臺灣博碩士論文加值系統

利用步階阻抗型諧振器來設計雙工器，將具有可調整諧波頻率之優點。此外，缺陷接地面結構可用以抑制諧波，以改善雙工器之性能，並且進一步縮小電路之尺寸。於本論文中，我們將利用步階阻抗型諧振器與缺陷接地面結構來設計具諧波抑制之2.4/5.2-GHz步階阻抗型雙工器。

於本論文中，首先，探討步階阻抗型雙工器之設計理論。其次，探討缺陷接地面結構對微帶線特性之影響，並利用缺陷接地面結構來抑制諧波。最後，分別設計與製作基本與微小步階阻抗型雙工器，並量測其特性。

由分析結果得知，利用步階阻抗型諧振器來設計雙工器，兩種雙工器皆具有極佳之特性。另一方面，利用缺陷接地面結構來設計雙工器與抑制諧波，除了大約可縮小20.5%之電路尺寸外，並且可將諧波抑制在-20dB以下，以改善雙工器之性能。

The diplexer using stepped-impedance resonators can control its spurious frequency. Moreover, the defected ground structures not only can suppress the spurious and improve the performance of the diplexer, but also can further reduce the size of the circuit. In this thesis, the stepped-impedance resonators and the defected ground structures are used to design the 2.4/5.2-GHz stepped-impedance diplexers with spurious suppression.

In this thesis, the theory of the design of diplexer using stepped-impedance resonators is analyzed firstly. Next, the influence of the defected ground structures on the spurious suppression and the frequency response of the microstrip lines are studied. Finally, the basic and miniaturized diplexers are designed and realized, respectively. In addition, the characteristics of these diplexers are measured.

From the analyzed results, it is noted that both two diplexers designed by the stepped-impedance resonators have good performance. On the other hand, the diplexer designed with defected ground structure not only can reduce the size of the circuit about 20.5%, but also can suppress the spurious below -20dB to improve the performance.

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 步階阻抗型雙工器之理論分析…………………………4
2-1 簡介………………………………………………………4
2-2 低通濾波器之原型電路…………………………………4
2-3 步階阻抗型帶通濾波器…………………………………5
2-4 步階阻抗型雙工器………………………………………9
2-5 具缺陷接地面結構之微帶線……………………………11
2-6 諧波之抑制………………………………………………15
第三章 步階阻抗型雙工器之設計………………………………33
3-1 簡介………………………………………………………33
3-2 基本步階阻抗型帶通濾波器……………………………33
3-2.1 2.4GHz帶通濾波器……………………………33
3-2.2 5.2GHz帶通濾波器……………………………38
3-3 基本步階阻抗型雙工器…………………………………40
3-4 微小步階阻抗型帶通濾波器……………………………43
3-4.1 2.4GHz帶通濾波器……………………………43
3-4.2 5.2GHz帶通濾波器……………………………45
3-5 微小步階阻抗型雙工器…………………………………46
第四章 步階阻抗型雙工器之特性量測…………………………65
4-1 簡介………………………………………………………65
4-2 電路佈局與製作…………………………………………65
4-3 基本步階阻抗型雙工器之特性…………………………66
4-4 微小步階阻抗型雙工器之特性…………………………67
4-5 結果與討論………………………………………………68
第五章 結論………………………………………………………87
參考文獻……………………………………………………………89

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