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研究生:范介榮
研究生(外文):Chieh-jung Fan
論文名稱:指叉耦合帶通濾波器
論文名稱(外文):Interdigital-Coupled Bandpass Filters
指導教授:蔡友遜
指導教授(外文):Yu-Shun Tsai
口試委員:吳建銘陳振聲蔡友遜
口試委員(外文):Jian-Ming WuJin-Sen ChenYu-Shun Tsai
口試日期:2014-07-18
學位類別:碩士
校院名稱:正修科技大學
系所名稱:電子工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:36
中文關鍵詞:指叉耦合
外文關鍵詞:Interdigital-Coupled
相關次數:
  • 被引用被引用:0
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  • 下載下載:8
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摘要

本篇論文提出一種縮小化濾波器架構,使用指叉耦合(interdigital coupling),並於指叉背面加上短節(stub)的環型諧振器。藉由2種機制調整濾波器特性,一是增加指叉的數量,以調整諧振器耦合量,改善濾波特性;另一是在指叉背面加上折疊的步階式短節,可輕易地調整通帶兩旁零點的位置,進而改變濾波器的通帶寬度、通帶兩側裙邊斜率,使濾波器頻帶寬度符合通訊規範要求,並能有效抑制鄰近通訊頻率的干擾。利用環型諧振器內部空間,將諧振器之微帶線向內彎折,以增長諧振器電長度,可輕易地改變通帶中心頻率,並達到縮小化濾波器尺寸的效果。
濾波器架構具有倒置對稱的結構,使用50歐姆的SMA接頭將信號直接饋入環型諧振器。實驗使用FR4基板,介電係數為εr =4.7,厚度h=0.8mm。製作的濾波器頻帶範圍在1.71~1.75GHz,頻帶寬度50MHz,可應用W-CDMA band4 之行動通訊。

This paper presents a miniaturized design of microwave bandpass filter. Filter architecture adopts the open-looped ring resonator with interdigital coupling and with stubs on the back side of interdigital sections. With two kinds of mechanism to promote the filter characteristic, firstly, increase the interdigital number to improve the coupling character of ring resonators. The other is adding the step-impedance type of folded stubs to adjust the position of the transmission zeros which located on both sides of pass-band. It is useful for tuning filter feature to achieve a specified frequency bandwidth. Folding the ring resonator into its internal region for increasing resonant electrical length and decreasing resonant frequency, it can change the central frequency of filter pass-band easy and miniaturize the filter design.
The proposed filter has an inverted symmetrical structure. Using 50 ohms SMA connectors fed the excited signal directly into the ring resonator. Experimental filter sample was produced on FR4 substrate which dielectric coefficient εr = 4.7 and thickness h = 0.8mm. The designed filter operates at frequency range 1.71 ~ 1.75GHz and bandwidth being 50MHz. It can be applied to the W-CDMA band 4 of 4G LTE mobile communication systems.

中文摘要
英文摘要
文字目錄
圖形目錄
表格目錄
第 一 章 序論
1.1 前言
1.2 文獻探討
第 二 章 環形共振器
2.1 概述
2.2 環形共振器分析
2.2.1 散佈電路模型
2.2.2 電磁場分析
2.3 環形帶通濾波器
2.4 數據分析
2.5 結論
第 三 章 濾波器設計
3.1 簡介
3.2 電路設計
3.3 指叉間距模擬
3.4 短節位置模擬
3.5 結論
第 四 章 實作量測
4.1 結論
第 五 章 結論(Conclusions)
參考文獻(Reference)
圖形目錄
圖2.3(a) 平行耦合環型濾波器架構圖
圖2.3(b) 改良指叉耦合環型濾波器架構圖
圖2.4.1指叉耦合等效電路
圖2.4.2 平行耦合s11圖
圖2.4.3 平行耦合s21圖
圖2.4.4 指叉耦合s11圖
圖2.4.5 指叉耦合s21圖
圖3.3.1 指叉耦合結構圖
圖3.3.2 指叉間距s11比較圖
圖3.3.3 指叉間距s21比較圖
圖3.4.1 短節位置結構圖
圖3.4.2 短節位置s11比較圖
圖3.4.3 短節位置s21比較圖
圖3.4.4 短節位置結構圖(在指叉上)
圖3.4.5 短節位置s11比較圖
圖3.4.6 短節位置s21比較圖
圖3.4.7 短節擺放內部之結構圖
圖3.4.8 短節擺放內部之s11比較圖
圖3.4.9 平行耦合環型濾波器架構圖
圖3.4.10 短節擺放外部之結構圖
圖3.4.11 短節擺放外部之s11比較圖
圖3.4.12 短節擺放外部之s21比較圖
圖3.4.13 步階型式短節結構圖(長度1:1)
圖3.4.14步階型式短節結構圖(長度微調)
圖3.4.15 步階型式短節s21圖
圖3.4.16步階形式短節d段結構圖
圖3.4.17步階形式短節d段模擬結果
圖3.5.1模擬最佳化結構
圖4.1 實作結構圖
圖4.2 實作與與模擬量測比較圖

表格目錄
表3.3.1 指叉間距模擬比較
表3.5.1 短節擺放位置比較
表3.5.2 短節放置於指叉位置表
表3.5.3 模擬最佳化結構

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