臺灣博碩士論文加值系統

由於第4代行動無線寬頻通訊傳輸技術的蓬勃發展，射頻濾波器被廣泛的使用在手機中使得需求量大增，其中階梯結構表面聲波濾波器因具有低插入損失、寬頻寬、低形狀因子、可承受功率大等幾項優越特性，為射頻聲波濾波器的常用架構之一，而單埠表面聲波共振器為其單位元件。本論文針對單埠表面聲波共振器之幾何參數，包含有IDT靜態電容(IDT對數和重疊長度)、電極厚度、IDT金屬比以及反射器根數對共振器之頻寬比、品質因子以及假模效應等特性影響進行有系統的探討，並尋找出設計一階階梯結構表面聲波濾波器建議流程，進而印證至階梯結構表面聲波濾波器之設計與特性分析，並以4G-LTE Band 7，與雙定位系統(GPS/GLONASS)作為設計與模擬規格印證。

As the growth of the 4th generation of mobile wireless broadband communication transmission technology (4G, LTE), RF surface acoustic wave filters are widely used in mobile phones for its excellent performance. Ladder type surface acoustic wave filter, which has the merits of low insertion loss, wide bandwidth, excellent shape factor and etc., is one of the most common architectures of RF SAW filters adopted in mobile phone systems. Since the unit element of a ladder type RF SAW filter is one port SAW resonators, the characteristics of one port resonators would determine the performance of a ladder type filter. In this work, the effect of the geometric parameters of the resonator, which includes IDT static capacitance (IDT logarithm and overlap length), electrode thickness, IDT metal ratio and number of the reflectors, on the characteristics of the one-port resonators, such as bandwidth ratio, quality factor and pseudo mode, were studied in detail. By applying the study results, a design procedure for an one-stage ladder-type SAW filter was proposed. Finally, a ladder-type filter were designed, step by step following the proposed procedure to evaluate the design procedure.

中文摘要 I
英文摘要 II
致謝 III
圖目錄 VI
表目錄 VIII
第一章 緒論 1
1-1研究背景與研究動機 1
1-2 論文內容及其架構 3
第二章 壓電材料與壓電特性 4
2-1壓電特性 4
2-1-1 正壓電效應 4
2-1-2 逆壓電效應 5
2-2 壓電材料 5
第三章 單埠表面聲波共振器特性分析 8
3-1 單埠表面聲波共振器幾何結構 8
3-1-1指叉換能器(IDT)基本結構及其等效電路 8
3-1-1-1 指叉換能器(IDT)基本結構 8
3-1-1-2 等效電路模型 10
3-2 單埠表面聲波共振器之特性分析 13
3-2-1單埠表面聲波共振器之RLC等效電路工作原理 13
3-2-2 IDT對數與重疊長度對共振器特性之影響 15
3-2-3電極厚度對共振器特性之影響 17
3-2-4 IDT金屬比對共振器特性之影響 20
3-2-5 反射器根數對共振器特性之影響 23
第四章 單埠表面聲波共振器特對階梯結構表面聲波濾波器特性之影 25
4-1 階梯結構表面聲波濾波器階梯結構與工作原理 25
4-2 將單埠共振器應用至階梯結構表面聲波濾波器之設計 28
4-2-1設計步驟 28
4-2-2 共振器特性對階梯結構濾波器之影響 29
4-2-2-1共振器對數與重疊長度對濾波器傳輸特性之影響 29
4-2-2-2指叉換能器(IDT)電極厚度對濾波器傳輸特性之影響 30
4-2-2-3共振器金屬比對濾波器傳輸特性之影響 31
4-3 設計範例 35
第五章 結論與未來方向 42
5-1結論 42
5-2 未來方向 43
參考文獻 44

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