臺灣博碩士論文加值系統

　　本論文探討機械式梳型濾波器，利用八個諧振器來設計X-Band中心頻率在9.1 GHz，頻帶寬度為8.75 GHz-9.45 GHz、相對頻寬為7.69 %以及頻帶寬度為8.9635 GHz −9.2365 GHz內、相對頻寬為3 %以下的空腔型帶通濾波器。在同軸的饋入端加上一片彎曲平行於諧振器的銅片代替直接饋入的方式以激發模態，利用調整諧振器與螺絲的長度來調整電容值改變共振頻率點，已達到欲設計的X-Band範圍。
　　本篇論文也探討使用放射型共振腔波導設計八路功率分配器，用波導的方式來做分配器，有功耗損失小、散熱性高的優點，透過調整徑向結構的大小可以修改工作範圍頻寬；改變共振腔內的九個帽蓋之尺寸可調整反射損耗，本研究設計的頻寬於7.6 GHz-18.7 GHz之寬頻結構。

　Waveguide-based designs for comb-line filter and radial power divider are presented in this thesis. Using eight resonators to create two X-band of Cavity Band-pass Filter, one whose center frequency is 9.1 GHz, bandwidth is 8.75 to 9.45 GHz, and whose relative bandwidth is 7.69 %, and another one whose center frequency is 9.1 GHz, bandwidth is 8.9635 to 9.2365 GHz. Applied to the coaxial feed end by adding a piece of copper that is bent parallel to the resonator instead of direct feeding to excite the mode, using the adjustment resonator and the length of the screw to adjust the capacitance value changes the resonance frequency.
Using coaxial probes and radial waveguides to create an eight-way broadband radial waveguide spatial power divider/combiner. It has the advantages of low power loss and high heat dissipation. The operation frequency and bandwidth is determined by the probe dimensions and the electrical length between the waveguide short wall and the center of probe array. This structure can provide uniform illumination of the array, and can be designed for wide-band operation. The bandwidth is operation in 7.6 to 18.7 GHz.

目錄

摘要……………………………………………………………………………………………..i
英文摘要………………………………………………………………………………………ii
誌謝……………………………………………………………………………………………iv
目錄………………………………...………………………………………………………......v
圖目錄………………………..………………………………………………………………vii
表目錄………………………………………………………………………………………….x
第一章 緒論………………………………………………………………………………….1
1.1 研究背景………………………………………………………………………………..1
1.2 研究動機與方法……………………………………………………………………..…2
1.3 論文架構………………………………………………………………………………..3
第二章 濾波器理論分析………...…………………………………………………………..5
2.1簡介…………………………………………………………………………………...…5
2.2濾波器頻率響應類別………………………………………………………….……..…6
2.2.1選擇響應特性………………………………………………………………………..6
2.2.2濾波器階數選擇……………………………………………………………………..9
2.3耦合係數法(coupling coefficient method) ……………………………………………10
2.3.1 耦合係數法推導步驟……………………………………………………………...11
2.3.2 低通原型濾波器…………………………………………………………………...12
2.3.3 導入J型或K型轉換器…………………………………………………………...13
2.3.4 利用J型轉換器表示低通原型濾波器…………………………………………....14
2.3.5 低通原型濾波器轉換成帶通濾波器……………………………………………...14
2.3.6 利用電納斜率參數表示帶通濾波器……………………………………………...15
2.3.7 使用耦合係數表示帶通濾波器……………………………………………...........16
第三章　八階梳型帶通濾波器………………………………………………………….17
3.1 諧振器介紹……………………………………………………………………………17
3.1.1諧振器頻率調整……………………………………………………………………17
3.1.2內部耦合係數之求法………………………………………………………………18
3.1.3外部品質因數之求法………………………………………………………………19
3.2梳型帶通濾波器之設計流程………………………………………………………….22
3.3梳型帶通濾波器之設計與模擬結果………………………………………………….23
3.3.1相對頻寬7%之八階梳型帶通濾波器……………………………………………..23
3.3.2相對頻寬3%之八階梳型帶通濾波器……………………………………………..31
3.4梳型帶通濾波器之實作與量測……………………………………………………….34
第四章　共振腔及矩形波導理論分析……………………………………………………...39
　4.1 共振腔理論之分析…………………………………………………………………....39
4.2 矩形波導理論之分析……………………………………………………....................43
第五章 寬頻徑向波導分配器……………………………………………………...............47
5.1 常用之分配器介紹……………………………………………………........................47
5.2 徑向分配器之設計流程……………………………………………………................52
5.3 徑向分配器之設計與模擬結果……………………………………………………....54
5.4 徑向分配器之實作與量測……………………………………………………............68
第六章 結論………………………………………………………………………...............72
參考文獻……………………………………………………………………………...............73

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