臺灣博碩士論文加值系統

本論文提出兩種濾波器，第一種為可變型態之帶通與帶拒濾波器，第二種為交錯式異頻共振器之雙頻帶通濾波器。可變型態之帶通與帶拒濾波器其架構為雙模環型共振器，並利用壓控可變電容控制微擾強度，改變奇偶波模之波速，藉以產生帶通響應與帶拒響應。此方式產生之響應會有中心頻率不一致的問題，因此在本論文探討頻率修正的機制，和討論各微擾的架構。並實製可變型態環型帶通帶拒濾波器以驗證上述理論。量測結果顯示在帶通響應時，中心頻率2.45 GHz的植入損失為1.6 dB，反射損失則大於20 dB。而在帶拒響應時，從2.38 GHz 到2.8 GHz有20-dB的頻帶抑制度。第二種為交錯式異頻共振器之雙頻帶通濾波器，本電路利用交錯排列不同共振頻率之共振器的方式，在第一通帶時，第一組步階阻抗共振器產生共振，而第二組步階阻抗共振器則扮演輸入輸出端的耦合電路；而在第二通帶時，第二組步階阻抗共振器產生共振，此時第一組共振器在此通帶頻率的作用則為加強耦合強度。最後以此理論設計中心頻率為2.4 GHz與5.2 GHz之雙頻帶通濾波器。量測結果顯示在2.47 GHz時的植入損失為1.7 dB，反射損失為17 dB，而在5.2 GHz時的植入損失為2.1 dB，反射損失為20 dB，四個零點分別座落於1.6 GHz、3.8 GHz、5.8 GHz與8 GHz。

This thesis investigates a novel reconfigurable bandpass/bandstop filter and a heterogeneous-resonator-interleaved dual-band bandpass filter. First, the reconfiguration of bandpass and bandstop response is achieved by tuning the series-resonated perturbation extent to control the even and odd mode splitting. Two design issues must be addressed, including the alignment of central frequencies and the impedance match at both bandpass and bandstop modes. The theory and design methodology of the reconfigurability are described and an experimental filter is designed for demonstration. The measured bandpass response has an insertion loss of 1.6 dB, return loss better than 20 dB at 2.4 GHz. The bandstop response has greater than 20-dB rejection from 2.38 GHz to 2.8 GHz. Second, a novel dual-band bandpass filter is proposed by interleaving heterogeneous types of stepped-impedance resonators (SIR), where each type has its own resonant frequency and is different from each other. At the first passband, the first SIR is resonant and the other SIR is working as an input/output feeding network. At the second passband, the second SIR is resonating while the first SIR acts as an inter-coupling element between the resonating SIRs. A demonstrated circuit was designed for passbands at 2.4 GHz and 5.2 GHz. The measured insertion losses are less than 1.2 dB at 2.47 GHz and 2.1 dB at 5.2GHz, respectively. The return losses are greater than 17 dB and 20 dB at both bands, and four transmission zeros located at 1.6 GHz, 3.8 GHz, 5.8 GHz and 8 GHz, respectively.

目錄 I
表目錄 III
圖目錄 IV
第一章 緒論 1
1.1. 研究動機 1
1.2. 論文內容綱要 2
第二章 可變型態之環型帶通與帶拒濾波器之設計 3
2.1. 雙模態環型濾波器之介紹 3
2.2. 可變型態之環形帶通與帶拒濾波器之理論與分析 7
2.2.1. 可變型態之環型帶通與帶拒濾波器之分析 9
2.2.2. 中心頻率矯正機制 12
2.2.3. 可變型態之環型帶通與帶拒濾波器之整理 15
2.3. 可變型態之環型帶通與帶拒濾波器之設計步驟 16
2.4. 電路模擬與量測結果 18
2.5. 量測結果討論與結論 22
第三章 交錯式異頻共振器之雙頻帶通濾波器之設計 23
3.1. 步階阻抗共振器之介紹 23
3.2. 交錯式異頻共振器雙頻帶通濾波器之理論與分析 26
3.2.1. 交錯式異頻共振器雙頻帶通濾波器之共振條件分析 27
3.2.2. 交錯式異頻共振器雙頻帶通濾波器之零點分析 29
3.3. 交錯式異頻共振器雙頻帶通濾波器之設計步驟 39
3.4. 電路模擬與量測結果 42
3.5. 量測結果討論 43
第四章 結論 45
參考文獻 46

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