臺灣博碩士論文加值系統

本文提出一個新型雙通帶濾波器的設計，單一級電路包含兩個電路並聯，其一是四分之一波長的耦合線串聯四分之一波長的傳輸線，其二是其串聯反向電路。將多個單一級電路直接串接即可得到多級電路，不僅增進通帶頻率的選擇度，也增加截止帶的衰減量。本文所提出的電路，在兩通帶之兩側以及截止頻帶中有多個傳輸零點。本文以傳輸線理論分析單一級電路，並提供一級與二級電路雙通帶響應的相關設計圖。在實作方面，將指叉式電容加入耦合線的兩端，補償奇偶模波速不相等的問題，藉以改善截止頻帶中的抑制量。本文提供四個實作電路的模擬與量測比較，以驗證此設計。

A new circuit structure is proposed for design of dual-band bandpass filters. A one-stage circuit consists of two two-port networks in shunt connection; one is a coupled-line section of λ/4 long followed by a transmission line segment of identical length, and the other has the same elements but cascaded in reverse order, where λ/4 is the wavelength at arithmetic mean frequency of the two passbands. Higher-orders circuits can be obtained by directly cascading two or more such stages and show improved frequency selectivity. In addition to on both sides of the passbands, transmission zeros are also created in the rejection bands. Analysis of the one-stage circuit is formulated by the transmission line theory and design curves for one- and two-stage circuits are provided. In realization, interdigital capacitors are incorporated with the λ/4 coupled sections for compensating the effect of unequal modal phase velocities on the filter performance in the rejection band. Two circuits are fabricated and measured to validate the idea.

中文摘要.............................................. i
英文摘要.............................................. ii
致謝.................................................. iii
目錄.................................................. iv
表目錄................................................ v
圖目錄................................................ vi
第一章 簡介......................................... 1
第二章 雙通帶濾波器設計電路架構與分析............... 4
2-1平行耦合級傳輸之網路參數.................. 4
2-2濾波器電路分析............................ 9
2-3雙頻帶[S]參數頻率響應與其零點位置......... 13
2-4多級電路.................................. 17
第三章 模擬與實作電路量測.......................... 28
3-1耦合微帶線奇偶模波速之補償................ 28
3-2電路實作與量測結果........................ 31
第四章 結論........................................ 42
參考文獻..................................... 43

