臺灣博碩士論文加值系統

本論文以多頻帶濾波器為研究主題，分別提出三個體積小、結構簡單、低成本的帶通濾波器，皆適用於無線區域網路(WLAN)和全球互通微波存取(WiMAX)，於四頻帶通濾波器另外發展出可以個別應用於GSM1800( 1.71-1.88 GHz )之頻段，並實作於板厚0.8 mm、介電係數為4.4的FR4基板上。
首先介紹為雙頻帶通濾波器(dual-band bandpass filter)，使用四個半波長(λ/2)步階阻抗共振器(stepped impedance resonators)來設計，藉由改變步階阻抗共振器的阻抗比和長度來調整所需的設計頻帶，此帶通濾波器的兩個頻帶之中心頻率分別為2.68 GHz和5.27 GHz，濾波器主體的尺寸僅為20.4 ×12.5 mm2，體積微小以利於產品上之應用。實驗結果顯示，此濾波器符合WLAN ( 5200 MHz)以及WiMAX ( 2700/5500 MHz )之頻段。
然後提出一個三頻帶通濾波器( tri-band bandpass filter )，使用非對稱性之三段步階阻抗共振器( tri-section stepped impedance resonator )來設計，此帶通濾波器的三個頻帶之中心頻率分別為 2.41 GHz、3.6 GHz、5.86 GHz，此濾波器主體尺寸22.2 × 29.8㎜2。實驗結果顯示，此濾波器符合WLAN ( 2400/5800 MHz )以及WiMAX ( 2500/3500/5500 MHz )之頻段。
最後介紹一個四頻帶通濾波器( quad-band bandpass filter )，使用非對稱式步階阻抗共振器( asymmetric stepped impedance resonators )來設計，此四頻帶通濾波器架構分為兩部分，其中一部分是設計操作在第一及第三頻帶( 1.85/3.75 GHz )，另一部分則設計操作在第二和第四頻帶( 2.75/5.25 GHz )，藉由調整非對稱步階式阻抗共振器的阻抗比和長度比，一個四頻帶通濾波器可以被設計完成，實驗結果顯示，此濾波器符合GSM1800( 1.71-1.88 GHz )、WLAN ( 5200 MHz )以及WiMAX ( 2700/3600 MHz )之頻段。
本論文提出的三個帶通濾波器，其量測和模擬之間均有良好的一致性，因此可以被使用於無線通信的相關產品上。

In this paper, a multi-band filter as the research subject, are three small size, simple structure, and low cost bandpass filters, are applicable to wireless local area networks (WLAN) and the worldwide interoperability for microwave access (WiMAX). In addition to develop can be individually applied to GSM1800 (1.71-1.88 GHz) band in the four band pass filter, and implemented in 0.8 mm thickness, dielectric coefficient is 4.4 on the FR4 substrate.
First introduced for dual-band bandpass filter, using twoλ/2 stepped impedance resonators to design, through the impedance change of stepped impedance resonators and the ratio of electrical length to adjust, the design frequency required band, the center frequency of the bandpass filter is 2.68 GHz and 5.27 GHz, the main size only 20.4 x 12.5 mm2. The experimental results show, the filter with WLAN (5200 MHz) and WiMAX (2700/5500 MHz) of the band.
Next, a tri-band bandpass filter, the use of three asymmetric stepped-impedance resonators to design, the bandpass filter with the center frequency of three bands is 2.41 GHz, 3.6 GHZ, 5.86 GHz, the filter main size only 22.2 x 29.8 mm2. The experimental results show, the filter with WLAN (2400/5800 MHz) and WiMAX (2500/3500/5500MHz) of the band.
Finally, a quad-band bandpass filter, the use of asymmetric stepped-impedance resonators to design, the quad-band bandpass filter architecture is divided into two parts, one part is designed to operate at the first and third passbands (1.85/3.75 GHz), the other part design and operation in the second and fourth passbands (2.75/5.25, GHz) by impedance adjusting asymmetric stepped-impedance resonator ratio and electrical length ratio, a four band pass filter can be designed, the experimental results show that, the filter with GSM1800 ( 1.71-1.88 GHz ), WLAN ( 5200 MHz ) and WiMAX ( 2700/3600MHz ) of the band.
The three bandpass filter is proposed in this paper, the measurement and simulation are in good agreement, related to products can therefore be used for wireless communication.

目　　錄
誌　　謝 i
摘　　要 ii
Abstract iv
目　　錄 vi
圖 目 錄 ix
表 目 錄 xii
第一章 序論 1
1.1 研究動機及背景 1
1.2 文獻導覽 1
1.3 章節介紹 2
第二章 濾波器理論 3
2.1 濾波器響應簡介 3
2.2 濾波器特性參數 6
2.2.1 中心頻率 6
2.2.2 插入損失 6
2.2.3 漣波 6
2.2.4 dB頻寬 7
2.2.5 衰減速率 7
2.2.6 混附波 7
2.2.7 品質因素 8
2.2.8 群延遲 8
2.3 電路模型 9
2.3.1 巴特沃茲低通濾波器原型 9
2.3.2 柴比雪夫低通濾波器原型 13
2.4 步階阻抗濾波器 17
第三章 多頻帶通濾波器 21
3.1 雙頻帶通濾波器 21
3.1.1 概述 21
3.1.2 共振條件 21
3.1.3 負載傳輸線分析 23
3.1.4 濾波器分析與探討 24
3.1.5 模擬與量測結果 28
3.1.6 結論 29
3.2 三頻帶通濾波器 30
3.2.1 概述 30
3.2.2 濾波器設計結構與流程 30
3.2.3 濾波器分析與探討 33
3.2.4 模擬與量測結果 35
3.2.5 結論 37
3.3 四頻帶通濾波器 39
3.3.1 概述 39
3.3.2 濾波器設計結構與流程 39
3.3.3 濾波器分析與探討 41
3.3.4 模擬與量測結果 46
3.3.5 結論 48
第四章 總結 49
參考文獻 51

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