基於基板合成波導與微帶線混合結構實現寬止帶之帶通濾波器與雙工器

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姓名

李佳璟(Li-jia-jing) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

基於基板合成波導與微帶線混合結構實現寬止帶之帶通濾波器與雙工器
(Wide Stopband Bandpass Filter and Diplexer Based on SIW and Microstrip Hybrid Structure)

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摘要(中)

本論文提出了一種結合基板合成波導共振器和微帶線共振器的混合結構，並應用於設計具有寬止帶特性的帶通濾波器和雙工器。該結構旨在克服單一結構的限制，通過在電路輸入和輸出端配置基板合成波導共振器來提高頻寬，同時在電路架構中整合微帶線共振器以減少整體電路面積。此設計能夠利用不同類型共振器的架構，錯開其高階模態頻率，實現寬止帶響應。在本文中，帶通濾波器的中心頻率操作於3.5 GHz。設計中對基板合成波導腔體的形狀進行了改造，並與四分之一波長步階阻抗共振器相結合。同時，在基板合成波導腔體中嵌入槽孔，以引入槽孔模態來干擾雜散模態，提升止帶表現。此外，設計中將四分之一波長步階阻抗共振器的尺寸縮小，以減少面積，從而實現整體電路的緊湊化效果。在下一個雙工器電路中，兩通帶之中心頻率分別操作於2 GHz與4 GHz，通過將終端短路步階阻抗共振器整合到半模共振器與四分之一模共振器之間，來操作其基頻與第一高階模態頻率，以實現寬止帶特性。第一級電路的半模共振器，操作的模態為TE101與TE301，其在文中進行了改造，通過改變基板合成波導的金屬通孔邊界，在保留原尺寸之情況下，降低了兩模態頻率，從而減少電路導波波長單位面積。兩個電路的章節末皆有提供量測數據與模擬結果之比較，以驗證設計。

摘要(英)

This thesis proposes a hybrid structure combining substrate integrated waveguide (SIW) resonators and microstrip line resonators for designing bandpass filters and diplexers with wide stopband characteristics. The design enhances bandwidth by configuring SIW resonators at the input and output ports, while integrating microstrip line resonators to reduce overall circuit area. This approach exploits different resonator structure to stagger higher-order mode frequencies, achieving wide stopband responses. For the bandpass filter, operating at 3.5 GHz, the design modifies the SIW resonator cavity shape, combines it with a quarter-wavelength stepped impedance resonator, and embeds slots for improved stopband performance. The size of the quarter-wavelength stepped impedance resonator is reduced to achieve circuit compactness. In the diplexer circuit, with center frequencies at 2 GHz and 4 GHz, shorted-end stepped impedance resonators are integrated between half-mode resonators and quarter-mode resonators to control fundamental and high-order mode frequencies for wide stopband characteristics. Modification of the half-mode resonator in the first-order circuit decreases mode frequencies while maintaining original size, reducing the circuit area. Both circuits provide measurement data and simulation results comparison for validation.

關鍵字(中)

★ 基板合成波導
★ 帶通濾波器
★ 雙工器
★ 寬止帶

關鍵字(英)

★ Substrate Integrated Waveguide
★ Bandpass filter
★ Diplexer
★ Wide stopband

論文目次

國立中央大學 i
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 濾波器簡介 1
1-2 研究動機 3
1-3 相關研究現狀 4
1-4 章節概述 5
第二章基板合成波導技術與共振器應用 6
2-1 基板合成波導概念 6
2-1-1 基礎概念 6
2-1-2 SIW矩形腔體 7
2-2 SIW腔體切割 8
2-3 圓形基板合成波導 10
2-4 步階阻抗共振器 11
2-4-1 四分之一波長步階阻抗共振器 11
2-4-2 終端短路步階阻抗共振器 12
第三章基板合成波導與微帶線混合架構之寬止帶帶通濾波器 15
3-1 具寬止帶帶通濾波器架構與介紹 15
3-2 具寬止帶濾波器設計原理 16
3-2-1 衍生SIW腔體設計 17
3-2-2 槽孔模態分析 18
3-2-2 槽孔模態頻率控制 19
3-2-3 基板合成波導與微帶線混合架構 20
3-3 濾波器設計與參數分析 21
3-3-1 參數萃取 22
3-4 模擬與量測 28
第四章基板合成波導與微帶線混合架構之寬止帶雙工器 32
4-1 雙工器原理與架構 32
4-2 半模雙模態SIW腔體階段設計 33
4-3 雙工器設計 39
4-3-1 基板合波導與微帶線混合架構 39
4-3-2 參數萃取 41
4-3-3 止帶實現與通道規劃 43
4-4 具寬止帶雙工器之模擬與量測 44
第五章結論 49
第六章參考文獻 50

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指導教授

凃文化(Wen-Hua Tu)

審核日期

2024-7-11

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