臺灣博碩士論文加值系統

本論文提出一種使用非對稱式均勻阻抗負載樁共振器(Asymmetric uniform stub loaded resonators , AUSLRs)分析。利用輸入導納分析繪製出共振圖，藉由共振圖可自由地設計共振器的模態，並應用於多頻帶通濾波器設計。
在雙頻帶通濾波器設計中，輸入導納分析繪製出共振圖並利用交錯式耦合提供額外的傳輸零點，讓通帶間能有良好的隔離性。該結構可提供緊湊面積，而且使用一組共振器設計雙頻帶通濾波器。利用交錯式技術能近一步更能減少濾波器的面積。此濾波器中心頻帶通濾設計在2.44/3.55 GHz，插入損失為2.5/2.8 dB，傳輸零點的位置在2.2/2.8 GHz，完全符合WLAN與WiMAX的應用。
在三頻帶通濾波器設計中，利用與雙頻設計概念相同的輸入導納分析繪製出共振圖並利用交錯式耦合提供額外的傳輸零點，讓通帶間能有良好的隔離性。該結構可提供緊湊面積，而且使用一組共振器設計三頻帶通濾波器。此濾波器中心頻率設計在1.45/2.7/3.55 GHz，插入損失為0.9/1.75/2.1 dB，傳輸零點的位置在1.27/2.04/3.37/3.67 GHz，可以應用在WLAN及WiMAX上。
在四頻帶通濾波器設計中，利用與雙頻設計概念相同的輸入導納分析繪製出共振圖並利用交錯式耦合提供額外的傳輸零點，讓通帶間能有良好的隔離性。該結構可提供緊湊面積，而且使用一組共振器設計四頻帶通濾波器。此濾波器中心頻率設計在0.89/1.92/2.35/3.31 GHz，插入損失為0.37/0.72/0.99/1.06 dB，傳輸零點的位置在0.7/1.4/1.7/2.1/2.67/2.74/3.58 GHz，可以應用在GSM、WLAN及藍牙上。
在五頻帶通濾波器設計中，利用與雙頻設計概念相同的輸入導納分析繪製出共振圖並利用交錯式耦合提供額外的傳輸零點，讓通帶間能有良好的隔離性。該結構可提供緊湊面積，而且使用一組共振器設計五頻帶通濾波器。此濾波器中心頻率設計在0.87/1.99/2.48/3.52/4.42 GHz，插入損失為0.99/1.2/1.09/1.48/2.15 dB，傳輸零點的位置在0.75/1.06/2.27/2.78/3.62/4.29/4.77 GHz，可以應用在GSM，WLAN，WiMAX及藍牙上。
關鍵詞：三頻帶通濾波器、四頻帶通濾波器、五頻帶通濾波器、帶通濾波器、非對稱式負載裝均勻阻抗共振器、傳輸零點。

This thesis presents the design of the multi-band bandpass filter (BPF) using the stub-loaded resonators structure. The possible resonant modes can be found by deriving the input admittance of the resonators. The resonant figure contains the information about the possible resonator modes to be chosen. The passbands of the filters are supported by the modes. In the thesis, four different bandpass filters designed for various applications of interest are discussed.
The proposed dual-band BPF is composed of a uniform impendence resonator (UIR) and a loaded stub connected to the UIR with different electronic lengths to form a stub loaded resonator (SLR). The SLR is used to design a compact dual-band bandpass filter (BPF). The resonant modes of the SLR form the passbands of the BPF. The center frequencies of the passbands of the BPF are determined by the length ratios. The BPF exhibits good passband performance with center frequencies of 2.44 and 3.55 GHz with low insertion losses of 2.5 and 2.8 dB, respectively. The transmission zeros are also obtained near the passband at 2.5 and 2.8 GHz. The BPF is compact due to the interdigital coupling design. The transmission zeros are created close to the first passband edge, which results in high selectivity. The measured results agree well with the simulated ones.
The second BPF is a tri-band BPF, which is constructed by a pair of asymmetric uniform stub-loaded resonators (AUSLRs). The center frequencies of the BPF are obtained by properly controlling the location of the stub and length ratio of the AUSLR. The center frequencies of the resultant BPF are located at 1.4, 2.6, and 3.5 GHz with low insertion losses of 0.9, 1.75, and 2.7 dB, respectively. The transmission zeros are also obtained near the passband at 1.27, 2.04, 3.37, and 3.67 GHz. Moreover this AUSLR structures create transmission zeros close to each passband edge, resulting in high selectivity, good isolation, and compact size. The measured results agree well with the simulated ones.
The third BPF is designed to have four passbands. The quad-band BPF is studied for the first time by using an asymmetric uniform stub-loaded resonator (AUSLR). The passbands of the proposed filter are designed for global system for mobile communications (GSM) and wireless local area network (WLAN) at 0.89, 1.92, 2.35, and 3.31 GHz. The passbands are centered at 0.9, 1.96, 2.4, and 3.35 GHz with low insertion losses of 0.37, 0.72, 0.99, and 1.06 dB, respectively. The transmission zeros are also obtained near the passband at 0.7, 1.4, 1.7, 2.1, 2.6, 2.7, and 3.6 GHz. The measurement results are in line with the simulation ones. As a result, the quad-band filter is proven to be compact, low-loss, and high selectivity.
The last proposed filter is quint-band BPF. The BPF is studied for the first time by using asymmetric uniform stub-loaded resonators (AUSLRs). The passband of the proposed filter is designed for global system for GSM, Bluetooth, WiMAX, and WLAN applications and the center frequencies are located at 0.91, 1.92, 2.43, 3.48, and 4.4 GHz. The passbands are centered at 0.87, 1.99, 2.48, 3.52, and 4.42 GHz with insertion losses of 0.99, 1.2, 1.09, 1.48, and 2.15 dB, respectively. The transmission zeros are also obtained near the passband at 0.75, 1.06, 2.27, 2.78, 3.62, 4.29, and 4.77 GHz. The measurement results are in line with the simulation ones. As a result, the quint-band filter is proven to be compact, low-loss, and high selectivity.

