Design and Research of Coupled Line Filter 林枝伸、吳俊德

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Design and Research of Coupled Line Filter 林枝伸、吳俊德

E-mail: 9510968@mail.dyu.edu.tw

ABSTRACT

In this dissertation, a new parallel-coupled-line microstrip bandpass filter is presented to suppress spurious passband of the second harmonic signal. Furthermore,the desired passband performance is improved by using this filter. The present filter can be easily realized by inserting periodic patterns in the coupled-line combined with the conventional design methodology. A third order chebyshev filter with a centered frequency at 2.5 ghz and a 20% fractional bandwidth (FBW) is used to test the performance of the present structure. Both simulation and experiment show that the present structure suppresses more then 30 db on the second harmonic.

Keywords : PARALLEL-COUPLED-LINE ; design ; FILTER

Table of Contents

第一章 緒論.................. 1 第二章 原理與分析 2.1 濾波器基本理論............

.. 2 2.2 集總式帶通濾波器............. 3 2.3 低通濾波器轉帶通濾波器.......... 6 2.4 濾 波器阻抗轉換.............. 9 2.5 微帶傳輸線................ 11 2.6 偶合線...

............... 15 2.7 一段平行偶合微帶線分析.......... 18 2.8 平行偶合線濾波器設計.

.......... 25 第三章 平行偶合濾波器抑制二階諧波的模擬與實做 3.1 改善濾波器之動機.........

.....33 3.2 濾波器設計.................34 3.3 設計溝槽在平行偶合線濾波器.......

..37 3.4 模擬與量測數值...............38 第四章 結論...................49 參考文獻....................53

REFERENCES

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[7] D. Ahn, J. S. Park, C. S. Kim, J. Kim, Y. Qian, T. Itoh, "A design of low-pass filter using the novel microstrip defected ground structure," IEEE Trans. Microwave Theory Tech., vol. 49, no. I, pp.86-93, January, 2001 [8] T. Lopetegi, M. A. G. Laso, J. Hernandez, M. Bacaicoa, D. Benito, M. I. Garde, M. Sorolla, and M. Guglielmi, "New microship "wiggly-line" filters with spurious passband suppression," IEEE Trans. Microwave Theory Tech., vol. 49, no. 9, pp.1593-1598,2001.

[9] Bong S. Kim, Jae W. Lee, and Myung S. Song〝Modified Microstrip Filters Improving The Suppression Performance of Harmonic Signals

〞Electronics and Telecommunications Research Institute, 161 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, KOREA [10] David M.Pozar,

”Microwave Engineering secondedition John Wiley&Sons,Inc.1988.

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參考文獻

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