[1] J.-T. Kuo and H.-S. Cheng, “Design of quasi-elliptic function filters with a dual-passband response,” IEEE Microw. Wireless Compon. Lett., vol. 14, no. 10, pp. 472-474, Oct. 2004.
[2] J.-T. Kuo, T.-H. Yeh and C.-C. Yeh, “Design of microstrip bandpass filters with a dual-passband response,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 11, pp. 1331-1337, Apr. 2005.
[3] J.-T. Kuo and H.-P. Lin, “Dual-band bandpass filter with improved performance in extended upper rejection band,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 4, pp. 824-829, Apr. 2009.
[4] Sheng Sun and Lei Zhu, “Compact dual-band microstrip bandpass filter without external feeds,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 10, pp. 644–646, Oct. 2005.
[5] Chu-Yu Chen, Cheng-Ying Hsu and Huey-Ru Chuang, “Design of miniature planar dual-band filter using dual-feeding structures and embedded resonators,” IEEE Microw. Wireless Compon. Lett., vol. 16, no. 12, pp. 669–671, Dec. 2006.
[6] Qing-Xin Chu and Fu-Chang Chen, “A compact dual-band bandpass filter using meandering stepped impedance resonators,” IEEE Microw. Wireless Compon. Lett., vol. 18, no. 5, pp. 320–322, May 2008.
[7] P. Mondal and M. K. Mondal, “Design of dual-band bandpass filters using stub-loaded open-loop resonators,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 1, pp. 150–154, Jan. 2008.
[8] X.-Y. Zhang, J.-X. Cheng, Q. Xue and S. M. Li, “Dual-band bandpass filters using stub-loaded resonators,” IEEE Microw. Wireless Compon. Lett., vol. 17, no. 8, pp. 583–585, Aug. 2007.
[9] Q.-X. Chu, F.-C. Chen, Z.-H. Tu and H. Wang, “A novel crossed resonator and its applications to bandpass filters,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 7, pp. 1753-1759, Jul. 2009.
[10] J.-X. Chen, T.-Y. Yum, J.-L. Li and Q. Xue, “Dual-mode dual-band bandpass filter using stacked-loop structure,” IEEE Microw. Wireless Compon. Lett., vol. 16, no. 9, pp. 502-504, Sep. 2006.
[11] X. Y. Zhang and Q. Xue, “Novel dual-mode dual-band filters using coplanar-waveguide-fed ring resonators,” IEEE Trans. Microw. Theory Tech., vol. 55, no. 10, pp. 2183-2190, Oct. 2007.
[12] Y.-C. Chiou, C.-Y. Wu and J.-T. Kuo, “New miniaturized dual-mode dual-band ring resonator bandpass filter with microwave C-sections,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 2, pp. 67-69, Feb. 2010.
[13] C. Lugo and J. Papapolymerou, “Multilayer dual-band filter using a reflector cavity and dual-mode resonators,” IEEE Microw. Wireless Compon. Lett., vol. 17, no. 9, pp. 637-639, Sep. 2007.
[14] T.-W. Lin, U-H. Lok and J.-T. Kuo, “New dual-mode dual-band bandpass filter with quasi-elliptic function passbands and controllable bandwidths,” in IEEE MTT-S Int. Dig., Jun. 2010, pp. 576 – 579.
[15] C.-M. Tsai, H.-M. Lee and C.-C. Tsai, “Planar filter design with fully controllable second passband,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 11, pp. 3429-3439, Nov. 2005.
[16] H.-M. Lee and C.-M. Tsai, “Dual-band filter design with flexible passband and bandwidth selections,” IEEE Trans. Microw. Theory Tech., vol. 55, no. 5, pp. 1002-1009, May 2007.
[17] A.-S. Liu, T.-Y. Huang, and R.-B. Wu, “A dual wideband filter design using frequency mapping and stepped-impedance resonators,” IEEE Trans. Microw. Theory Tech., vol.
56, no. 12, pp. 2921-2929, Dec. 2008.
[18] X. Guan, Z. Ma, P. Cai, Y. Kobayashi, T. Anada, and G. Hagiwara, “Synthesis of dual-band bandpass filters using successive frequency transformations and circuit conversions,” IEEE Microw. Wireless Compon. Lett., vol. 16, no. 3, pp. 110–112, Mar. 2006.
[19] J. Lee and K. Sarabandi, "A synthesis method for dual-passband microwave filters," IEEE Trans. Microw. Theory Tech., pp. 1163 – 1170, Jun. 2007.
[20] A. G. Lamperez, “Analytical synthesis algorithm of dual-band filters with asymmetric pass bands and generalized topology,” in IEEE MTT-S Int. Dig., Jun. 2007, pp. 909 – 912.
[21] M. Sanchez-Renedo and R. Gomez-Garcıa, “Microwave dual-band bandpass planar filter using double-coupled resonating feeding sections,” in Proc. EuMC, 2009, pp. 101 – 104.
[22] David M. Pozar, Microwave Engineering, 3rd ed. New York : Wiley, 2005
[23] K.-S. Chin and J.-T. Kuo, “Insertion loss function synthesis of maximally flat parallel-coupled line bandpass filters,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 10, pp. 3161 – 3168, Oct. 2005.
[24] http://mathworld.wolfram.com/CubicFormula.html
[25] M. Dydyk, “Accurate design of microstrip directional couplers with capacitive compensation,” in IEEE MTT-S Int. Dig., 1990, pp. 581 – 584.
[26] G. D. Alley, “Interdigital capacitors and their application to lumped-element microwave integrated circuits,” IEEE Trans. Microw. Theory Tech., vol. 18, no. 12, pp. 1028 – 1033, Dec. 1970.
[27] J.-S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001.
[28] IE3D Simulator, Zeland Software Inc., Jan. 1997.