共面波導帶通濾波器之研製

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陳垠志(Yin-chih Chen) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

共面波導帶通濾波器之研製
(CPW Bandpass Filters)

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摘要(中)

本論文提出一個新式帶通濾波器架構，並使用共平面波導傳輸線來實現，其結構的組成為於阻抗及納導轉換子之間加入傳輸線共振器交錯串接。其中傳輸線共振器結構由一段傳輸線串聯一短路傳輸線所組成，而短路傳輸線可置於共面波導訊號線裡，使傳輸線共振器長度縮小。相較於傳統以四分之一波長傳輸線共振器設計的帶通濾波器，共振器長度可縮小約一半，而與傳統步階式阻抗共振器相比，則可藉由共振器本身的傳輸零點來抑制旁生通帶將止帶上限往高頻提升。針對此新式濾波器，提出對應的等效電路與設計公式，以便利於設計。論文中以共面波導實作四階的帶通濾波器，中心頻率為2GHz，植入損耗在1.66~2.34GHz小於2dB（比例頻寬34%），30dB止帶頻率上限可達四倍中心頻率，全波模擬與量測結果亦有相當好的吻合度。

摘要(英)

In this study, a novel bandpass filter structure is proposed and realized using the coplanar waveguide (CPW) structure. The filter is based on the alternate connection of proposed resonator, impedance inverter, and admittance inverter. The proposed resonator consists of a transmission line and a short-end series stub. The short-end series stub can be patterned inside the center conductor of CPW and thus reduces size of resonator. As a result, the length of the proposed transmission-line can be reduced to less than half that of the conventional uniform quarter-wave transmission line resonator. Spurious responses are suppressed using the inherent transmission zero and thus increase the stopband bandwidth. This is an advantage of proposed filter over the conventional stepped-impedance filter. Specifically, fourth-order CPW bandpass filters are designed at 2GHz and the insertion loss is less than 2 dB between 1.66 and 2.34 GHz. Spurious suppression is better than 30dB up to four times the center frequency. The measurement results agree well with the simulation results.

關鍵字(中)

★ 導納反轉子
★ 共面波導帶通濾波器
★ 阻抗反轉子

關鍵字(英)

★ admittance inverter
★ impedance inverter
★ CPW bandpass filter

論文目次

摘要 Ⅰ
Abstract Ⅱ
致謝 Ⅲ
圖目錄 Ⅴ
表目錄 Ⅷ
第一章　　簡介
1-1　研究動機.............................................1
1-2　文獻回顧.............................................1
1-3　章節介紹.............................................3
第二章　　新式帶通濾波器架構
序論......................................................4
2-1　濾波器原型電路
2-1-1　植入損耗函數法設計濾波器......................4
2-1-2　阻抗與導納轉換子..............................4
2-1-3　新式帶通濾波器原型電路........................6
2-2　新式帶通濾波器設計..................................15
第三章　　共面波導帶通濾波器設計
序論.....................................................21
3-1　修正後新式帶通濾波器設計............................21
3-2　濾波器特性分析......................................31
3-3　實作及電路特性分析..................................39
第四章　　結論.....................................................60
參考文獻...........................................................61
附錄...............................................................63

參考文獻

[1] G. L. Matthaei, “Direct-coupled-band-pass filters with resonators,” 1958 IRE National Convention Record, Part 1, pp. 98-111.
[2] C. P. Wen, “Coplanar waveguide: A surface strip transmission line suitable for nonreciprocal gyromagnetic device application,＂ IEEE Transactions on Microwave Theory and Techniques, vol. 17, pp. 1087- 1090, December 1969.
[3] A. Sanada, H. Takehara, T. Yamamoto, and I. Awai, “ stepped-impedance resonator bandpass filters fabricated on coplanar waveguide,” IEEE MTT-S Int. Microwave Symp. Dig., pp. 385-388, 2002.
[4] K. Hettak, N. Dib, A. F. Sheta, and S. Toutain, “A class of novel uniplanar series resonators and their implementation in original applications,” IEEE Trans. Microwave Theory Tech., vol. 46, pp. 1270-1276, Sept. 1998.
[5] Y. K. Kuo, C. H. Wang, and C. H. Chen, “Novel reduced-size coplanar-waveguide bandpass filters,” IEEE Microwave Wireless Comp. Lett., vol. 11, pp. 65-67, Feb. 2001.
[6] T. Tsujiguchi, H. Matsumoto, and T. Nishikawa, “A miniaturized double-surface CPW bandpass filter improved spurious responses,” IEEE Trans. Microwave Theory Tech., vol. 49, pp. 879-885, May. 2001.
[7] D. M. Pozar, Microwave Engineering, New York: Wiley, 3-rd ed, 2005.
[8] J.S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001.
[9] S. B. Cohn, “Direct-coupled-resonator filters,” Proc. IRE, vol. 45, pp. 187-196, February 1957.
[10] G. Matthaei, L. Young, and EMT Jones, Microwave Filters, Impedance-matching Networks, and Coupling Structures, New York: McGraw-Hill, 1964.
[11] K. Hettak, N. I. Dib, A. Omar, G.-Y. Delisle, M. Stubbs, and S. Toutain, “A useful new class of miniature CPW shunt stubs and its impact on millimeter-wave integrated circuits,” IEEE Trans. Microwave Theory Tech., vol. 47, No. 12, pp. 2340-2349, Dec. 1999.
[12] R. N. Simons, Coplanar Waveguide Circuits, Components, and Systems, New York: John Wiley & Sons, 2001.

指導教授

林祐生(Yo-Shen Lin)

審核日期

2007-7-16

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