-CNT 三種材料由自製基版可以發現應用於同一電路上,可以有效縮小其電路面積,且有更有的濾波特性。
The microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials are discussed in this paper. By adding different sintering aids V2O5 、CuO and B2O3 respectively, we study the existence effects of liquid phase for the microwave properties of Mg0.95Co0.05TiO3.
The experiment results show that with 0.50 wt% B2O3 addition can efficiently reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr ~22.56, Q*f ~76000 (GHz) and τf ~10.7(ppm/oC). Concerning about the negative value of τf , we choose CuO adding the Ca0.61Nd0.78/3TiO3 (+247(ppm/oC)) reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr ~22.33, Q*f ~62000 (GHz) and τf ~-27.5 (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 second order compact microstrip bandpass filters with two transmission zeros in 2.0 GHz on FR4 、Al2O3 、Mg0.95Co0.05TiO3 substrate.
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