Accurate parameters extraction of defected ground structure and its applications for designing microstrip filters
郭記涵、吳俊德
E-mail: 321367@mail.dyu.edu.tw
ABSTRACT
This paper presents an accurate design technique for a low-pass filter with defected ground structure(DGS).We extract the defected ground structure (DGS) equivalent circuit component values for designing filter.The DGS not only can significantly increase the characteristic impendance of microstrip line,but also improve stopband performance by rejecting the higher order passband.For increasing efficiency and reducing the area of circuits, we usually utilize the defected ground structure, but the conventional design did not consider the parasitic effect of stub at high frequency﹒The parasitic effect may result in significant frequency deviation.In order to improve the accuracy of the low pass filter design with DGS, an equation to find the parasitic inductance is suggested.This inductance is used to modify the frequency deviation of low pass filter.
Keywords : defected ground structure、low pass filter、parasitic effect Table of Contents
封面內頁 簽名頁 博碩士論文暨電子檔案上網授權書...iii 中文摘要...iv ABSTRACT...v 誌
謝...vi 目錄...vii 圖目錄...ix 表目錄...xi 第一章 緒論...1 1.1 研 究動機與目的...1 1.2文獻探討...1 1.3 章節概述...2 第二章 濾波器原理...3 2.1 濾波器概 論...3 2.2 濾波器理論...5 2.2.1介入損耗函數法設計濾波器....5 2.2.2 極平坦響應函數...7 2.2.3 柴比雪夫響 應函數...9 2.3 濾波器設計...10 2.3.1 設計步驟...10 第三章 缺陷接地結構之參數萃取...17 3.1 缺陷型接 地架構概述...17 3.2 缺陷接地面結構(DGS)之分析....18 3.2.1 啞鈴型(DSS)缺陷接地之響應特性....18 3.2.2 啞鈴型缺陷接地 結構之電路分析...19 3.3 啞鈴型缺陷接地結構參數的萃取...24 3.3.1 DSS結構之電感方程式...24 3.3.2 挖槽之等效 元件特性與尺寸參數萃取...25 第四章 濾波器應用與寄生效應之修正法...27 4.1 加入啞鈴型缺陷接地結構設計之低通濾波 器...27 4.2 電路實現...30 4.2.1 短傳輸線近似等效電路...30 4.2.2 加入DSS缺陷接地結構之電路實 現...35 4.3 電路之寄生效應探討與修正...37 4.3.1 寄生電感值...37 4.3.2 鏡像原理...39 4.3.3 傳輸線寄生效應之修正...40 第五章 結論...47 參考文獻...48
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