具旁生通帶抑制之槽孔耦合帶通濾波器設計

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姓名

洪啟彰(Chi-chang Hung) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

具旁生通帶抑制之槽孔耦合帶通濾波器設計
(Aperture-coupled filter design with harmonic suppression)

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摘要(中)

本論文提出一個使用槽孔耦合架構之帶通濾波器設計，並且對於旁生通帶之諧波具有良好的抑制能力。文獻上，傳統槽孔耦合結構的等效電路能夠用來模擬通帶的發生，然而對於傳輸零點以及倍頻響應並不能提出準確的描述；在本文中先以傳統等效電路為基礎，接著觀察上下層饋入線之間的電場分布，利用耦合線段以及相關的電容來修正傳統的電路模型，此修正後之等效電路對於槽孔耦合架構的響應，在倍頻以及傳輸零點的預測上產生了準確的等效模擬。接著控制等效電路中耦合線的奇偶模態阻抗值，改變饋入線之間的耦合量來調整通帶內之頻寬。最後配合著修正後之等效電路，在槽孔之間加入T型分支，產生額外的傳輸零點來抑制旁生通帶的發生，使得止帶上限可以由原本的兩倍主頻提升至四點五倍主頻。在本論文中帶通濾波器應用於數位電視頻段( 430-710 MHz )，使用厚度為0.8 mm的FR-4基板。本論文製作之帶通濾波器量測結果在通帶內( 430-710 MHz )之插入損耗與反射損耗值分別為0.9 dB以及12 dB，在三倍頻產生之旁生通帶可以獲得17 dB之抑制。全波模擬與量測結果有相當良好的吻合度。

摘要(英)

In this thesis, a design of the aperture-coupled filter and it’’s corresponding equivalent circuit will be presented. In the proposed filter, a back-to-back microstrip-slotline transition is used. Compared to the conventional equivalent circuit models of aperture-coupled structure, the proposed circuit model in this thesis has better characteristics in the locations of transmission zeros and harmonic frequency responses. By terminating microstrip lines with open stubs, the two ports of this circuit have good application in filter design. Based on the equivalent circuit models, we can properly adjust the dimensions of the ground-plane slot and the open stub for impedance matching and size reduction. Applying a T-shaped open stub at common ground plane, the first spurious passband of proposed filter could be suppressed. A filter design for digital TV ( 430-710 MHz ) applications is designed. The measured insertion loss and return loss are 0.9 dB and 12 dB, respectively. Suppression of spurious passband is greater than 17 dB. All circuits are fabricated on FR-4 substrates. Simulation and measurement are in good agreement.

關鍵字(中)

★ 濾波器
★ 槽孔耦合
★ 旁生通帶抑制

關鍵字(英)

★ filter
★ aperture-coupled
★ harmonic suppression

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 4
第二章微帶線饋入槽孔耦合架構 5
2-1 簡介 5
2-2 電效電路結構分析 6
2-3 改良式等效電路之分析 12
2-3-1 耦合傳輸線特性分析 12
2-3-2 加入寄生效應之等效電路 22
2-4 結論 25
第三章旁生通帶壓抑之槽孔耦合帶通濾波器 26
3-1 簡介 26
3-2 槽孔耦合濾波器通帶內頻寬調整的機制 27
3-3 槽孔耦合濾波器設計 35
3-3-1 開路分支電路特性分析 35
3-3-2 槽孔電路特性分析 39
3-3-3 槽孔耦合帶通濾波器模擬結果 41
3-3-4 模擬與實作結果比較 44
3-3-5 TRL校正後模擬於實作比較 47
3-4 旁生通帶之抑制機制 52
3-4-1 動機與簡介 52
3-4-2 旁生通帶的抑制 52
3-4-3 模擬結果 58
3-4-4 模擬與實作結果比較 60
3-4-5 TRL校準後模擬與實作結果比較 63
3-5 結論 65
第四章總結 66
參考文獻 68
附錄一 TRL理論基礎 71

參考文獻

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指導教授

丘增杰(Tsen-chieh Chiu)

審核日期

2009-7-20

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