臺灣博碩士論文加值系統

本論文的內容是在平面雙模組帶通濾波器在基板兩側蝕刻不同大
小的方型槽孔，以改變濾波器的濾波性質，包括共振中心頻率、
插入損失、返回損失、半功率頻寬等。首先，在 為4.4的 FR4
接地基板上面，以兩條 50Ω傳輸線當成輸入和輸出端，互成90°
饋入結構的中心，模擬的頻率位於微波頻段，以 IE3D 模擬軟體
模擬濾波性質，並對其濾波性質進行分析比較。可得到方型槽孔
逐漸變大時共振中心頻率逐漸變小，插入損失，返回損失和半功
率頻寬也跟著改變的結論，而且加入槽孔除了產生降頻的效益其
位置也對濾波器的性質有所影響，符合本研究的目的。

Changing the position and size etched in the planar dual-mode band- pass filter can influent characteristics of filter included the resonant frequency﹑the insertion loss、the return loss and the 3dB bandwidth. The primary design process about this topic is demonstrated. The proposed bandpass filter are simulated on FR4 ( =4.4 ) substrate for microwave frequency by the IE3D microwave simulation
software. Each pattern is connected with two 50Ω microstrip line, one for input and the other for output. Two 50Ω microstrip line are connected to the central of the patch with two notches. We get some conclusion included that the larger slot causes the smaller resonant frequency and the insertion loss the return loss and the 3dB bandwidth varied with the size of slot. And also the resonant frequency﹑the insertion loss ﹑the return loss and the 3dB bandwidth are influenced by the position of slot. The successful filter research have been implemented and discussed in this dissertation.

文 字 目 錄
頁次
文字目錄 III
圖形目錄 V
表格目錄 VIII

第一章 緒論（Introduction） 1
1-1 概述 1
1-2 研究背景與動機 2
1-3 研究目的 3
1-4 內容提要 3
第二章 具有方形槽孔的平面雙模帶通濾波器之設計（Planar dual-mode bandpass filter with square slot in the ground plane） 10
2-1 設計概念 10
2-2 濾波器的設計 11
第三章 實驗結果與分析（Analysis of experimental results） 16
3-1 槽孔大小的影響 16
3-2 槽孔位置的影響 16
第四章 結論（Conclusion） 27
參考文獻 28
附錄 31

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