Keyword: bandpass filter, tri-band, quad-band, quint-band, asymmetric uniform stub-loaded resonator, transmission zero.

摘 要 I
Abstract III
誌 謝 V
目 錄 VI
圖 目 錄 VIII
表 目 錄 X
第1章 序論…………………………………………………………………………..1
1.1 無線通訊簡介………………………………………………………………1
1.2 平面濾波器的種類…………………………………………………………3
1.3 微帶線的結構………………………………………………………………4
1.4 非對稱負載樁帶通濾波器文獻研究………………………………………4
1.4.1 負載樁雙頻帶通濾波器…………………………………………4
1.4.2 負載樁三頻帶通濾波器…………………………………………7
1.4.3 負載樁四頻帶通濾波器………………………………………..11
1.4.4 非對稱式負載樁雙頻帶通濾波器……………………………..13
1.5 論文架構…………………………………………………………………..17
第2章 非對稱式均勻阻抗負載樁共振器分析…………………………………..18
2.1 序論………………………………………………………………………..18
2.2 分析負載樁共振器及非對稱式均勻阻抗負載樁共振器………………..18
2.2.1 分析負載樁共振器……………………………………………..18
2.2.2 分析非對稱式均勻阻抗負載樁共振器……...………………...20
2.3 耦合分析…………………………………………………………………..21
2.3.1 電耦合…………………………………………………………..22
2.3.2 磁耦合…………………………………………………………..24
2.3.3 混合式耦合……………………………………………………..26
2.3.4 耦合因素及外部品質因素……………………………………..28
2.3.4.1 耦合因素…………………………………………………..28
2.3.4.2 外部品質因素……………………………………………..29
第3章 利用非對稱式均勻阻抗負載樁共振器製作多頻帶通濾波器…………..32
3.1 利用負載樁共振器製作雙頻帶通濾波器…………….………………….32
3.1.1 介紹……………………………………………………………..32
3.1.2 雙頻帶通濾波器之設計………………………………………..32
3.1.2.1 共振器結構………………………………………………..32
3.1.2.2 耦合方式…………………………………………………..35
3.1.2.3 濾波器電路………………………………………………..38
3.1.3 結果與討論……………………………………………………..39
3.1.4 小結……………………………………………………………..40
3.2 利用非對稱式均勻阻抗負載樁共振器製作三頻帶通濾波器…………..41
3.2.1 介紹……………………………………………………………..41
3.2.2 設計三頻帶通濾波器…………………………………………..42
3.2.2.1 分析共振器………………………………………………..43
3.2.2.2 分析耦合方式……………………………………………..43
3.2.3 結果與討論……………………………………………………..45
3.2.4 小結……………………………………………………………..46
3.3 利用非對稱式均勻阻抗負載樁共振器製作四頻帶通濾波器…..………46
3.3.1 介紹……………………………………………………………..46
3.3.2 設計四頻帶通濾波器…………………………………………..47
3.3.2.1 分析共振器………………………………………………..47
3.3.2.2 分析耦合方式……………………………………………..49
3.3.3 結果與討論……………………………………………………..52
3.3.4 小結……………………………………………………………..54
3.4 利用非對稱式均勻阻抗負載樁共振器製作五頻帶通濾波器……..……54
3.4.1 介紹……………………………………………………………..54
3.4.2 設計四頻帶通濾波器…………………………………………..55
3.4.2.1 分析共振器………………………………………………..55
3.4.2.2 分析耦合方式……………………………………………..56
3.4.3 結果與討論……………………………………………………..57
3.4.4 小結……………………………………………………………..59
第4章 結論與展望………………………………………………………………..60
參考文獻……………………………………………………………………………..61

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