Study and Application ZnO-doped Nd(Co1/2Ti1/2)O3 Microwave of Dielectric Materials 黃森宏、許崇宜
E-mail: [email protected]
ABSTRACT
The dielectric properties and microstructures of Nd(Co1/2Ti1/2)O3 (NCT) ceramics with ZnO additions (0.5?2 wt?) prepared with a conventional solid-state route have been investigated. It is found that the sintering temperature for Nd(Co1/2Ti1/2)O3 ceramics can be reduced due to ZnO additions. At 1350oC, Nd(Co1/2Ti1/2)O3 ceramics with 0.5 wt% ZnO addition possess a dielectric constant (?r) of 27.4, a Q?f value of 147000 (9 GHz) and a temperature coefficient of resonant frequency (?f) of –30 ppm/oC.
Miniaturized microstrip line hairpin resonator with interdigital capacitor on the high permittivity ceramic substrates was
implemented. The full-wave simulator IE3D is used to design the two kinds of filter, one is two-pole electric coupling bandpass filter, and the other is four-pole cross coupling bandpass filter. The responses of filters which were designed at a frequency of 2.4GHz with using ZnO-doped NCT ceramic substrates are f0 = 2.36GHz、FBW = 4.6 %, S11 = -18.7 dB, S21 = -3.4 dB of four-pole
cross-coupled bandpass filter, and f0 = 2.43GHz、FBW = 7.5%, S11 = -31.63dB, S21 = -1.71dB of two-pole electric coupled bandpass filter.
Keywords : Nd(Co1/2Ti1/2)O3， bandpass filter
Table of Contents
目錄 封面內頁 簽名頁 授權書．．．．．．．．．．．．．．．．．．．． iii 中文摘要．．．．．．．．．．．．．．．
．．．． iv 英文摘要．．．．．．．．．．．．．．．．．．． v 誌謝．．．．．．．．．．．．．．．．．．．．． vi 目錄．．．．．．．．．．．．．．．．．．．．． vii 圖目錄．．．．．．．．．．．．．．．．．．．． x 表目錄．
．．．．．．．．．．．．．．．．．．． xiv 第一章 緒論 1-1 研究背景．．．．．．．．．．．．．．．．． 1 1-2 研 究動機．．．．．．．．．．．．．．．．． 2 第二章 微波介電材料原理 2-1介電原理 ．．．．．．．．．．．．．．
．．． 5 2-2微波介電特性．．．．．．．．．．．．．．． 7 2-2-1介電係數 ．．．．．．．．．．．．．．．． 7 2-2-2 品質因數 ．．．．．．．．．．．．．．．． 8 2-2-3共振頻率溫度飄移係數．．．．．．．．．． 10 2-3介電共振器原理
．．．．．．．．．．．．．． 12 2-4燒結理論．．．．．．．．．．．．．．．．．．14 2-4-1燒結的種類 ．．．．．
．．．．．．．．．． 14 2-4-2燒結體的構造與特性分析方式．．．．．．．．16 第三章 微波電路濾波器原理 3-1濾波 器的簡介與種類．．．．．．． ．．．．． 26 3-2微帶線的原理與各項參數公式．．．．．．．．．27 3-2-1 微帶線原理
．．．．．．．．．．．．．．． 27 3-2-2 微帶線準靜態分析．．．．．．．．．．．． 28 3-2-3 微帶線分析公式．．．
．．．．．．．．．． 28 3-2-4 集膚效應．．．．．．．．．．．．．．．． 30 3-2-5 微帶線的損失．．．．．．．．．
．．．．． 31 3-2-6 微帶線的不連續效應．．．．．．．．．．． 32 3-3耦合原理．．．．．．．．．．．．．．．．．
．33 3-3-1 共振器間偶合種類．．．．．．．．．．．． 33 3-3-2 耦合係數計算．．．．．．．．．．．．．． 34 3-4交 錯偶合濾波器．．．．．．．．．．．．．．．36 第四章 材料製程與電路設計 4-1微波介電材料的製作．．．．．．．
．．．．．．43 4-2微波介電材料的分析與量?方式．．．．．．．． 45 4-3濾波器的設計與量測．．．．．．．．．．．
．．48 4-3-1 共振器結構設計目標．．．．．．．．．．． 48 4-3-2 共振器的設計．．．．．．．．．．．．．． 49 4-3-3 交錯耦合帶通濾波器．．．．．．．．．．． 50 第五章 實驗結果量測與討論 5-1添加氧化鋅於NCT之微波介電材料分析
．．．．． 65 5-1-1 材料組成分析．．．．．．．．．．．．．． 65 5-1-2 物性分析．．．．．．．．．．．．．．．．
66 5-1-3 微波介電特性量測分析 ．．．．．．．．．．67 5-2 準橢圓帶通濾波器特性模擬與量測．．．．．． 69 5-2-1以 氧化鋁之基板製作帶通濾波器．．．．．．．69 5-2-2添加氧化鋅於NCT之基板製作帶通濾波器．．． 70 第六章 結論．
．．．．．．．．．．．．．．．． 85 參考文獻 ．．．．．．．．．．．．．．．．．． 88 REFERENCES
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