四通道可切換式帶通濾波器之研究

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姓名

李嘉倫(Chia-Lun Li) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

四通道可切換式帶通濾波器之研究
(Research on Four-Channel Switchable Bandpass Filter Bank)

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摘要(中)

本論文使用SP4T的開關元件，去切換4條不同的通帶路徑，而此四個通帶中心頻率個別為1.25 GHz、1.75 GHz、2.25 GHz、2.75 GHz，都是500 MHz的頻寬，意味著在最低中心頻率的通帶比例頻寬最大。所以本論文比較各種不同的電路，去選擇較適合的電路設計，配合不同中心頻率和比例頻寬的通帶，並且使用金屬屏蔽盒，屏蔽來自外界的雜訊，提高止帶的響應特性，搭配前後各一個SP4T 開關元件，最後設計出四通道可切換式帶通濾波器。
利用比較不同論文和文獻上的電路設計，去使用選擇度最好，並且面積較小的設計。比較下來，最低頻且頻寬最大的通帶，則使用三模態共振器去完成，又因為使用較厚的電路板，在共振器之間擁有較大的耦合量，共振器之間可以使用較大的間隙(gap)，提高蝕刻製程的成功率。所以其他三個較低頻寬的通帶可以使用傳統的hairpin帶通濾波器，擁有不錯的選擇度外，電路設計可以使用chebyshev原型參數，套用公式計算出的Q值和M值去匹配電路，擁有完整的設計流程，去完成通帶主體的電路設計。
但是中心頻率為2.25 GHz的通帶，因為止帶內有二次諧波產生的旁生通帶，不符合所要求止帶內S21-20 dB的壓制，所以使用步階式阻抗共振器(Stepped Impedance Resonator)，把二次諧波推往更高頻的頻率，讓止帶符合規格要求。而在SP4T的焊接上，針對於QFN (Quad Flat No-Lead )packages 腳位和QSOP-16 (Quarter Size Outline Package) 腳位，則各提出一個不需要過高成本，但是卻可以提高焊接成功率的實務方法，最後完成整個電路設計，整體電路尺寸大小為13 cm × 8.5 cm，各個通帶S21最低點為-5.5 dB、-8.58 dB、-7.84 dB、-7.91 dB，在止帶部分則都低於-20 dB，並且通帶具有可切換的特性。

摘要(英)

This thesis uses SP4T to switch the four different passband paths. The center frequencies of four passband are 1.25 GHz, 1.75 GHz, 2.25 GHz, and 2.75 GHz. Both of them are 500 MHz bandwidth, and the other hand the lower center frequency, the higher passband bandwidth be.
By comparing different circuits, chooses the better circuit design to match the passbands of different center frequencies and bandwidths. With the metal housing to shield the noise from the outside can improve the response of the stopband. And the circuit used two SP4T to complete the design of the four-channel switchable bandpass filter.
By comparing the different circuit design, use the design with the best selectivity and smaller area. The three-mode resonator is used to design the band 1. And the others use the hairpin bandpass filter, because the thicker PCB has stronger coupling in the same gap to improve the success rate of the etching process. And even can use the Chebyshev prototype parameters to design the bands systematically.
However, the passband of the 2.25 GHz center frequency used stepped impedance resonator (Stepped Impedance Resonator) to make the first harmonic frequency higher. And there are two different welding process for the QFN and QSOP package to improve the success rate of welding and even low cost. The circuit size finally is 13 cm × 8.5 cm. The lowest insertion loss of each passband is 5.5 dB, 8.58 dB, 7.84 dB and 7.91 dB. The S21 of the stop band is all below -20 dB, and each passband is switchable.

關鍵字(中)

★ 單刀四擲
★ 柴比雪夫
★ 帶通濾波器
★ 可切換

關鍵字(英)

★ SP4T
★ Chebyshev
★ Bandpass filter
★ Switchable

論文目次

目錄
摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 x
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 3
第二章帶通濾波器基本設計原理 5
2.1　集總式濾波器 5
2.2　分散式帶通濾波器 10
2.3　耦合係數與外部品質因素 15
2.3.1　電耦合 15
2.3.2　磁耦合 17
2.3.3　混合式耦合 18
2.3.4　外部品質因素 20
第三章不同濾波器設計比較 22
3.1 簡介 22
3.2 濾波器種類的選擇 24
3.2.1 5-pole shorted Stub BPF 24
3.2.2 BPF Using Loaded Open-Loop Resonator 25
3.2.3 BPF using cross-shaped triple-mode resonator 26
3.2.4 Hairpin Bandpass Filter 28
3.3 初步四通道可切換式帶通濾波器設計 30
3.4 帶通濾波器實作與誤差修正 35
第四章簡易金屬屏蔽盒應用 38
4.1 簡介 38
4.2 2018 APMC學生競賽電路設計範例 38
4.3 有金屬屏蔽盒的帶通濾波器實作 41
第五章開關元件SP4T的使用 44
5.1　可調變濾波器設計基本原理 44
5.2　選定的SP4T 規格介紹 44
5.3　SP4T 使用的電路layout設計和焊接方法 48
5.4　SP4T使用的電路量測配置和步驟 56
5.5　SP4T使用的電路量測S參數結果 59
第六章四通道可切換式帶通濾波器量測結果 64
6.1　四通道可切換式帶通濾波器量測結果 64
6.2　結論 68
第七章結論 69
參考文獻 71
附錄 74

參考文獻

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[26] QPC6044 的datasheet 從https://www.qorvo.com/products/d/da000272
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指導教授

凃文化(Wen-Hua Tu)

審核日期

2019-8-13

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