臺灣博碩士論文加值系統

利用截線負載型步階阻抗諧振器來設計三波段帶通濾波器，將具有可控制諧波頻率與較小電路尺寸之優點。於本論文中，我們將利用截線負載型步階阻抗諧振器來設計2.4/3.7/5.2-GHz之三波段帶通濾波器。

於本論文中，首先，探討截線負載型步階阻抗諧振器之特性。其次，探討具截線負載型步階阻抗諧振器的三波段帶通濾波器之設計理論。接著，分別設計及製作具電耦合與混合耦合結構的截線負載型步階阻抗諧振器之三波段帶通濾波器。最後，分別量測兩種三波段帶通濾波器之電路特性，並將量測結果與模擬數值作比較。

由研究結果得知，兩種三波段帶通濾波器皆具有極佳之濾波特性。其中，具混合耦合結構的截線負載型步階阻抗諧振器之三波段帶通濾波器，於通帶區內有較佳之最小折返損失。另一方面，具電耦合結構的截線負載型步階阻抗諧振器之三波段帶通濾波器，除了於截止區內具有三個傳輸零點外，並且可以較具混合耦合結構的截線負載型步階阻抗諧振器之三波段帶通濾波器縮小大約16%之電路尺寸。

The design of the tri-band bandpass filter using the stub-loaded stepped-impedance resonators will have several advantages, such as the controllable resonant frequency and the compact size. In this thesis, the stub-loaded stepped-impedance resonators are used to design the 2.4/3.7/5.2-GHz tri-band bandpass filters.

In this thesis, the characteristic of the stub-loaded stepped-impedance resonators will be analyzed firstly. Next, the theory of the design of tri-band bandpass filter using stub-loaded stepped-impedance resonators is studied. Moreover, the tri-band bandpass filters with electric-coupled and mixed-coupled stub-loaded stepped-impedance resonators are designed and realized, respectively. Finally, the characteristics of the two tri-band bandpass filters are measured and compared with the simulation results.

From the research results, it is found that both tri-band bandpass filters have good performance. In the passband, the tri-band bandpass filter with mixed-coupled stub-loaded stepped-impedance resonators has the better return loss. Furthermore, the tri-band bandpass filter with electric-coupled stub-loaded stepped-impedance resonators not only has three transmission zeros in the stopband, but also the size can be reduced about 16% as compared with the tri-band bandpass filter with mixed-coupled stub-loaded stepped-impedance resonators.

摘要Ⅰ
AbstractⅡ
目次Ⅲ
圖次Ⅴ
表次Ⅶ
第一章 緒論1
1-1 研究動機1
1-2 文獻探討2
1-3 內容概要3
第二章 具截線負載型步階阻抗諧振器之三波段帶通濾波器4
2-1 簡介4
2-2 低通濾波器之原型電路4
2-3 截線負載型步階阻抗諧振器6
2-4 具電耦合結構之三波段帶通濾波器9
2-4.1 諧振器之設計10
2-4.2 諧振器間之耦合係數10
2-5 具混合耦合結構之三波段帶通濾波器11
2-5.1 諧振器之設計12
2-5.2 諧振器間之耦合係數12
第三章 三波段帶通濾波器之設計23
3-1 簡介23
3-2 直線型之截線負載型步階阻抗諧振器23
3-3 具電耦合結構之三波段帶通濾波器25
3-3.1 彎折型諧振器之設計25
3-3.2 各參數值之影響27
3-3.3 電路設計30
3-4 具混合耦合結構之三波段帶通濾波器34
3-4.1 彎折型諧振器之設計34
3-4.2 各參數值之影響35
3-4.3 電路設計37
3-5 模擬特性之比較40
第四章 三波段帶通濾波器之製作與量測70
4-1 簡介70
4-2 電路佈局與製作70
4-3 具電耦合結構之三波段帶通濾波器70
4-4 具混合耦合結構之三波段帶通濾波器71
4-5 結果與討論72
第五章 結論80
參考文獻82

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