本論文提出了不同的電路分析過程來解釋X. Y. Zhang 等人提出利用鑑別耦合方法設計之濾波器架構，利用Sato 網路分析推得其濾波器架構之等效電路，藉此得到產生傳輸零點的原因，並且針對其鑑別耦合濾波器架構提出了耦合線具不對稱負載電路，藉此增加濾波器設計傳輸零點時的自由度，並且推導了不同邊界條件下耦合線具不對稱負載產生傳輸零點的條件，以及整理了設計濾波器電路的步驟，最後以電磁模擬來驗證理論之正確性與實用性。本論文亦討論了John B. Nass 所提出透過觀察電路輸入反射群延遲來微調諧振器耦合濾波器的方法，並探討電路在微帶線架構實現時，在觀察輸入端反射群延遲時所產生的問題以及微調電路的方法。

In this thesis, we studied the harmonic-suppressed bandpass filter is based on discriminating coupling proposed by X. Y. Zheng and Q. Xue. Discriminating coupling is used to obtain zero coupling coefficient at high order harmonic. Then we provides a different way of deriving the equivalent circuit of the discriminating coupling structure by using Sato’s network model of coupled transmission lines. To increase the freedom of filter design we analysis of four types of coupled-line structures: coupled lines with load at one end. The equation for the transmission zero of coupled lines with load at one end has been derived from its network model. Based on this equation, coupled lines with different loads at one end are analyzed and the rules for controlling the transmission-zero frequency are given. Finally, two case of band-pass filters are designed, and verify the practicability through EM simulation.The last part of this thesis we studied the tuning method of coupled-resonator filters by John B. Ness. Furthermore, we discuss the problem of tuning band-pass filter network fabricated on microstrip line structures.

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[1.2] C. F. Chen, T. Y. Huang, and R. B. Wu, “Design of microstrip bandpass filters with multiorder spurious-mode suppression,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 12, pp. 3788–3793, Dec. 2005.

[1.3] S. C. Lin, P. H. Deng, Y. S. Lin, C. H. Wang, and C. H. Chen, “Widestopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 3, pp. 1011–1018, Mar. 2006.

[1.4] Y. C. Chiou, J. T. Kuo, and E. Cheng, “Broadband quasichebyshev bandpass filters with multimode stepped-impedance resonators (SIRs),” IEEE Trans. Microw. Theory Tech., vol. 54, no. 8, pp. 3352–3358, Aug. 2006.

[1.5] J. Garcia-Garcia, J. Bonache, and F. Martin, “Application of electromagnetic bandgaps to the design of ultra-wide bandpass filters with good out-of-band performance,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 12, pp. 4136–4140, Dec. 2006.

[1.6] J.-T. Kuo, M. Jiang, and H.-J. Chang, “Design of parallel-coupled microstrip filters with suppression of spurious resonances using substrate suspension,” IEEE Trans. Microw. Theory Tech., vol. 52, no. 1, pp. 83–89, Jan. 2004.

[1.7] C. M. Tsai, S. Y. Lee, and H. M. Lee, “Transmission-line filters with capacitively loaded coupled lines”, IEEE Trans. Microw. Theory Tech., vol. 51, no. 15, May 2003.

[1.8] Q. X. Chu and H. Wang, “A compact open-loop filter with mixed electric and magnetic coupling,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 2, pp. 431-439, Feb. 2008.

[1.9] X. Y. Zhang, “Harmonic-suppressed bandpass filter based on discriminating coupling,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 11, pp. 695-697, Nov. 2009.

[1.10] R. Sato and E. Cristal, “Simplified analysis of coupled transmission-line networks,” IEEE Trans. Microw. Theory Tech., vol. 18, no.3, pp. 122-131, Mar. 1970.

[1.11] J. B. Ness, “A unified approach to the design, measurement, and tuning of coupled-resonator filters,” IEEE Trans. Microw. Theory Tech., vol. 46, no. 4, pp. 343-351, Apr. 1998.

[1.12] M. Makimoto and S.Yamashita, “Bandpass filters using parallel coupled stripline stepped impedance resonators,” IEEE Trans. Microw. Theory Tech., vol. 28, no. 12, pp. 1413–1417, Dec. 1980.

[1.13] Y. C. Li, X. Y. Zhang, and Q. Xue, “Bandpass filter using discriminating coupling for extended out-of-band suppression,” IEEE Microw. Wireless Compon. Lett., vol.20, no. 7, pp. 369-371, July 2010.

