• 沒有找到結果。

結論與未來工作

本論文提出之新式的匹配電路架構,使用分支線共振器來實現微

帶雙頻濾波器。可以用簡單的設計流程來實現雙頻濾波器,且濾波器 之兩個頻帶可以分開來單獨設計,因此在外部品質因素Q (external quality factors)也能有彈性的來設計,進而使得兩個頻帶的相對頻寬可 以依照需求來設計,實現了雙頻並且頻帶皆可獨立設計之結構。由於 高頻共振器為嵌入式結構,因此在電路面積上也能維持著小巧的尺 寸。並經由三階柴比雪夫(Chebyshev)雙頻濾波器架構與四階類橢圓 (Quasi-Elliptic)雙頻濾波器架構作完整的驗證,在實際電路量測上也與 電路模擬結果能相互吻合。

在未來工作方面,本電路概念已經實現在三階柴比雪夫雙頻濾波 器架構與四階類橢圓雙頻濾波器架構,然而在兩個頻帶之間皆產生了 不需要的假波響應,因此下一步的研究方向,可以朝抑制假波響應的 方法來加以研究,使濾波器能有更好的響應。

參考文獻

[1] D. M. Pozar, Microwave Engineering, 2nd ed. New York: Wiley, 1998, ch. 8.

[2] H. Miyake, S. Kitazawa, T. Ishizaki, T. Yamada, and Y. Nagatomi, “A miniaturized monolithic dual band filter using ceramic lamination tech- nique for dual mode portable telephones,” in IEEE MTT-S Int. Microw.

Symp. Dig., 1997, vol. 2, pp. 789–792.

[3] J. T. Kuo, T. H. Yeh, and C. C. Yeh “Design of microstrip bandpass filters with a dual-passband response,” IEEE Trans. Microwave Theory Tech., vol. 53, no. 12, pp. 3788-3793, Dec. 2005.

[4] 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, Dec. 2009.

[5] 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.

[6] C. F. Chen, T. Y. Huang, and R. B. Wu, “Design of dual- and triple-passband filters using alternately cascaded multiband resonators,”

IEEE Trans. Microw. Theory Tech., vol. 54, no. 9, pp. 3550-3558, Sep.

2006.

[7] S. Sun and L. Zhu, “Compact dual-band microstrip bandpass filter without external feeds,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 10 pp. 644-646, Oct. 2005.

[8] H. M. Lee, C. R. Chen, C. C. Tsai, C. M. Tsai, “Dual-band coupling and feed structure for microstrip filter design,” in IEEE MTT-S Int. Microw.

Symp. Dig., Jun. 2004, vol. 3, pp. 1971-1974.

[9] S. F. Chang; Y. H. Jeng; and J. L. Chen, “Dual-band step-impedance bandpass filter for multimode wireless LANs,” Electron. Lett., vol. 40, pp. 38-39, Jan. 2004.

[10] Y. P. Zhang and M. Sun, “Dual-Band Microstrip Bandpass Filter Using Stepped-Impedance Resonators With New Coupling Schemes,”

IEEE Trans. Microw. Theory Tech., vol. 54, no. 10, pp. 3779 - 3785, Oct. 2006.

[11] Q. X. Chu and F. C. 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.

[12] A. Djaiz, T.A. Denidni and M. Nedil, “Dual-band filter using multilayer structures and embedded resonators,” Electron. Lett., vol. 43, pp. 527-528, Apr. 2007.

[13] C. Y. Chen, C. Y. 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.

[14] Cheng-Ying Hsu, Chu-Yu Chen, and Huey-Ru Chuang, “Design of microstrip miniature dual-band filter using embedded resonators,” in Asia–Pacific Microwave Conf., 2006, pp. 1811 - 1813.

[15] 九十九年度國科會專題計畫申請書,計畫名稱:利用分支線共振器 設計多頻帶濾波器,計畫編號:99-2221-E-390-007,計劃主持人:

鄧卜華。

[16] P. H. Deng, M. I. Lai, S. K. Jeng, and C. H. Chen, “Design of Matching Circuits for Microstrip Triplexers Based on Stepped-Impedance Resonators,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 12, pp. 4185 - 4192, Dec. 2006.

[17] J. S. Hong and M. J. Lancaster, Microstrip Bandpass Filters for RF/Mi-crowave Applications. New York: Wiley, 2001, ch. 8, pp.

151–155.

[18] J. S. Hong and M. J. Lancaster, “Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters,” IEEE Trans. Microw. Theory Tech., vol. 44, no.11, pp. 2099 - 2109, Nov.

1996.

[19] 翁敏航 (2006)。射頻被動元件設計。台北市:東華。

[20] M. Makimoto and S. Yamashita, “Compact Bandpass Filters Using Stepped Impedance Resonators,” Proc. IEEE, vol67, pp.16-19, 1979.

[22] J. T. Kuo and E. Shih, “Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 5, pp. 1554-1559, May 2003.

相關文件