Increasing manufacturing tolerance of microstrip filters using defected ground structure 蔡尹晟、吳俊德
E-mail: 321375@mail.dyu.edu.tw
ABSTRACT
This thesis uses defected ground structure (DGS) to change the characteristic impedance. In the design of a microwave filter, high impedance is always needed to generate the inductance. However, when the required impedance is very high, the width of
microstrip is very thin. By using DGS, we can use a wider line with DGS compared to the conventional microstrip line with integral ground. In order to calculate the characteristic impedance of a microstrip line with DGS, we calculate the input impedances of a specified length with an open and a short load. Then calculate the square root of the two results. The results are used to design microwave filters to demonstrate its applicability.
Keywords : DGS、microstrip lowpass filter、microstrip line
Table of Contents
封面內頁 簽名頁 博碩士論文電子檔案上網授權書．．．．．．．．．．．．．．iii 中文摘要．．．．．．．．．．．．
．．．．．．．．．．．．iv 英文摘要．．．．．．．．．．．．．．．．．．．．．．．．v 誌謝．．．．．．．．．
．．．．．．．．．．．．．．．．．vi 目錄．．．．．．．．．．．．．．．．．．．．．．．．．．vii 圖目錄．．．
．．．．．．．．．．．．．．．．．．．．．． ix 表目錄．．．．．．．．．．．．．．．．．．．．．．．．．xii 第一章 緒論．．．．．．．．．．．．．．．．．．．．．．．1 1.1研究動機與目的．．．．．．．．．．．．．．．．
．1 1.2研究方法．．．．．．．．．．．．．．．．．．．．2 1.3論文架構．．．．．．．．．．．．．．．．．．．
．3 第二章 Elliptic濾波器設計．．．．．．．．．．．．．．．．．5 2.1三階Elliptic濾波器設計．．．．．．．．．．．
．．5 2.2三階濾波器使用電路模擬軟體．．．．．．．．．．．9 2.3五階Elliptic濾波器設計．．．．．．．．．．．．
．10 2.4五階濾波器使用電路模擬軟體 ．．．．．．．．．．15 2.5三階、五階電磁模擬實作對照圖．．．．．．．．．17 第三章 利用開路(Open)與短路(Short)萃取開槽等效阻抗跟等效介 電常數(eff)探討．．．．．．．．．．．．．．．19 3.1利 用開路、短路萃取挖槽阻抗探討．．．．．．．．19 3.2 Open & Short circuit transmission line探討．．．．．．22 3.3等效 介電常數(eff)的探討．．．．．．．．．．．．．23 第四章 三、五階濾波器的挖槽設計．．．．．．．．．．．．30 4.1 三階Elliptic濾波器挖槽設計．．．．．．．．．．．30 4.2五階Elliptic濾波器挖槽設計．．．．．．．．．．．39 第五章 結論 ．．．．．．．．．．．．．．．．．．．．．．49 參考文獻．．．．．．．．．．．．．．．．．．．．．．．
．50
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