[1.14] G. I. Zysman and A. K. Johnson, “Coupled transmission line networks in an inhomogeneous dielectric medium,” IEEE Trans. Microw. Theory Tech., vol. 17, no. 10, pp. 753–759, Oct. 1969.

[2.1] C. F. Chen, T. Y. Huang, and R. B. Wu, “Design of microstrip bandpass filters with multiorder spurious-mode suppression,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 12, pp. 3788–3793, Dec. 2005.

[2.2] S. C. Lin, P. H. Deng, Y. S. Lin, C. H. Wang, and C. H. Chen, “Widestopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 3, pp. 1011–1018, Mar. 2006.

[2.3] Y. C. Chiou, J. T. Kuo, and E. Cheng, “Broadband quasichebyshev bandpass filters with multimode stepped-impedance resonators (SIRs),” IEEE Trans. Microw. Theory Tech., vol. 54, no. 8, pp. 3352–3358, Aug. 2006.

[2.4] M. Makimoto and S.Yamashita, “Bandpass filters using parallel coupled stripline stepped impedance resonators,” IEEE Trans. Microw. Theory Tech., vol. 28, no. 12, pp. 1413–1417, Dec. 1980.

[2.5] C. M. Tsai, S. Y. Lee, and H. M. Lee, “Transmission-line filters with capacitively loaded coupled lines”, IEEE Trans. Microw. Theory Tech., vol. 51, no. 15, May 2003.

[2.6] Q. X. Chu and H. Wang, “A compact open-loop filter with mixed electric and magnetic coupling,” IEEE Trans. Microw. Theory Tech., Vol. 56, No. 2, pp. 431-439, Feb. 2008.

[2.7] X. Y. Zhang, “Harmonic-suppressed bandpass filter based on discriminating coupling,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 11, pp. 695-697, Nov. 2009.

[2.8] J. S. Hong and M. J. Lancaster, Microwave Filter for RF/Microwave Application. New York: Wiley, 2001, pp. 244–245.

[2.9] Awai, I. and Y. Zhang, “Coupling coefficient of resonators-an intuitive way of its understanding,” Electronics and Communications in Japan, vol. 90, no. 9, Part 2, 11–18, Dec. 2007.

[2.10] Seymour B. Cohn, “Direct-coupled-resonator filter.” Proc. IRE, pp. 187-196, Feb. 1957.

[2.11] C. M. Tsai and H. M. Lee, “Improved coupled-microstrip filter design using effective even-mode and odd-mode characteristic impedances”, IEEE Trans. Microw. Theory Tech., vol. 53, no. 9, pp. 2812-2818, Sept. 2005.

[3.1] X. Y. Zhang, “Harmonic-suppressed bandpass filter based on discriminating coupling,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 11, pp. 695-697, Nov. 2009.

[3.2] I. Awai and Y. Zhang, “Coupling coefficient of resonators-an intuitive way of its understanding,” Electronics and Communications in Japan, vol. 90, no. 9, part 2, 11-18, 2007.

[3.3] R. Sato and E. Cristal, “Simplified analysis of coupled transmission-line networks,” IEEE Trans. Microw. Theory Tech., vol. 18, no.3, pp. 122-131, Mar. 1970.

[3.4] Y. C. Li, X. Y. Zhang, and Q. Xue, “Bandpass filter using discriminating coupling for extended out-of-band suppression,” IEEE Microw. Wireless Compon. Lett., vol.20, no. 7, pp. 369-371, July 2010.

[3.5] G. I. Zysman and A. K. Johnson, “Coupled transmission line networks in an inhomogeneous dielectric medium,” IEEE Trans. Microw. Theory Tech., vol. 17, no. 10, pp. 753–759, Oct. 1969.

[3.6] J. B. Ness, “A unified approach to the design, measurement, and tuning of coupled-resonator filters,” IEEE Trans. Microw. Theory Tech., vol. 46, no. 4, pp. 343-351, Apr. 1998.

[4.1] Y. C. Li, X. Y. Zhang, and Q. Xue, “Bandpass filter using discriminating coupling for extended out-of-band suppression,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 7, pp. 369-371, July 2010.

[4.2] G. I. Zysman and A. K. Johnson, “Coupled transmission line networks in an inhomogeneous dielectric medium,” IEEE Trans. Microw. Theory Tech., vol. 17, no. 10, pp. 753–759, Oct. 1969.

[4.3] J. B. Ness, “A unified approach to the design, measurement, and tuning of coupled-resonator filters,” IEEE Trans. Microw. Theory Tech., vol. 46, no. 4, pp. 343-351, Apr. 1998.