可獨立開關式四頻帶通濾波器與具帶通特性之單刀四擲切換器及可開關式四工器

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翁思琪(Sz-chi Weng) 查詢紙本館藏

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電機工程學系

論文名稱

可獨立開關式四頻帶通濾波器與具帶通特性之單刀四擲切換器及可開關式四工器
(Independently Switchable Quad-Band Bandpass Filter, Bandpass SPQT Switch, and Switchable Quadruplexer)

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摘要(中)

在本論文中利用在步階式阻抗共振器(Stepped-impedance resonator, SIR)末端加上二極體負載製作成可開關式的帶通濾波器。此負載的二極體可改變步階式阻抗共振器共振條件。由於散佈式耦合的饋入技術的低負載效應，因此不需要複雜的匹配網路來設計多頻帶的電路。
本論文之四頻帶通濾波器電路架構包含二分之一波長步階式阻抗共振器、四分之一波長步階式阻抗共振器。每個通帶皆由一對共振器控制可增加設計自由度，並且使用散佈式耦合技術減少頻帶間的負載效應，即可將四個帶通濾波器整合在一起。其中，使用開路殘段與在饋入線末端加上電容元件皆為了增加傳輸零點以提升通帶之選擇度。將二極體負載接在共振器末端以設計可獨立開關四個頻帶的可調式裝置。
利用散佈式耦合的饋入架構、非對稱式四分之一波長共振器、並聯開路殘段與負載二極體可設計出具有帶通特性之單刀四擲切換器(Single-pole-quadruple-throw, SPQT)及可開關式四工器，其皆具有高隔離度及寬止帶的特性。在隔離度的部分可以達到35 dB 以上，20-dB止帶可達到13倍的最低操作中心頻率。最後，在本論文中利用實作之電路驗證設計的方法是有效的。

摘要(英)

Stepped-impedance resonators with diodes loaded at one end are used to develop switchable bandpass filters in this thesis. The loaded diodes are used to switch the resonance conditions of the stepped-impedance resonators. Due to the low loading effect from distributed coupling technique, the proposed circuits can obtain many channels without the need of complicated matching network.
The switchable quad-band bandpass filter consisting of half-wavelength/quarter- wavelength resonator. Each passband is controlled by a respective pair of resonators to increase design freedom, and the four BPFs are combined by utilizing distributed coupling technique to reduce channel-to-channel loading effect. The loaded open stubs and the source-load coupling capacitor are used to introduce transmission zeros to improve in-band selectivity. The p-i-n diodes are loaded at the end of the resonators as the switching devices to independently control the four passbands.
The bandpass SPQT switch and the switchable quadruplexer consisting of distributed coupling technique feeding line, asymmetrical quarter-wavelength resonators, shunt open stubs, and p-i-n diodes features compactness, high isolation and wide stopband. The isolation is better than 35 dB and the 20-dB stopband extends up to 13the lowest operation center frequency. Finally, to validate the design concept, theory as well as experiment are presented and compared in this article.

關鍵字(中)

★ 多工器
★ 四頻帶通濾波器
★ 四工器
★ 具帶通特性單刀四擲切換器

關鍵字(英)

★ multiplexer
★ quad-band bandpass filter
★ quadruplexer
★ Bandpass SPQT switch

論文目次

摘要 ......................................................I
ABSTRACT.................................................II
致謝 ................................................III
目錄 .................................................IV
圖目錄 .................................................VI
表目錄 .................................................IX
第一章緒論 ..........................................1
1-1 研究動機 ..........................................1
1-2 文獻回顧 ..........................................2
1-3 章節介紹 ..........................................7
第二章可獨立開關式之四頻帶通濾波器 ..........................8
2-1 簡介 ..................................................8
2-2 步階式阻抗共振器的基本原理 ..........................8
2-3 四頻帶通濾波器的設計理論 .................................13
2-3.1 四頻帶通濾波器的設計 .................................13
2-3.2 利用傳輸零點提升四頻帶通濾波器之選擇度....................22
2-4 可獨立開關式的四頻帶通濾波器設計及模擬與量測結果 .........25
2-5 結論 .................................................33
第三章具寬止帶且帶通特性之單刀四擲切換器 .................34
3-1 簡介 .................................................34
3-2 具帶通特性單刀四擲切換器設計理論 .........................34
3-2.1 射頻前端電路系統設計 .................................34
3-2.2 使用散佈式耦合的饋入架構之設計 .........................35
3-2.3 帶通之單刀四擲切換器設計 .........................37
3-3 具寬止帶且帶通特性之單刀四擲切換器設計及模擬與量測結果 .........42
3-4 結論 .................................................49
第四章具寬止帶之可開關式四工器 .........................50
4-1 簡介 .................................................50
4-2 散佈式耦合饋入架構之四工器設計理論 .........................50
4-2.1 使用λ/2步階式阻抗共振器設計之四工器(Case 1) .........51
4-2.2 使用λ/4步階式阻抗共振器設計之四工器(Case 2) .........53
4-2.3 使用不同的λ/4步階式阻抗共振器設計之四工器(Case 3) .........55
4-3 具寬止帶且可開關式四工器設計及模擬與量測結果(FINAL CIRCUIT)..60
4-4 結論 .................................................68
第五章結論................................................69
參考文獻 .................................................71

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指導教授

凃文化(Wen-hua Tu)

審核日期

2012-11-29

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