臺灣博碩士論文加值系統

本論文將討論介電陶瓷材料Nd(Zn1/2Ti1/2)O3，添加不同燒結促進劑B2O3 、V2O5 與ZnO，探討燒結促進劑對Nd(Zn1/2Ti1/2)O3 其微波特性的影響及在高頻的應用。文獻顯示，原始的Nd(Zn1/2Ti1/2)O3 燒結溫度必須達到1330 ℃，此時可得介電特性εr~31.6， Q×f ~170000 (8.5GHz) ，τf ~-42 (ppm/oC)。由實驗結果發現，在1300℃燒結且添加0.70 wt% ZnO 於Nd(Zn1/2Ti1/2)O3 時，具有最佳的介電特性﹔εr ~32.26， Q×f ~128000 (7.7GHz)，τf ~45 (ppm/oC) 的最佳特性，確實有達到降低燒結溫度之效果。
最後，本論文利用印刷電路板的方式，製作一個具有可調式零點的高頻帶通濾波器，操作頻段涵蓋2.0 GHz，使用之基板則分別為FR4 ，Al2O3 ，及添加了燒結促進劑ZnO 之Nd(Zn1/2Ti1/2)O3 三種材料。比較使用不同基板的濾波器響應以及元件尺寸，可以發現應用於同一電路上，具有高介電常數(εr)的自製基板可以達到縮小電路面積的效果，且有更好的濾波特性。

The influence of sintering aids on dielectric properties of Nd(Zn1/2Ti1/2)O3 ceramic at microwave frequency would be discussed in this paper. We expected to decrease the
sintering temperature of Nd(Zn1/2Ti1/2)O3 by adding three kinds of different sintering aids : Fe2O3、ZnO and V2O5 respectively.
The experiment results showed that adding 0.75 wt% ZnO could not only achieve the goal of reducing sintering temperature but also reach to the best dielectric properties amount three kinds of sintering aids. Adding 0.75 wt% ZnO has high dielectric constant(εr) of 32.26，Q×f ~128000 (7.7GHz) and τf ~-45 (ppm/oC) while reducing the sintering temperature from 1330 oC to 1300 oC.
In the end, we designed and fabricated a microstrip band pass filters with one tunable transmission zero in upper band of mid-band frequency 2.0 GHz on FR4 、Al2O3 and
Nd(Zn1/2Ti1/2)O3 + 0.75 wt% ZnO substrates. We could find that with the higher dielectric constant(εr) and Q×f , our filter could diminish the scale of size and demonstrate better frequency response.

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 材料的微波特性.................................................................................................. 3
2-2 介電共振器理論.................................................................................................. 8
2-3 介電共振器.......................................................................................................... 9
2-4 鈣鈦礦之結構.......................................................................................................11
2-5 燒結理論及工藝................................................................................................ 12
2-5-1 燒結的種類.............................................................................................. 13
2-5-2 影響燒結的幾個因素.............................................................................. 15
2-5-3 液相燒結理論.......................................................................................... 15
第三章 微帶線與濾波器原理......................................................................................... 17
3-1 微帶線的原理.................................................................................................... 17
3-1-1 微帶線傳輸組態...................................................................................... 17
3-1-2 微帶線各項參數公式計算...................................................................... 18
3-1-3 微帶線各項考量.................................................................................... 21
3-2 濾波器簡介........................................................................................................ 25
3-3 微帶線諧振器種類............................................................................................ 26
3-3-1 四分之一波長短路微帶線諧振器.......................................................... 27
3-3-1 二分之一波長開路微帶線諧振器.......................................................... 28
3-4 共振器間的耦合形式........................................................................................ 29
V
3-4-1 電場耦合................................................................................................... 30
3-4-2 磁場耦合.................................................................................................. 33
3-4-3 混和耦合.................................................................................................. 36
3-5 四分之一波長的阻抗轉換器與開路殘段(open stub) .................................... 38
3-6 反對稱式饋入磁場耦合濾波器設計............................................................... 40
第四章 實驗程序............................................................................................................. 43
4-1 微波介電材料的製備與特性量測流程圖....................................................... 43
4-1-1 微波介電材料的製備步驟...................................................................... 43
4-2 微波介電材料的特性分析與量測................................................................... 46
4-2-1 X-Ray 分析（XRD） .............................................................................. 46
4-2-2 掃瞄式電子顯微鏡（SEM）分析......................................................... 46
4-2-3 密度之量測.............................................................................................. 46
4-2-4 微波特性的量測...................................................................................... 47
4-3 濾波器之製作與量測........................................................................................ 53
4-3-1 濾波器規格.............................................................................................. 53
4-3-2 濾波器實作.............................................................................................. 54
4-3-3 特性量測.................................................................................................. 54
第五章 實驗結果與討論................................................................................................... 56
5-1 Nd(Zn1/2Ti1/2)O3 之微波特性之探討.................................................................. 56
5-1-1 Nd(Zn1/2Ti1/2)O3 添加燒結促進劑Fe2O3 ............................................... 56
5-1-2 Nd(Zn1/2Ti1/2)O3 添加燒結促進劑V2O5................................................. 67
5-1-3 Nd(Zn1/2Ti1/2)O3 添加燒結促進劑 ZnO................................................ 76
5-2 濾波器的響應...................................................................................................... 84
5-2-1 FR4 基板................................................................................................... 84
5-2-2 Al2O3 基板................................................................................................. 86
VI
5-2-3 Nd(Zn1/2Ti1/2)O3 + 0.75 wt% ZnO 基板................................................. 88
5-2-4 不同基板的濾波器特性比較與誤差探討............................................... 91
第六章 結論....................................................................................................................... 94
參考文獻................................................................................................................................ i

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