臺灣博碩士論文加值系統

本研究以設計通訊系統前端的帶通濾波器為主，採用數種常用共振器結構組合而成，共完成三種功能之濾波器：單頻寬止帶、雙頻、及雙頻寬止帶帶通濾波器。
在單頻寬止帶帶通濾波器設計中，電路之主結構為一對均勻阻抗共振器，並利用不等長之開路負載樁抑制混附波，再透過適當折曲以縮小電路面積。本濾波器量測結果顯示通帶之中心頻率為2.7 GHz，插入損耗為0.79 dB，返回損耗為22.23 dB。另外止帶寬度可達3.7 f0，對混附波的抑制效果大於20 dB。該濾波器設計符合通訊協定IEEE802.11a之規定，可運用於藍芽。
在雙頻帶通濾波器設計中，電路之主結構為一對均勻阻抗共振器與一對缺陷接地結構，透過雙層結構可達到縮小電路面積的效果。本濾波器量測結果顯示通帶之中心頻率為2.4/3.54 GHz，插入損耗為2.33/2.19 dB，返回損耗為12.4/22 dB，通帶間的隔離度為40 dB。該電路符合通訊協定IEEE802.11a與IEEE802.16m之規定，本濾波器可用於藍芽與WiMAX。
在雙頻寬止帶帶通濾波器設計中，其電路之主結構為一對非對稱式步階阻抗共振器。利用開路負載樁原理抑制混附波，並加入阻抗轉換器與缺陷接地結構，減少通帶之損耗，再透過適當折曲以縮小電路面積。本濾波器量測結果顯示通帶之中心頻率為2.4/3.55 GHz，插入損耗為1.22/0.88 dB，返回損耗為20.1/21.7 dB，通帶間的隔離度為40 dB。另外止帶寬度可達3.5 f0，對混附波的抑制效果大於20 dB。該電路符合通訊協定IEEE802.11a與IEEE802.16m之規定，本濾波器可用於藍芽與WiMAX。

In this thesis, three filters based on several kinds of commonly used resonators are designed for the front-end module of the wireless communication system. These three filters include a single-band bandpass filter with a wide stopband, a dual-band bandpass filter, and a dual-band bandpass filter with a wide stopband.
A single-band bandpass filter with a wide stopband is proposed. A pair of uniform impedance resonators is employed as the main structure of the filter. Moreover, two asymmetrically open stubs are used to suppress harmonic response. The microstrip structure is further bended to minimize the size of the filter. According to the experimental result, the proposed bandpass filter has a center frequencies centered at 2.7 GHz with an insertion loss of 0.79 dB, and a return loss of 22.23 dB. The stopband of the filter is extended up to 3.7 f0 with rejection level better than 20 dB. The resultant filter meets the bluetooth standard.
A dual-band bandpass filter with multilayer is proposed. A pair of uniform impedance resonators and defected-ground resonators is employed as the main structure of the filter. The dual layer structure is used for the reduction of the size of the filter. According to the experimental result, the proposed bandpass filter has center frequencies centered at 2.4/3.54 GHz with insertion losses of 2.33/2.19 dB, and return losses of 12.4/22 dB. The isolation between passbands is about 40 dB. The resultant filter meets the bluetooth and WiMAX standards.
A dual-band bandpass filter with a wide stopband is proposed. A pair of asymmetric stepped impedance resonators is employed as the main structure of the filter. Moreover, open stub is used to suppress harmonic response. Two impedance converters and a defected-ground structure are used to reduce the insertion loss of the passbands. The impedance converters are bended to minimize circuit size. According to the experimental result, the proposed bandpass filter has center frequencies centered at 2.4/3.55 GHz with insertion losses of 1.22/0.88 dB, and return losses of 20.1/21.7 dB. The stopband of the filter is extended up to 3.5 f0 with rejection level better than 20 dB. The isolation between passband is about 40 dB. The resultant filter meets the bluetooth and WiMAX standards.

摘要 I
Abstract II
致謝 IV
目 錄 V
圖目錄 VII
表目錄 X
第1章 序論 1
1.1 無線通訊簡介 2
1.2 射頻濾波器介紹 4
1.2.1 濾波器種類 4
1.2.2 微帶線結構 5
1.2.3濾波器設計 7
1.3 重要文獻要覽 9
1.3.1 國外相關研究 9
1.3.1.1 單頻寬止帶帶通濾波器 9
1.3.1.2 雙頻帶通濾波器 13
1.3.1.3 雙頻寬止帶帶通濾波器 16
1.3.2 國內相關研究 19
1.3.2.1 單頻寬止帶帶通濾波器 19
1.3.2.2 雙頻帶通濾波器 27
1.3.2.3 雙頻寬止帶帶通濾波器 31
1.3.3 本實驗室相關研究 35
1.4 研究動機 38
1.5 論文架構 39
第2章 非對稱式步階阻抗共振器分析 40
2.1 非對稱式步階阻抗共振器 40
2.2 共振器耦合設計 41
2.2.1 磁耦合 42
2.2.2 電耦合 44
2.2.3 混合式耦合 46
2.3 耦合係數分析 48
2.4 外部品質因子分析 49
2.5 傳輸零點分析 51
2.5.1 開路負載樁 51
2.5.2 多重傳輸路徑 52
第3章 單頻寬止帶帶通濾波器 53
3.1 介紹 53
3.2 單頻寬止帶帶通濾波器電路 54
3.3 磁耦合設計 56
3.4 混附波抑制 57
3.4.1 寬度不等之開路樁 57
3.4.2 數目不等之開路樁 58
3.4.3 位置不等之開路樁 59
3.4.4 長度不等之開路樁 60
3.5 長饋入線上加入不等長開路樁 61
3.6 耦合分析 62
3.7 結果與討論 63
第4章 雙頻帶通濾波器 66
4.1 介紹 66
4.2 雙頻帶通濾波器電路 67
4.3 上層3.5 GHz通帶之均勻阻抗設計 69
4.4 下層2.4 GHz缺陷接地設計 72
4.5 具缺陷接地結構之雙頻帶通濾波器 74
4.6 結果與討論 76
第5章 雙頻寬止帶帶通濾波器 79
5.1 介紹 79
5.2 雙頻寬止帶帶通濾波器電路 80
5.3饋入位置分析 82
5.4 混附波抑制 84
5.5 匹配設計 86
5.5.1 λ/4阻抗轉換器 86
5.5.2 缺陷接地結構 88
5.6 止帶優化 89
5.7 結果與討論 92
第6章 結論與未來工作 95
參考文獻 96

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