臺灣博碩士論文加值系統

本論文在探討以環形共振器來設計平衡式帶通濾波器，首先我們探討平衡式帶通濾波器之基本原理、環形共振器及步階式阻抗共振器(SIR)之特性、耦合共振器的耦合係數等，作為本研究之理論基礎。
本研究所設計之第一個電路為一新的二階平衡式帶通濾波器，其主結構由兩個環形共振器所組成。為了獲得所需之差模響應(differential-mode response)和抑制共模訊號傳輸，我們將兩個環形共振器設計成具有相同之奇模態、但不同之耦模態共振頻率。如此，在差模操作時，由於兩環形共振器之共振頻率相同，故可獲得所要之通帶響應；而共模操作時，由於兩者之共振頻率錯開，共模訊號將被有效衰減。共模頻率錯開之機制，主要藉由在其中之一環形共振器中央加載T-型殘段來達成。
本論文所設計之第二個電路為一以兩個步階式阻抗環形共振器(stepped-impedance ring resonators, SIRRs)組成之平衡式雙頻帶通濾波器。基於實用之考量，兩通帶之中心頻率設計為無線區域網路通訊(wireless local-area network, WLAN)之2.45 GHz與5.25 GHz。同理，為了獲得所需之差模響應和抑制共模訊號之傳輸，我們將兩個SIRRs設計成具有相同之奇模態、但不同之偶模態共振頻率。而其共模頻率錯開之機制，主要亦藉由在其中之一SIRR中央加載開路殘段來達成。
本研究所設計之平衡式帶通濾波器，其模擬與實測結果皆相當吻合。由所得之結果顯示，所設計之單頻與雙頻平衡式帶通濾波器其差模通帶插入損失之理論值皆不大於2 dB，而共模之插入損失在1-8 GHz頻率範圍內皆小於20 dB，故知所設計之平衡式帶通濾波器有良好的差模響應和高的共模雜訊抑制能力。

In this thesis, balanced bandpass filters (BPFs) design using ring resonators were studied. The operating characteristics of ring resonators and the whole balanced BPFs were analyzed, which would serve as the mathematical and theoretical bases of this research.
The first balanced BPF examined in this thesis is a single-band one that uses two uniform ring resonators as its key resonant elements. To obtain the required differential-mode (DM) operation and common-mode (CM) suppression, the two ring resonators are designed to have the same odd-mode but different even-mode resonant frequencies. The separation of the even-mode resonant frequencies of the two resonators in CM operation results from loading at the center of one of the ring resonators a T-shape open stub.
In the second balanced filter design, a second-order dualband BPF using two stepped-impedance ring resonators (SIRRs) is proposed. For practical application consideration, the two passbands are designed at the WLAN 2.45-GHz and 5.25-GHz bands. Similarly, the two SSIRs are designed to have the same odd-mode but different even-mode resonant frequencies to obtain the designated DM operation and to reject CM signals. Separation of the even-mode resonant frequencies of the two SIRRs in CM operation can also be achieved by loading at the center of one of the SIRR an open stub to make the electric length longer.
Prototype circuits of the proposed balanced BPFs are fabricated and measured. Good performances were observed and the simulated and measured results are seen to agree very well with each other. Results show that the minimum insertion loss is less than 2 dB in the passband(s) when operated differentially and 22 dB for CM operation within 1 - 8 GHz frequency range for both of the proposed single-band and dualband balanced BPFs.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 v
第一章
緒論 1
1-1 研究動機 1
1-2 文獻探討 1
1-3 論文大綱 3
第二章
使用環形共振器之平衡式帶通濾波器設計理論 4
2-1 環形共振器之工作原理 4
2-2 平衡式濾波器之工作原理 5
2-3 共振器耦合結構之探討 6
第三章
以環形共振器設計之平衡式帶通濾波器 9
3-1 二階平衡式帶通濾波器之結構與設計 9
3-2 二階平衡式帶通濾波器模擬與量測結果 11
第四章 以步階式阻抗環形共振器設計之平衡式雙頻帶通濾波器 16
4-1 二階平衡式雙頻帶通濾波器之結構與設計 16
4-2 二階平衡式雙頻帶通濾波器模擬與量測結果 18
第五章
結論 25
參考文獻 26
作者簡歷 29


圖目錄
頁次
圖2.1 環形共振器的共振模態 7
圖2.2 四埠網路之方塊圖 7
圖2.3 三種耦合共振器結構之示意圖 8
圖3.1 二階平衡式帶通濾波器結構圖 12
圖3.2 操作於差模及共模時之等效半電路 13
圖3.3 平衡式帶通濾波器模擬與量測結果之(a)差模頻率響應及(b)共模頻率響應 14
圖3.4 平衡式帶通濾波器實作之照片 15
圖4.1 以步階式阻抗環形共振器設計之二階平衡式雙頻帶通濾波器結構 20
圖4.2 二階平衡式雙頻帶通濾波器操作於差模及共模時之等效半電路 21
圖4.3 步階式阻抗環形共振器之(a)差模與(b)共模時之等效半電路的電場分佈示意圖 22
圖4.4 平衡式雙頻帶通濾波器之頻率響應模擬與量測結果，(a)差模及(b)共模頻率響應 23
圖4.5 平衡式雙頻帶通濾波器之實作電路照片 24

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