臺灣博碩士論文加值系統

由於微波材料Ba2Ti9O20擁有高介電常數、低損耗與穩定的的共振頻率溫度係數，故非常適合作為微波材料之應用。然而Ba2Ti9O20的燒結溫度過高，因此無法應用於低溫燒結的製程，在本研究中利用低溫燒結促進劑的添加來降低Ba2Ti9O20的燒結溫度，並且探討此一材料的微波特性。
在微波電路中，λ/2結構之微波帶通濾波器會產生週期性的諧波，為了消除此一週期性的諧波，因此本篇論文中使用線寬擾動的結構抑制二次諧波。同時設計一個髮夾式帶通濾波器於Ba2Ti9O20陶瓷基板，製程係利用厚膜網印技術，此一微波帶通濾波器可以製作在兩公分見方的小面積中，帶通濾波器的中心頻率為0.9.GHz，中心頻寬比為5%。使用此結構確實能抑制二次諧波，且此濾波器實際量測的插入損S21為-2.43dB，反射損S11為-15.92dB。

By using high permittivity dielectrics, the bandpass filters can be miniaturized. A bandpass filter based on high permittivity dielectrics is proposed in this study. Ba2Ti9O20, with high dielectric constant, low loss and temperature stable is available for dielectric resonators and is adopted as a material in the fabrication of high permittivity ceramic substrates.However, the sintering temperature of Ba2Ti9O20 is higher than 1000℃, which limits its application in low-temperature cofired ceramics.In this study,low temperature sintering dopants were added to reduce the sintering temperature of Ba2Ti9O20.
Bandpass filters implemented with half-wavelength resonators have inherently harmonic frequencies at the multiples of frequency. A novel multistep transmission filter based on the strip-width modulation reformulation is proposed to suppress the spurious passband at the second harmonics of the operating frequency. A three-stage Chebyshev hairpin type bandpass filter was desined and implemented on Ba2Ti9O20 ceramic substrates. The center frequency of the designed bandpass filter is at 0.9 GHz and the fractional bandwidth is 5%. With the multistep structure, the spurious passband at the second harmonics is suppressed and the center frequency of the fabricated bandpass filter is at 0.88GHz and has the characteristics: the insertion loss S21= -2.4 dB, and the return loss S11= -15.71 dB.

中文摘要..........................................I
英文摘要.........................................II
誌謝............................................III
目錄.............................................IV
圖目錄.........................................VIII
表目錄..........................................XII
第一章 緒論.......................................1
1.1 研究目的與動機................................1
1.2 論文大綱......................................3
第二章 理論基礎...................................4
2.1 微波陶瓷材料簡介..............................4
2.2 微波介電理論..................................6
2.2.1 簡介........................................6
2.2.2 相對介電常數(Relative Permittivity, εr )....10
2.2.3 品質因子(Quality Factor，Q).................12
2.2.4 共振頻率溫度係數數(Temperature Coefficient of
Resonant Frequency, τf).....................15
2.3 微波介電陶瓷(Dielectric Creamics).............17
2.3.1 簡介........................................17
2.3.2 介電共振器(DR)..............................17
2.4 傳輸線理論....................................20
2.4.1 傳輸線的電路模型及參數......................20
2.4.2 傳輸線上的電波傳播..........................22
2.4.3 無損傳輸線..................................23
2.4.4 有載的無損傳輸線............................24
2.5 微帶線原理....................................27
2.5.1 微帶傳輸線介紹..............................27
2.5.2 微帶線傳輸型態..............................28
2.5.3 集膚效應....................................31
2.6 微波濾波器的設計原理..........................31
2.6.1 微波濾波器簡介..............................31
2.6.2 濾波器之規格 (Specification) ...............32
第三章 微波介電材料Ba2Ti9O20之製程與特性.........35
3.1 微波介電材料Ba2Ti9O20簡介.....................35
3.2 固態反應法(Solid State Reaction)..............37
3.3 前置藥品......................................38
3.4 實驗流程......................................39
3.4.1 Ba2Ti9O20純相固態反應法之製程...............39
3.4.2 Ba2Ti9O20添加V2O5固態反應法之製程...........41
3.4.3 Ba2Ti9O20陶瓷基板之製程.....................43
3.5 Ba2Ti9O20實驗儀器操作條件.....................45
3.5.1 阿基米德密度量測法..........................45
3.5.2 XRD繞射分析儀...............................45
3.5.3 SEM掃描式電子顯微鏡.........................45
3.5.4 微波介電特性量測............................46
3.6 量測結果與討論................................52
3.6.1 密度量測結果................................52
3.6.2 XRD量測結果.................................56
3.6.3 SEM量測結果.................................61
3.6.4 微波特性量測結果............................65
第四章 步階阻抗共振器理論與結構...................68
4.1 基本濾波器簡介................................68
4.2 步階阻抗共振器介紹(stepped impedance resonator)
SIR...........................................69
4.3 步階阻抗共振器實例............................72
4.3.1 髮夾式帶通濾波器之設計步驟說明..............72
4.3.2 利用SIR設計髮夾式帶通濾波器.................74
4.4 進階步階阻抗共振器型態........................79
4.4.1 單臂步階阻抗共振器..........................79
4.4.2 多重步階阻抗共振器..........................80
第五章 多重步階濾波器設計實例.....................81
5.1 多重步階帶通濾波器設計流程簡介................81
5.2 應用於FR4基板與Al2O3基板之微波帶通濾波器......84
5.2.1 電磁模擬....................................84
5.2.2 實作與量測..................................90
5.3 應用於Ba2Ti9O20基板平面式之微波帶通濾波.......93
5.3.1電磁模擬.....................................93
5.3.2實作與量測...................................96
第六章 結論.......................................99
參考文獻..........................................101

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