臺灣博碩士論文加值系統

現今許多文獻在濾波器電路設計上越來越複雜，因使用了多種不同種類之共振器，使得分析難度大大提升。也因無法單獨調控通帶之中心頻率，造成多頻電路設計上之困難。為此，本研究希望達到電路結構簡化及通帶之獨立調控，並使電路具寬止帶之特性。本研究共計完成四種不同種類之濾波器：緊湊型寬止帶帶通濾波器、窄通帶間距雙頻寬止帶帶通濾波器、三頻雙工器及三頻寬止帶帶通濾波器。
在緊湊型雙頻寬止帶帶通濾波器中，使用一對負載樁共振器加上一對均勻阻抗共振器所設計而成。饋入線採包覆式饋入，可使得電路產生多重耦合路徑，提升混附波之抑制效果，濾波器之止帶寬度可達5.3 f0。另外，兩通帶之共振點不同，可獨立操控兩通帶之中心頻率。本濾波器之中心頻率為1.85/3.69 GHz，符合LTE與WiMAX應用頻段。
在窄通帶間距雙頻寬止帶帶通濾波器中，沿用上述緊湊型雙頻寬止帶帶通濾波器之主體架構。利用兩通帶能夠獨立操控之特性，將兩通帶的中心頻率做在2.28/2.8 GHz，其兩通帶間距只有0.52 GHz。另外，結合多重耦合路徑與負載樁共振器結構，使通帶之間產生零點，以提高隔離度。本電路之止帶寬度為4.38 f0。
在三頻雙工器中，採用之前緊湊型雙頻寬止帶通濾波器作為主體，在饋入線上電流密度較高的部分，擺放一對均勻阻抗共振器產生第三個通帶，並利用共振器貼齊饋入線之方式增加耦合量並減少面積。本三工器之中心頻率為1.78/2.71/3.37 GHz。
在三頻寬止帶帶通濾波器中，採用一對均勻阻抗共振器加上兩對負載樁共振器組合而成，在共振器外圍採用了包覆式饋入線，以提升混附波之抑制效果，使止帶寬度達到10.9 f0。另外，通帶之間具有傳輸零點，以提高隔離度。由於濾波器之三通帶共振點均不相同，可以獨立操控，本濾波器之中心頻率為1.83/2.62/3.69 GHz，符合LTE與WiMAX之所屬應用頻段。

Recently, circuit design of electrical filters in many literatures becomes complicated. It is difficult to analyze those filters because several types of resonators are used in their design. For multiband application, it is desirable to have a structure such that the center frequency for each passband can be adjusted independently. In addition, a wide stop band is also attractive in bandpass filter design. In this study, four circuits are proposed. There are a compact dual-band bandpass filter with wide stopband, a wide-stopband dual-band bandpass filter with close center frequencies of the passbands, a tri-band diplexer, and a tri-band bandpass filter with wide stopband.
The compact dual-band bandpass filter with wide stopband is composed of a pair of the uniform impedance resonators and a pair of the stub-loaded resonators. A multiple-coupling feeding scheme is used to enhance the coupling efficiency and suppress the noise. The center frequencies of the passbands can be independently adjusted by controlling the lengths of the uniform impedance resonators. As a result, the center frequencies are located at 1.85/3.69 GHz, suitable for LTE and WiMAX applications. The proposed filter has a wide stopband of about 5.3 f0.
The wide-stopband dual-band bandpass filter with close center frequencies of the passbands is composed of a pair of the uniform impedance resonators and a pair of the stub-loaded resonators. By controlling the lengths of the uniform impedance resonators and stub-loaded resonators independently, the small spectral difference between the center frequencies of the passbands can be made. Transmission zeros generated near the skirts of the passbands greatly improve selectivity and isolation of the filter. As a result, the center frequencies are located at 2.28/2.80 GHz, and the spectral between of the two passbands are only 0.52 GHz. The proposed filter has a wide stopband of about 4.38 f0.
The tri-band diplexer is composed of two pairs the uniform impedance resonators and a pair of the stub-loaded resonators. We put one pair of the uniform impedance resonators near the coupling line where current density is high to form the third passband. By tapping the resonator near the feeding line, one can increase the coupling efficiency and reduce the circuit size. As a result, the center frequencies are located at 1.78/2.71/3.37 GHz.
The tri-band bandpass filter with wide stopband is composed of a pair of uniform impedance resonators and two pairs of the stub-loaded resonators. The resonant frequency of each passband can be independently adjusted by controlling the lengths of the uniform impedance resonators and the stub-loaded resonators. As a result, the center frequencies are located at 1.83/2.62/3.69 GHz, suitable for LTE and WiMAX applications. Transmission zeros generated near the skirts of the passbands greatly improve selectivity and isolation of the filter. The proposed filter has a wide stopband of about 10.9 f0.

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 無線通訊系統2
1.2 射頻濾波器7
1.2.1 濾波器與傳輸線種類7
1.2.2 平面式微帶線濾波器9
1.3 實驗室相關研究11
1.4 研究動機17
1.5 論文架構19
第2章 研究方法20
2.1 設計流程20
2.2 負載樁共振器22
2.3 共振器耦合24
2.3.1 電耦合24
2.3.2 磁耦合26
2.3.3 混合式耦合28
2.4 耦合係數30
2.5 外部品質因子31
2.6 傳輸零點34
2.6.1 開路負載樁34
2.6.2 多重傳輸路徑35
第3章 雙頻寬止帶帶通濾波器36
3.1 相關文獻回顧36
3.2 緊湊型雙頻寬止帶帶通濾波器43
3.2.1 特性分析45
3.2.2 實驗結果50
3.3 窄通帶間距雙頻寬止帶帶通濾波器52
3.3.1 最佳化方式53
3.3.2 實驗結果56
3.4 結果與討論58
第4章 三頻雙工器60
4.1 相關文獻回顧60
4.2 帶通濾波器設計65
4.3 三頻雙工器設計67
4.4 最佳化分析68
4.5 結果與討論72
第5章 三頻寬止帶帶通濾波器76
5.1 相關文獻回顧76
5.2 三頻寬止帶帶通濾波器85
5.3 特性分析86
5.3.1 負載樁之差異86
5.3.2 獨立操控通帶88
5.3.3 零點與止帶操控91
5.4 結果與討論93
第6章 結論96
參考文獻98
個人簡歷表102

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