臺灣博碩士論文加值系統

　　微波濾波器設計常由集成元件低通原型設計著手，利用轉換和近似技巧，逐步等效成分佈式元件電路，據此再進行佈局轉換及實作。由此設計過程中，最初濾波器的設計參數將劣化，尤其是濾波器頻寬(bandwidth)，為了加強對於頻寬的預測，文獻上有新的方法被提出以改善對頻寬的掌控度，並應用於寬頻平行耦合微帶線帶通濾波器設計。本篇論文中，仿效此設計方法設計兩個中心頻率為4GHz，50%頻寬規格的濾波器，一個用傳統方法決定耦合微帶線電氣參數，另一個用新方法來決定電氣參數，最後經電磁軟體模擬和實作量測驗證是有加強頻寬的預測。

　　Microwave filter design frequently uses a lumped-element lowpass prototype, and a series of skills of transformation and approximation are then applied to achieve a distributed circuit that is suitable for layout realization. During the design process, filter’s design specifications are degraded,especially filter bandwidth. In order to enhance the bandwidth forecast, new method was proposed in a literature to reduce the shrinkage of bandwidth, and it was applied for the design of wideband parallel-coupled microstrip bandpass filter. In this paper, the proposed method is used to design two versions of filter that centered at 4GHz and having 50% fractional bandwidth. The circuit parameters of one of the two designs are determined by classical method, and the other one is determined by the literature-proposed method. Layouts of both designed are examined by electromagnetic simulator, implemented and verified by measurements.

致謝...I

中文摘要...II

英文摘要...III

目錄...IV

圖目錄...V

表目錄...VII

第一章 簡介...1

1-1 論文架構...2

第二章 濾波器設計理論...3

2-1簡介...3

2-2集成式濾波器設計...3

2-3分散式濾波器設計...8

2-3-1 耦合線原理...8

2-3-2 阻抗導納轉換器...10

2-3-3 耦合線濾波器 ...12

2-4 小結...18

第三章 帶通濾波器設計、製作與量測成果...19

3-1 設計流程...19

3-2 濾波器合成...21

3-3 模擬...25

3-4 製作與量測...35

3-4-1 量測成果...37

第四章 結論...40

參考文獻...41

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